diff --git a/gcc/testsuite/go.test/test/fixedbugs/bug229.go b/gcc/testsuite/go.test/test/fixedbugs/bug229.go
index 6c9de9ba93e..a70a926da10 100644
--- a/gcc/testsuite/go.test/test/fixedbugs/bug229.go
+++ b/gcc/testsuite/go.test/test/fixedbugs/bug229.go
@@ -12,9 +12,9 @@ func main() {
 	var t testing.T
 	
 	// make sure error mentions that
-	// ch is unexported, not just "ch not found".
+	// name is unexported, not just "name not found".
 
-	t.ch = nil	// ERROR "unexported"
+	t.name = nil	// ERROR "unexported"
 	
 	println(testing.anyLowercaseName("asdf"))	// ERROR "unexported" "undefined: testing.anyLowercaseName"
 }
diff --git a/libgo/MERGE b/libgo/MERGE
index bd71072101b..96fb7f66498 100644
--- a/libgo/MERGE
+++ b/libgo/MERGE
@@ -1,4 +1,4 @@
-82fdc445f2ff
+4a8268927758
 
 The first line of this file holds the Mercurial revision number of the
 last merge done from the master library sources.
diff --git a/libgo/Makefile.am b/libgo/Makefile.am
index 3c34c4b6bcb..348a1cae8d2 100644
--- a/libgo/Makefile.am
+++ b/libgo/Makefile.am
@@ -279,8 +279,7 @@ toolexeclibgoimage_DATA = \
 	image/gif.gox \
 	image/jpeg.gox \
 	image/png.gox \
-	image/tiff.gox \
-	image/ycbcr.gox
+	image/tiff.gox
 
 toolexeclibgoindexdir = $(toolexeclibgodir)/index
 
@@ -586,7 +585,8 @@ go_image_files = \
 	go/image/format.go \
 	go/image/geom.go \
 	go/image/image.go \
-	go/image/names.go
+	go/image/names.go \
+	go/image/ycbcr.go
 
 go_io_files = \
 	go/io/multi.go \
@@ -654,10 +654,15 @@ if LIBGO_IS_LINUX
 go_net_fd_os_file = go/net/fd_linux.go
 go_net_newpollserver_file = go/net/newpollserver.go
 else # !LIBGO_IS_LINUX && !LIBGO_IS_RTEMS
+if LIBGO_IS_NETBSD
+go_net_fd_os_file = go/net/fd_netbsd.go
+go_net_newpollserver_file = go/net/newpollserver.go
+else # !LIBGO_IS_NETBSD && !LIBGO_IS_LINUX && !LIBGO_IS_RTEMS
 # By default use select with pipes.  Most systems should have
 # something better.
 go_net_fd_os_file = go/net/fd_select.go
 go_net_newpollserver_file = go/net/newpollserver.go
+endif # !LIBGO_IS_NETBSD
 endif # !LIBGO_IS_LINUX
 endif # !LIBGO_IS_RTEMS
 
@@ -688,8 +693,12 @@ endif
 if LIBGO_IS_LINUX
 go_net_interface_file = go/net/interface_linux.go
 else
+if LIBGO_IS_NETBSD
+go_net_interface_file = go/net/interface_netbsd.go
+else
 go_net_interface_file = go/net/interface_stub.go
 endif
+endif
 
 go_net_files = \
 	go/net/cgo_unix.go \
@@ -845,6 +854,7 @@ go_strconv_files = \
 	go/strconv/atof.go \
 	go/strconv/atoi.go \
 	go/strconv/decimal.go \
+	go/strconv/extfloat.go \
 	go/strconv/ftoa.go \
 	go/strconv/itoa.go \
 	go/strconv/quote.go
@@ -880,7 +890,8 @@ go_syslog_c_files = \
 go_testing_files = \
 	go/testing/benchmark.go \
 	go/testing/example.go \
-	go/testing/testing.go
+	go/testing/testing.go \
+	go/testing/wrapper.go
 
 go_time_files = \
 	go/time/format.go \
@@ -1197,7 +1208,9 @@ go_go_build_files = \
 go_go_doc_files = \
 	go/go/doc/comment.go \
 	go/go/doc/doc.go \
-	go/go/doc/example.go
+	go/go/doc/example.go \
+	go/go/doc/exports.go \
+	go/go/doc/filter.go
 go_go_parser_files = \
 	go/go/parser/interface.go \
 	go/go/parser/parser.go
@@ -1241,7 +1254,8 @@ go_image_bmp_files = \
 	go/image/bmp/reader.go
 
 go_image_color_files = \
-	go/image/color/color.go
+	go/image/color/color.go \
+	go/image/color/ycbcr.go
 
 go_image_draw_files = \
 	go/image/draw/draw.go
@@ -1266,9 +1280,6 @@ go_image_tiff_files = \
 	go/image/tiff/consts.go \
 	go/image/tiff/reader.go
 
-go_image_ycbcr_files = \
-	go/image/ycbcr/ycbcr.go
-
 go_index_suffixarray_files = \
 	go/index/suffixarray/qsufsort.go \
 	go/index/suffixarray/suffixarray.go
@@ -1318,6 +1329,7 @@ go_net_http_files = \
 	go/net/http/filetransport.go \
 	go/net/http/fs.go \
 	go/net/http/header.go \
+	go/net/http/jar.go \
 	go/net/http/lex.go \
 	go/net/http/request.go \
 	go/net/http/response.go \
@@ -1761,7 +1773,6 @@ libgo_go_objs = \
 	image/jpeg.lo \
 	image/png.lo \
 	image/tiff.lo \
-	image/ycbcr.lo \
 	index/suffixarray.lo \
 	io/ioutil.lo \
 	log/syslog.lo \
@@ -3066,16 +3077,6 @@ image/tiff/check: $(CHECK_DEPS)
 	@$(CHECK)
 .PHONY: image/tiff/check
 
-@go_include@ image/ycbcr.lo.dep
-image/ycbcr.lo.dep: $(go_image_ycbcr_files)
-	$(BUILDDEPS)
-image/ycbcr.lo: $(go_image_ycbcr_files)
-	$(BUILDPACKAGE)
-image/ycbcr/check: $(CHECK_DEPS)
-	@$(MKDIR_P) image/ycbcr
-	@$(CHECK)
-.PHONY: image/ycbcr/check
-
 @go_include@ index/suffixarray.lo.dep
 index/suffixarray.lo.dep: $(go_index_suffixarray_files)
 	$(BUILDDEPS)
@@ -3728,8 +3729,6 @@ image/png.gox: image/png.lo
 	$(BUILDGOX)
 image/tiff.gox: image/tiff.lo
 	$(BUILDGOX)
-image/ycbcr.gox: image/ycbcr.lo
-	$(BUILDGOX)
 
 index/suffixarray.gox: index/suffixarray.lo
 	$(BUILDGOX)
@@ -3938,11 +3937,11 @@ TEST_PACKAGES = \
 	hash/crc32/check \
 	hash/crc64/check \
 	hash/fnv/check \
+	image/color/check \
 	image/draw/check \
 	image/jpeg/check \
 	image/png/check \
 	image/tiff/check \
-	image/ycbcr/check \
 	index/suffixarray/check \
 	io/ioutil/check \
 	log/syslog/check \
diff --git a/libgo/Makefile.in b/libgo/Makefile.in
index ebc63f0f950..6bf18475628 100644
--- a/libgo/Makefile.in
+++ b/libgo/Makefile.in
@@ -167,20 +167,19 @@ am__DEPENDENCIES_2 = bufio/bufio.lo bytes/bytes.lo bytes/index.lo \
 	hash/fnv.lo net/http/cgi.lo net/http/fcgi.lo \
 	net/http/httptest.lo net/http/httputil.lo net/http/pprof.lo \
 	image/bmp.lo image/color.lo image/draw.lo image/gif.lo \
-	image/jpeg.lo image/png.lo image/tiff.lo image/ycbcr.lo \
-	index/suffixarray.lo io/ioutil.lo log/syslog.lo \
-	log/syslog/syslog_c.lo math/big.lo math/cmplx.lo math/rand.lo \
-	mime/mime.lo mime/multipart.lo net/dict.lo net/http.lo \
-	net/mail.lo net/rpc.lo net/smtp.lo net/textproto.lo net/url.lo \
-	old/netchan.lo old/regexp.lo old/template.lo \
-	$(am__DEPENDENCIES_1) os/user.lo os/signal.lo path/filepath.lo \
-	regexp/syntax.lo net/rpc/jsonrpc.lo runtime/debug.lo \
-	runtime/pprof.lo sync/atomic.lo sync/atomic_c.lo \
-	syscall/syscall.lo syscall/errno.lo syscall/wait.lo \
-	text/scanner.lo text/tabwriter.lo text/template.lo \
-	text/template/parse.lo testing/testing.lo testing/iotest.lo \
-	testing/quick.lo testing/script.lo unicode/utf16.lo \
-	unicode/utf8.lo
+	image/jpeg.lo image/png.lo image/tiff.lo index/suffixarray.lo \
+	io/ioutil.lo log/syslog.lo log/syslog/syslog_c.lo math/big.lo \
+	math/cmplx.lo math/rand.lo mime/mime.lo mime/multipart.lo \
+	net/dict.lo net/http.lo net/mail.lo net/rpc.lo net/smtp.lo \
+	net/textproto.lo net/url.lo old/netchan.lo old/regexp.lo \
+	old/template.lo $(am__DEPENDENCIES_1) os/user.lo os/signal.lo \
+	path/filepath.lo regexp/syntax.lo net/rpc/jsonrpc.lo \
+	runtime/debug.lo runtime/pprof.lo sync/atomic.lo \
+	sync/atomic_c.lo syscall/syscall.lo syscall/errno.lo \
+	syscall/wait.lo text/scanner.lo text/tabwriter.lo \
+	text/template.lo text/template/parse.lo testing/testing.lo \
+	testing/iotest.lo testing/quick.lo testing/script.lo \
+	unicode/utf16.lo unicode/utf8.lo
 libgo_la_DEPENDENCIES = $(am__DEPENDENCIES_2) $(am__DEPENDENCIES_1) \
 	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1) \
 	$(am__DEPENDENCIES_1)
@@ -732,8 +731,7 @@ toolexeclibgoimage_DATA = \
 	image/gif.gox \
 	image/jpeg.gox \
 	image/png.gox \
-	image/tiff.gox \
-	image/ycbcr.gox
+	image/tiff.gox
 
 toolexeclibgoindexdir = $(toolexeclibgodir)/index
 toolexeclibgoindex_DATA = \
@@ -972,7 +970,8 @@ go_image_files = \
 	go/image/format.go \
 	go/image/geom.go \
 	go/image/image.go \
-	go/image/names.go
+	go/image/names.go \
+	go/image/ycbcr.go
 
 go_io_files = \
 	go/io/multi.go \
@@ -1034,10 +1033,12 @@ go_mime_files = \
 
 # By default use select with pipes.  Most systems should have
 # something better.
-@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_RTEMS_FALSE@go_net_fd_os_file = go/net/fd_select.go
+@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_FALSE@@LIBGO_IS_RTEMS_FALSE@go_net_fd_os_file = go/net/fd_select.go
+@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_TRUE@@LIBGO_IS_RTEMS_FALSE@go_net_fd_os_file = go/net/fd_netbsd.go
 @LIBGO_IS_LINUX_TRUE@@LIBGO_IS_RTEMS_FALSE@go_net_fd_os_file = go/net/fd_linux.go
 @LIBGO_IS_RTEMS_TRUE@go_net_fd_os_file = go/net/fd_select.go
-@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_RTEMS_FALSE@go_net_newpollserver_file = go/net/newpollserver.go
+@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_FALSE@@LIBGO_IS_RTEMS_FALSE@go_net_newpollserver_file = go/net/newpollserver.go
+@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_TRUE@@LIBGO_IS_RTEMS_FALSE@go_net_newpollserver_file = go/net/newpollserver.go
 @LIBGO_IS_LINUX_TRUE@@LIBGO_IS_RTEMS_FALSE@go_net_newpollserver_file = go/net/newpollserver.go
 @LIBGO_IS_RTEMS_TRUE@go_net_newpollserver_file = go/net/newpollserver_rtems.go
 @LIBGO_IS_IRIX_FALSE@@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_SOLARIS_FALSE@go_net_cgo_file = go/net/cgo_bsd.go
@@ -1050,7 +1051,8 @@ go_mime_files = \
 @LIBGO_IS_LINUX_TRUE@go_net_sock_file = go/net/sock_linux.go
 @LIBGO_IS_LINUX_FALSE@go_net_sendfile_file = go/net/sendfile_stub.go
 @LIBGO_IS_LINUX_TRUE@go_net_sendfile_file = go/net/sendfile_linux.go
-@LIBGO_IS_LINUX_FALSE@go_net_interface_file = go/net/interface_stub.go
+@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_FALSE@go_net_interface_file = go/net/interface_stub.go
+@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_TRUE@go_net_interface_file = go/net/interface_netbsd.go
 @LIBGO_IS_LINUX_TRUE@go_net_interface_file = go/net/interface_linux.go
 go_net_files = \
 	go/net/cgo_unix.go \
@@ -1165,6 +1167,7 @@ go_strconv_files = \
 	go/strconv/atof.go \
 	go/strconv/atoi.go \
 	go/strconv/decimal.go \
+	go/strconv/extfloat.go \
 	go/strconv/ftoa.go \
 	go/strconv/itoa.go \
 	go/strconv/quote.go
@@ -1194,7 +1197,8 @@ go_syslog_c_files = \
 go_testing_files = \
 	go/testing/benchmark.go \
 	go/testing/example.go \
-	go/testing/testing.go
+	go/testing/testing.go \
+	go/testing/wrapper.go
 
 go_time_files = \
 	go/time/format.go \
@@ -1563,7 +1567,9 @@ go_go_build_files = \
 go_go_doc_files = \
 	go/go/doc/comment.go \
 	go/go/doc/doc.go \
-	go/go/doc/example.go
+	go/go/doc/example.go \
+	go/go/doc/exports.go \
+	go/go/doc/filter.go
 
 go_go_parser_files = \
 	go/go/parser/interface.go \
@@ -1614,7 +1620,8 @@ go_image_bmp_files = \
 	go/image/bmp/reader.go
 
 go_image_color_files = \
-	go/image/color/color.go
+	go/image/color/color.go \
+	go/image/color/ycbcr.go
 
 go_image_draw_files = \
 	go/image/draw/draw.go
@@ -1639,9 +1646,6 @@ go_image_tiff_files = \
 	go/image/tiff/consts.go \
 	go/image/tiff/reader.go
 
-go_image_ycbcr_files = \
-	go/image/ycbcr/ycbcr.go
-
 go_index_suffixarray_files = \
 	go/index/suffixarray/qsufsort.go \
 	go/index/suffixarray/suffixarray.go
@@ -1694,6 +1698,7 @@ go_net_http_files = \
 	go/net/http/filetransport.go \
 	go/net/http/fs.go \
 	go/net/http/header.go \
+	go/net/http/jar.go \
 	go/net/http/lex.go \
 	go/net/http/request.go \
 	go/net/http/response.go \
@@ -2043,7 +2048,6 @@ libgo_go_objs = \
 	image/jpeg.lo \
 	image/png.lo \
 	image/tiff.lo \
-	image/ycbcr.lo \
 	index/suffixarray.lo \
 	io/ioutil.lo \
 	log/syslog.lo \
@@ -2299,11 +2303,11 @@ TEST_PACKAGES = \
 	hash/crc32/check \
 	hash/crc64/check \
 	hash/fnv/check \
+	image/color/check \
 	image/draw/check \
 	image/jpeg/check \
 	image/png/check \
 	image/tiff/check \
-	image/ycbcr/check \
 	index/suffixarray/check \
 	io/ioutil/check \
 	log/syslog/check \
@@ -5657,16 +5661,6 @@ image/tiff/check: $(CHECK_DEPS)
 	@$(CHECK)
 .PHONY: image/tiff/check
 
-@go_include@ image/ycbcr.lo.dep
-image/ycbcr.lo.dep: $(go_image_ycbcr_files)
-	$(BUILDDEPS)
-image/ycbcr.lo: $(go_image_ycbcr_files)
-	$(BUILDPACKAGE)
-image/ycbcr/check: $(CHECK_DEPS)
-	@$(MKDIR_P) image/ycbcr
-	@$(CHECK)
-.PHONY: image/ycbcr/check
-
 @go_include@ index/suffixarray.lo.dep
 index/suffixarray.lo.dep: $(go_index_suffixarray_files)
 	$(BUILDDEPS)
@@ -6314,8 +6308,6 @@ image/png.gox: image/png.lo
 	$(BUILDGOX)
 image/tiff.gox: image/tiff.lo
 	$(BUILDGOX)
-image/ycbcr.gox: image/ycbcr.lo
-	$(BUILDGOX)
 
 index/suffixarray.gox: index/suffixarray.lo
 	$(BUILDGOX)
diff --git a/libgo/configure b/libgo/configure
index c1ee7bac082..7e8a38d37b4 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -657,6 +657,8 @@ LIBGO_IS_SOLARIS_FALSE
 LIBGO_IS_SOLARIS_TRUE
 LIBGO_IS_RTEMS_FALSE
 LIBGO_IS_RTEMS_TRUE
+LIBGO_IS_NETBSD_FALSE
+LIBGO_IS_NETBSD_TRUE
 LIBGO_IS_LINUX_FALSE
 LIBGO_IS_LINUX_TRUE
 LIBGO_IS_IRIX_FALSE
@@ -11097,7 +11099,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11100 "configure"
+#line 11102 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11203,7 +11205,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11206 "configure"
+#line 11208 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -13473,6 +13475,7 @@ case ${host} in
   *-*-freebsd*)  is_freebsd=yes; GOOS=freebsd ;;
   *-*-irix6*)    is_irix=yes;    GOOS=irix ;;
   *-*-linux*)    is_linux=yes;   GOOS=linux ;;
+  *-*-netbsd*)	 is_netbsd=yes;  GOOS=netbsd ;;
   *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
   *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
 esac
@@ -13508,6 +13511,14 @@ else
   LIBGO_IS_LINUX_FALSE=
 fi
 
+ if test $is_netbsd = yes; then
+  LIBGO_IS_NETBSD_TRUE=
+  LIBGO_IS_NETBSD_FALSE='#'
+else
+  LIBGO_IS_NETBSD_TRUE='#'
+  LIBGO_IS_NETBSD_FALSE=
+fi
+
  if test $is_rtems = yes; then
   LIBGO_IS_RTEMS_TRUE=
   LIBGO_IS_RTEMS_FALSE='#'
@@ -14938,6 +14949,10 @@ if test -z "${LIBGO_IS_LINUX_TRUE}" && test -z "${LIBGO_IS_LINUX_FALSE}"; then
   as_fn_error "conditional \"LIBGO_IS_LINUX\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${LIBGO_IS_NETBSD_TRUE}" && test -z "${LIBGO_IS_NETBSD_FALSE}"; then
+  as_fn_error "conditional \"LIBGO_IS_NETBSD\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${LIBGO_IS_RTEMS_TRUE}" && test -z "${LIBGO_IS_RTEMS_FALSE}"; then
   as_fn_error "conditional \"LIBGO_IS_RTEMS\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
diff --git a/libgo/configure.ac b/libgo/configure.ac
index a56106eaca9..81326557afa 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -134,6 +134,7 @@ case ${host} in
   *-*-freebsd*)  is_freebsd=yes; GOOS=freebsd ;;
   *-*-irix6*)    is_irix=yes;    GOOS=irix ;;
   *-*-linux*)    is_linux=yes;   GOOS=linux ;;
+  *-*-netbsd*)	 is_netbsd=yes;  GOOS=netbsd ;;
   *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
   *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
 esac
@@ -141,6 +142,7 @@ AM_CONDITIONAL(LIBGO_IS_DARWIN, test $is_darwin = yes)
 AM_CONDITIONAL(LIBGO_IS_FREEBSD, test $is_freebsd = yes)
 AM_CONDITIONAL(LIBGO_IS_IRIX, test $is_irix = yes)
 AM_CONDITIONAL(LIBGO_IS_LINUX, test $is_linux = yes)
+AM_CONDITIONAL(LIBGO_IS_NETBSD, test $is_netbsd = yes)
 AM_CONDITIONAL(LIBGO_IS_RTEMS, test $is_rtems = yes)
 AM_CONDITIONAL(LIBGO_IS_SOLARIS, test $is_solaris = yes)
 AC_SUBST(GOOS)
diff --git a/libgo/go/archive/zip/reader_test.go b/libgo/go/archive/zip/reader_test.go
index 9594fe8e508..0e40268c2f8 100644
--- a/libgo/go/archive/zip/reader_test.go
+++ b/libgo/go/archive/zip/reader_test.go
@@ -163,10 +163,10 @@ func readTestZip(t *testing.T, zt ZipTest) {
 	done := make(chan bool)
 	for i := 0; i < 5; i++ {
 		for j, ft := range zt.File {
-			go func() {
+			go func(j int, ft ZipTestFile) {
 				readTestFile(t, ft, z.File[j])
 				done <- true
-			}()
+			}(j, ft)
 			n++
 		}
 	}
diff --git a/libgo/go/archive/zip/struct.go b/libgo/go/archive/zip/struct.go
index c53a83c4e78..34a87fae5b3 100644
--- a/libgo/go/archive/zip/struct.go
+++ b/libgo/go/archive/zip/struct.go
@@ -96,12 +96,28 @@ func msDosTimeToTime(dosDate, dosTime uint16) time.Time {
 	)
 }
 
+// timeToMsDosTime converts a time.Time to an MS-DOS date and time.
+// The resolution is 2s.
+// See: http://msdn.microsoft.com/en-us/library/ms724274(v=VS.85).aspx
+func timeToMsDosTime(t time.Time) (fDate uint16, fTime uint16) {
+	t = t.In(time.UTC)
+	fDate = uint16(t.Day() + int(t.Month())<<5 + (t.Year()-1980)<<9)
+	fTime = uint16(t.Second()/2 + t.Minute()<<5 + t.Hour()<<11)
+	return
+}
+
 // ModTime returns the modification time.
 // The resolution is 2s.
 func (h *FileHeader) ModTime() time.Time {
 	return msDosTimeToTime(h.ModifiedDate, h.ModifiedTime)
 }
 
+// SetModTime sets the ModifiedTime and ModifiedDate fields to the given time.
+// The resolution is 2s.
+func (h *FileHeader) SetModTime(t time.Time) {
+	h.ModifiedDate, h.ModifiedTime = timeToMsDosTime(t)
+}
+
 // traditional names for Unix constants
 const (
 	s_IFMT  = 0xf000
diff --git a/libgo/go/archive/zip/zip_test.go b/libgo/go/archive/zip/zip_test.go
index 2075715f3e0..8aab2b68123 100644
--- a/libgo/go/archive/zip/zip_test.go
+++ b/libgo/go/archive/zip/zip_test.go
@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"io"
 	"testing"
+	"time"
 )
 
 type stringReaderAt string
@@ -55,3 +56,13 @@ func TestOver65kFiles(t *testing.T) {
 		}
 	}
 }
+
+func TestModTime(t *testing.T) {
+	var testTime = time.Date(2009, time.November, 10, 23, 45, 58, 0, time.UTC)
+	fh := new(FileHeader)
+	fh.SetModTime(testTime)
+	outTime := fh.ModTime()
+	if !outTime.Equal(testTime) {
+		t.Errorf("times don't match: got %s, want %s", outTime, testTime)
+	}
+}
diff --git a/libgo/go/bytes/buffer_test.go b/libgo/go/bytes/buffer_test.go
index 52359700322..adb93302a54 100644
--- a/libgo/go/bytes/buffer_test.go
+++ b/libgo/go/bytes/buffer_test.go
@@ -16,7 +16,6 @@ const N = 10000  // make this bigger for a larger (and slower) test
 var data string  // test data for write tests
 var bytes []byte // test data; same as data but as a slice.
 
-
 func init() {
 	bytes = make([]byte, N)
 	for i := 0; i < N; i++ {
diff --git a/libgo/go/bytes/bytes_test.go b/libgo/go/bytes/bytes_test.go
index a2a08c20db0..2a1d41b910e 100644
--- a/libgo/go/bytes/bytes_test.go
+++ b/libgo/go/bytes/bytes_test.go
@@ -289,8 +289,7 @@ func bmIndexByte(b *testing.B, index func([]byte, byte) int, n int) {
 	for i := 0; i < b.N; i++ {
 		j := index(buf, 'x')
 		if j != n-1 {
-			println("bad index", j)
-			panic("bad index")
+			b.Fatal("bad index", j)
 		}
 	}
 	buf[n-1] = '\x00'
@@ -317,7 +316,7 @@ func bmEqual(b *testing.B, equal func([]byte, []byte) bool, n int) {
 	for i := 0; i < b.N; i++ {
 		eq := equal(buf1, buf2)
 		if !eq {
-			panic("bad equal")
+			b.Fatal("bad equal")
 		}
 	}
 	buf1[n-1] = '\x00'
@@ -339,8 +338,7 @@ func bmIndex(b *testing.B, index func([]byte, []byte) int, n int) {
 	for i := 0; i < b.N; i++ {
 		j := index(buf, buf[n-7:])
 		if j != n-7 {
-			println("bad index", j)
-			panic("bad index")
+			b.Fatal("bad index", j)
 		}
 	}
 	buf[n-1] = '\x00'
@@ -362,8 +360,7 @@ func bmIndexEasy(b *testing.B, index func([]byte, []byte) int, n int) {
 	for i := 0; i < b.N; i++ {
 		j := index(buf, buf[n-7:])
 		if j != n-7 {
-			println("bad index", j)
-			panic("bad index")
+			b.Fatal("bad index", j)
 		}
 	}
 	buf[n-1] = '\x00'
@@ -385,8 +382,7 @@ func bmCount(b *testing.B, count func([]byte, []byte) int, n int) {
 	for i := 0; i < b.N; i++ {
 		j := count(buf, buf[n-7:])
 		if j != 1 {
-			println("bad count", j)
-			panic("bad count")
+			b.Fatal("bad count", j)
 		}
 	}
 	buf[n-1] = '\x00'
@@ -408,8 +404,7 @@ func bmCountEasy(b *testing.B, count func([]byte, []byte) int, n int) {
 	for i := 0; i < b.N; i++ {
 		j := count(buf, buf[n-7:])
 		if j != 1 {
-			println("bad count", j)
-			panic("bad count")
+			b.Fatal("bad count", j)
 		}
 	}
 	buf[n-1] = '\x00'
diff --git a/libgo/go/bytes/example_test.go b/libgo/go/bytes/example_test.go
new file mode 100644
index 00000000000..02da1ac082b
--- /dev/null
+++ b/libgo/go/bytes/example_test.go
@@ -0,0 +1,24 @@
+package bytes_test
+
+import (
+	. "bytes"
+	"encoding/base64"
+	"io"
+	"os"
+)
+
+// Hello world!
+func ExampleBuffer() {
+	var b Buffer // A Buffer needs no initialization.
+	b.Write([]byte("Hello "))
+	b.Write([]byte("world!"))
+	b.WriteTo(os.Stdout)
+}
+
+// Gophers rule!
+func ExampleBuffer_reader() {
+	// A Buffer can turn a string or a []byte into an io.Reader.
+	buf := NewBufferString("R29waGVycyBydWxlIQ==")
+	dec := base64.NewDecoder(base64.StdEncoding, buf)
+	io.Copy(os.Stdout, dec)
+}
diff --git a/libgo/go/crypto/aes/aes_test.go b/libgo/go/crypto/aes/aes_test.go
index aa1d0df8e93..e500c666d97 100644
--- a/libgo/go/crypto/aes/aes_test.go
+++ b/libgo/go/crypto/aes/aes_test.go
@@ -356,7 +356,7 @@ func BenchmarkEncrypt(b *testing.B) {
 	tt := encryptTests[0]
 	c, err := NewCipher(tt.key)
 	if err != nil {
-		panic("NewCipher")
+		b.Fatal("NewCipher:", err)
 	}
 	out := make([]byte, len(tt.in))
 	b.StartTimer()
diff --git a/libgo/go/crypto/crypto.go b/libgo/go/crypto/crypto.go
index 53672a4da3c..c913494f61b 100644
--- a/libgo/go/crypto/crypto.go
+++ b/libgo/go/crypto/crypto.go
@@ -71,3 +71,6 @@ func RegisterHash(h Hash, f func() hash.Hash) {
 	}
 	hashes[h] = f
 }
+
+// PrivateKey represents a private key using an unspecified algorithm.
+type PrivateKey interface{}
diff --git a/libgo/go/crypto/openpgp/keys.go b/libgo/go/crypto/openpgp/keys.go
index df39970c0b6..74e7d239e08 100644
--- a/libgo/go/crypto/openpgp/keys.go
+++ b/libgo/go/crypto/openpgp/keys.go
@@ -16,6 +16,7 @@ import (
 
 // PublicKeyType is the armor type for a PGP public key.
 var PublicKeyType = "PGP PUBLIC KEY BLOCK"
+
 // PrivateKeyType is the armor type for a PGP private key.
 var PrivateKeyType = "PGP PRIVATE KEY BLOCK"
 
diff --git a/libgo/go/crypto/rand/rand_unix.go b/libgo/go/crypto/rand/rand_unix.go
index d9cddf6d2ad..5d4fc8198ac 100644
--- a/libgo/go/crypto/rand/rand_unix.go
+++ b/libgo/go/crypto/rand/rand_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Unix cryptographically secure pseudorandom number
 // generator.
diff --git a/libgo/go/crypto/tls/common.go b/libgo/go/crypto/tls/common.go
index f57d932a98f..a461ad951b0 100644
--- a/libgo/go/crypto/tls/common.go
+++ b/libgo/go/crypto/tls/common.go
@@ -5,8 +5,8 @@
 package tls
 
 import (
+	"crypto"
 	"crypto/rand"
-	"crypto/rsa"
 	"crypto/x509"
 	"io"
 	"strings"
@@ -255,7 +255,7 @@ func (c *Config) BuildNameToCertificate() {
 // A Certificate is a chain of one or more certificates, leaf first.
 type Certificate struct {
 	Certificate [][]byte
-	PrivateKey  *rsa.PrivateKey
+	PrivateKey  crypto.PrivateKey // supported types: *rsa.PrivateKey
 	// OCSPStaple contains an optional OCSP response which will be served
 	// to clients that request it.
 	OCSPStaple []byte
diff --git a/libgo/go/crypto/tls/handshake_client.go b/libgo/go/crypto/tls/handshake_client.go
index e39e59cd5a1..73648002bd5 100644
--- a/libgo/go/crypto/tls/handshake_client.go
+++ b/libgo/go/crypto/tls/handshake_client.go
@@ -234,7 +234,7 @@ func (c *Conn) clientHandshake() error {
 		digest := make([]byte, 0, 36)
 		digest = finishedHash.serverMD5.Sum(digest)
 		digest = finishedHash.serverSHA1.Sum(digest)
-		signed, err := rsa.SignPKCS1v15(c.config.rand(), c.config.Certificates[0].PrivateKey, crypto.MD5SHA1, digest)
+		signed, err := rsa.SignPKCS1v15(c.config.rand(), c.config.Certificates[0].PrivateKey.(*rsa.PrivateKey), crypto.MD5SHA1, digest)
 		if err != nil {
 			return c.sendAlert(alertInternalError)
 		}
diff --git a/libgo/go/crypto/tls/key_agreement.go b/libgo/go/crypto/tls/key_agreement.go
index b531717d840..c3c16647853 100644
--- a/libgo/go/crypto/tls/key_agreement.go
+++ b/libgo/go/crypto/tls/key_agreement.go
@@ -44,7 +44,7 @@ func (ka rsaKeyAgreement) processClientKeyExchange(config *Config, ckx *clientKe
 		ciphertext = ckx.ciphertext[2:]
 	}
 
-	err = rsa.DecryptPKCS1v15SessionKey(config.rand(), config.Certificates[0].PrivateKey, ciphertext, preMasterSecret)
+	err = rsa.DecryptPKCS1v15SessionKey(config.rand(), config.Certificates[0].PrivateKey.(*rsa.PrivateKey), ciphertext, preMasterSecret)
 	if err != nil {
 		return nil, err
 	}
@@ -147,7 +147,7 @@ Curve:
 	copy(serverECDHParams[4:], ecdhePublic)
 
 	md5sha1 := md5SHA1Hash(clientHello.random, hello.random, serverECDHParams)
-	sig, err := rsa.SignPKCS1v15(config.rand(), config.Certificates[0].PrivateKey, crypto.MD5SHA1, md5sha1)
+	sig, err := rsa.SignPKCS1v15(config.rand(), config.Certificates[0].PrivateKey.(*rsa.PrivateKey), crypto.MD5SHA1, md5sha1)
 	if err != nil {
 		return nil, errors.New("failed to sign ECDHE parameters: " + err.Error())
 	}
diff --git a/libgo/go/crypto/tls/root_darwin.go b/libgo/go/crypto/tls/root_darwin.go
index 15122416bd1..db1b18b3c07 100644
--- a/libgo/go/crypto/tls/root_darwin.go
+++ b/libgo/go/crypto/tls/root_darwin.go
@@ -8,7 +8,7 @@ package tls
 // Note: We disable -Werror here because the code in this file uses a deprecated API to stay
 // compatible with both Mac OS X 10.6 and 10.7. Using a deprecated function on Darwin generates
 // a warning.
-#cgo CFLAGS: -Wno-error
+#cgo CFLAGS: -Wno-error -Wno-deprecated-declarations
 #cgo LDFLAGS: -framework CoreFoundation -framework Security
 #include <CoreFoundation/CoreFoundation.h>
 #include <Security/Security.h>
diff --git a/libgo/go/crypto/tls/root_stub.go b/libgo/go/crypto/tls/root_stub.go
index 18dcb02043a..d00493a5736 100644
--- a/libgo/go/crypto/tls/root_stub.go
+++ b/libgo/go/crypto/tls/root_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build plan9
+// +build plan9 darwin/nocgo
 
 package tls
 
diff --git a/libgo/go/crypto/x509/cert_pool.go b/libgo/go/crypto/x509/cert_pool.go
index adc7f9bc6d7..5a0a87678e3 100644
--- a/libgo/go/crypto/x509/cert_pool.go
+++ b/libgo/go/crypto/x509/cert_pool.go
@@ -28,6 +28,9 @@ func NewCertPool() *CertPool {
 // given certificate. If no such certificate can be found or the signature
 // doesn't match, it returns nil.
 func (s *CertPool) findVerifiedParents(cert *Certificate) (parents []int) {
+	if s == nil {
+		return
+	}
 	var candidates []int
 
 	if len(cert.AuthorityKeyId) > 0 {
diff --git a/libgo/go/crypto/x509/verify_test.go b/libgo/go/crypto/x509/verify_test.go
index df5443023ff..2016858307e 100644
--- a/libgo/go/crypto/x509/verify_test.go
+++ b/libgo/go/crypto/x509/verify_test.go
@@ -19,6 +19,7 @@ type verifyTest struct {
 	roots         []string
 	currentTime   int64
 	dnsName       string
+	nilRoots      bool
 
 	errorCallback  func(*testing.T, int, error) bool
 	expectedChains [][]string
@@ -45,6 +46,14 @@ var verifyTests = []verifyTest{
 
 		errorCallback: expectHostnameError,
 	},
+	{
+		leaf:          googleLeaf,
+		intermediates: []string{thawteIntermediate},
+		nilRoots:      true, // verifies that we don't crash
+		currentTime:   1302726541,
+		dnsName:       "www.google.com",
+		errorCallback: expectAuthorityUnknown,
+	},
 	{
 		leaf:          googleLeaf,
 		intermediates: []string{thawteIntermediate},
@@ -136,6 +145,9 @@ func TestVerify(t *testing.T) {
 			DNSName:       test.dnsName,
 			CurrentTime:   time.Unix(test.currentTime, 0),
 		}
+		if test.nilRoots {
+			opts.Roots = nil
+		}
 
 		for j, root := range test.roots {
 			ok := opts.Roots.AppendCertsFromPEM([]byte(root))
diff --git a/libgo/go/crypto/x509/x509.go b/libgo/go/crypto/x509/x509.go
index 65ca3158003..28c7880e531 100644
--- a/libgo/go/crypto/x509/x509.go
+++ b/libgo/go/crypto/x509/x509.go
@@ -981,6 +981,7 @@ func CreateCertificate(rand io.Reader, template, parent *Certificate, pub *rsa.P
 // pemCRLPrefix is the magic string that indicates that we have a PEM encoded
 // CRL.
 var pemCRLPrefix = []byte("-----BEGIN X509 CRL")
+
 // pemType is the type of a PEM encoded CRL.
 var pemType = "X509 CRL"
 
diff --git a/libgo/go/debug/gosym/pclntab_test.go b/libgo/go/debug/gosym/pclntab_test.go
index 562e7a0a37f..e5c29889b7f 100644
--- a/libgo/go/debug/gosym/pclntab_test.go
+++ b/libgo/go/debug/gosym/pclntab_test.go
@@ -13,7 +13,8 @@ import (
 
 func dotest() bool {
 	// For now, only works on ELF platforms.
-	return syscall.OS == "linux" && os.Getenv("GOARCH") == "amd64"
+	// TODO: convert to work with new go tool
+	return false && syscall.OS == "linux" && os.Getenv("GOARCH") == "amd64"
 }
 
 func getTable(t *testing.T) *Table {
diff --git a/libgo/go/encoding/binary/binary_test.go b/libgo/go/encoding/binary/binary_test.go
index fd4fdb01574..3e7057ea227 100644
--- a/libgo/go/encoding/binary/binary_test.go
+++ b/libgo/go/encoding/binary/binary_test.go
@@ -171,11 +171,42 @@ func (br *byteSliceReader) Read(p []byte) (int, error) {
 	return n, nil
 }
 
-func BenchmarkRead(b *testing.B) {
+func BenchmarkReadSlice1000Int32s(b *testing.B) {
+	bsr := &byteSliceReader{}
+	slice := make([]int32, 1000)
+	buf := make([]byte, len(slice)*4)
+	b.SetBytes(int64(len(buf)))
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		bsr.remain = buf
+		Read(bsr, BigEndian, slice)
+	}
+}
+
+func BenchmarkReadStruct(b *testing.B) {
+	bsr := &byteSliceReader{}
+	var buf bytes.Buffer
+	Write(&buf, BigEndian, &s)
+	n := TotalSize(reflect.ValueOf(s))
+	b.SetBytes(int64(n))
+	t := s
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		bsr.remain = buf.Bytes()
+		Read(bsr, BigEndian, &t)
+	}
+	b.StopTimer()
+	if !reflect.DeepEqual(s, t) {
+		b.Fatal("no match")
+	}
+}
+
+func BenchmarkReadInts(b *testing.B) {
 	var ls Struct
 	bsr := &byteSliceReader{}
 	var r io.Reader = bsr
-
+	b.SetBytes(2 * (1 + 2 + 4 + 8))
+	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		bsr.remain = big
 		Read(r, BigEndian, &ls.Int8)
@@ -196,25 +227,19 @@ func BenchmarkRead(b *testing.B) {
 	for i := range want.Array {
 		want.Array[i] = 0
 	}
+	b.StopTimer()
 	if !reflect.DeepEqual(ls, want) {
 		panic("no match")
 	}
 }
 
-func BenchmarkWrite(b *testing.B) {
+func BenchmarkWriteInts(b *testing.B) {
 	buf := new(bytes.Buffer)
 	var w io.Writer = buf
-
+	b.SetBytes(2 * (1 + 2 + 4 + 8))
+	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		buf.Reset()
-		Write(w, BigEndian, &s.Int8)
-		Write(w, BigEndian, &s.Int16)
-		Write(w, BigEndian, &s.Int32)
-		Write(w, BigEndian, &s.Int64)
-		Write(w, BigEndian, &s.Uint8)
-		Write(w, BigEndian, &s.Uint16)
-		Write(w, BigEndian, &s.Uint32)
-		Write(w, BigEndian, &s.Uint64)
 		Write(w, BigEndian, s.Int8)
 		Write(w, BigEndian, s.Int16)
 		Write(w, BigEndian, s.Int32)
@@ -224,11 +249,8 @@ func BenchmarkWrite(b *testing.B) {
 		Write(w, BigEndian, s.Uint32)
 		Write(w, BigEndian, s.Uint64)
 	}
-
-	if !bytes.Equal(buf.Bytes()[:30], big[:30]) {
-		panic("first half doesn't match")
-	}
-	if !bytes.Equal(buf.Bytes()[30:], big[:30]) {
-		panic("second half doesn't match")
+	b.StopTimer()
+	if !bytes.Equal(buf.Bytes(), big[:30]) {
+		b.Fatalf("first half doesn't match: %x %x", buf.Bytes(), big[:30])
 	}
 }
diff --git a/libgo/go/encoding/binary/varint_test.go b/libgo/go/encoding/binary/varint_test.go
index b553d6d4eb0..dc550f22f44 100644
--- a/libgo/go/encoding/binary/varint_test.go
+++ b/libgo/go/encoding/binary/varint_test.go
@@ -165,6 +165,7 @@ func TestNonCanonicalZero(t *testing.T) {
 
 func BenchmarkPutUvarint32(b *testing.B) {
 	buf := make([]byte, MaxVarintLen32)
+	b.SetBytes(4)
 	for i := 0; i < b.N; i++ {
 		for j := uint(0); j < MaxVarintLen32; j++ {
 			PutUvarint(buf, 1<<(j*7))
@@ -174,6 +175,7 @@ func BenchmarkPutUvarint32(b *testing.B) {
 
 func BenchmarkPutUvarint64(b *testing.B) {
 	buf := make([]byte, MaxVarintLen64)
+	b.SetBytes(8)
 	for i := 0; i < b.N; i++ {
 		for j := uint(0); j < MaxVarintLen64; j++ {
 			PutUvarint(buf, 1<<(j*7))
diff --git a/libgo/go/encoding/gob/codec_test.go b/libgo/go/encoding/gob/codec_test.go
index dc0e0078e68..73844b920c1 100644
--- a/libgo/go/encoding/gob/codec_test.go
+++ b/libgo/go/encoding/gob/codec_test.go
@@ -102,12 +102,15 @@ func TestIntCodec(t *testing.T) {
 
 // The result of encoding a true boolean with field number 7
 var boolResult = []byte{0x07, 0x01}
+
 // The result of encoding a number 17 with field number 7
 var signedResult = []byte{0x07, 2 * 17}
 var unsignedResult = []byte{0x07, 17}
 var floatResult = []byte{0x07, 0xFE, 0x31, 0x40}
+
 // The result of encoding a number 17+19i with field number 7
 var complexResult = []byte{0x07, 0xFE, 0x31, 0x40, 0xFE, 0x33, 0x40}
+
 // The result of encoding "hello" with field number 7
 var bytesResult = []byte{0x07, 0x05, 'h', 'e', 'l', 'l', 'o'}
 
diff --git a/libgo/go/encoding/gob/encode.go b/libgo/go/encoding/gob/encode.go
index c7e48230c53..f05b17c3096 100644
--- a/libgo/go/encoding/gob/encode.go
+++ b/libgo/go/encoding/gob/encode.go
@@ -469,7 +469,14 @@ func (enc *Encoder) encodeInterface(b *bytes.Buffer, iv reflect.Value) {
 // isZero returns whether the value is the zero of its type.
 func isZero(val reflect.Value) bool {
 	switch val.Kind() {
-	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
+	case reflect.Array:
+		for i := 0; i < val.Len(); i++ {
+			if !isZero(val.Index(i)) {
+				return false
+			}
+		}
+		return true
+	case reflect.Map, reflect.Slice, reflect.String:
 		return val.Len() == 0
 	case reflect.Bool:
 		return !val.Bool()
@@ -483,6 +490,13 @@ func isZero(val reflect.Value) bool {
 		return val.Float() == 0
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
 		return val.Uint() == 0
+	case reflect.Struct:
+		for i := 0; i < val.NumField(); i++ {
+			if !isZero(val.Field(i)) {
+				return false
+			}
+		}
+		return true
 	}
 	panic("unknown type in isZero " + val.Type().String())
 }
diff --git a/libgo/go/encoding/gob/gobencdec_test.go b/libgo/go/encoding/gob/gobencdec_test.go
index eacfd842db3..b8dfeeb5156 100644
--- a/libgo/go/encoding/gob/gobencdec_test.go
+++ b/libgo/go/encoding/gob/gobencdec_test.go
@@ -13,6 +13,7 @@ import (
 	"io"
 	"strings"
 	"testing"
+	"time"
 )
 
 // Types that implement the GobEncoder/Decoder interfaces.
@@ -526,3 +527,50 @@ func TestGobEncoderExtraIndirect(t *testing.T) {
 		t.Errorf("got = %q, want %q", got, gdb)
 	}
 }
+
+// Another bug: this caused a crash with the new Go1 Time type.
+// We throw in a gob-encoding array, to test another case of isZero
+
+type isZeroBug struct {
+	T time.Time
+	S string
+	I int
+	A isZeroBugArray
+}
+
+type isZeroBugArray [2]uint8
+
+// Receiver is value, not pointer, to test isZero of array.
+func (a isZeroBugArray) GobEncode() (b []byte, e error) {
+	b = append(b, a[:]...)
+	return b, nil
+}
+
+func (a *isZeroBugArray) GobDecode(data []byte) error {
+	println("DECODE")
+	if len(data) != len(a) {
+		return io.EOF
+	}
+	a[0] = data[0]
+	a[1] = data[1]
+	return nil
+}
+
+func TestGobEncodeIsZero(t *testing.T) {
+	x := isZeroBug{time.Now(), "hello", -55, isZeroBugArray{1, 2}}
+	b := new(bytes.Buffer)
+	enc := NewEncoder(b)
+	err := enc.Encode(x)
+	if err != nil {
+		t.Fatal("encode:", err)
+	}
+	var y isZeroBug
+	dec := NewDecoder(b)
+	err = dec.Decode(&y)
+	if err != nil {
+		t.Fatal("decode:", err)
+	}
+	if x != y {
+		t.Fatalf("%v != %v", x, y)
+	}
+}
diff --git a/libgo/go/encoding/gob/timing_test.go b/libgo/go/encoding/gob/timing_test.go
index 47437a607f1..1017eb7f51d 100644
--- a/libgo/go/encoding/gob/timing_test.go
+++ b/libgo/go/encoding/gob/timing_test.go
@@ -39,7 +39,7 @@ func benchmarkEndToEnd(r io.Reader, w io.Writer, b *testing.B) {
 func BenchmarkEndToEndPipe(b *testing.B) {
 	r, w, err := os.Pipe()
 	if err != nil {
-		panic("can't get pipe:" + err.Error())
+		b.Fatal("can't get pipe:", err)
 	}
 	benchmarkEndToEnd(r, w, b)
 }
diff --git a/libgo/go/encoding/gob/type.go b/libgo/go/encoding/gob/type.go
index 1b20843fa25..71a28be7cab 100644
--- a/libgo/go/encoding/gob/type.go
+++ b/libgo/go/encoding/gob/type.go
@@ -130,6 +130,7 @@ func userType(rt reflect.Type) *userTypeInfo {
 	}
 	return ut
 }
+
 // A typeId represents a gob Type as an integer that can be passed on the wire.
 // Internally, typeIds are used as keys to a map to recover the underlying type info.
 type typeId int32
diff --git a/libgo/go/encoding/json/bench_test.go b/libgo/go/encoding/json/bench_test.go
index f0c52011a1d..333c1c0ce9e 100644
--- a/libgo/go/encoding/json/bench_test.go
+++ b/libgo/go/encoding/json/bench_test.go
@@ -84,7 +84,7 @@ func BenchmarkCodeEncoder(b *testing.B) {
 	enc := NewEncoder(ioutil.Discard)
 	for i := 0; i < b.N; i++ {
 		if err := enc.Encode(&codeStruct); err != nil {
-			panic(err)
+			b.Fatal("Encode:", err)
 		}
 	}
 	b.SetBytes(int64(len(codeJSON)))
@@ -98,7 +98,7 @@ func BenchmarkCodeMarshal(b *testing.B) {
 	}
 	for i := 0; i < b.N; i++ {
 		if _, err := Marshal(&codeStruct); err != nil {
-			panic(err)
+			b.Fatal("Marshal:", err)
 		}
 	}
 	b.SetBytes(int64(len(codeJSON)))
@@ -120,7 +120,7 @@ func BenchmarkCodeDecoder(b *testing.B) {
 		buf.WriteByte('\n')
 		buf.WriteByte('\n')
 		if err := dec.Decode(&r); err != nil {
-			panic(err)
+			b.Fatal("Decode:", err)
 		}
 	}
 	b.SetBytes(int64(len(codeJSON)))
@@ -135,7 +135,7 @@ func BenchmarkCodeUnmarshal(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		var r codeResponse
 		if err := Unmarshal(codeJSON, &r); err != nil {
-			panic(err)
+			b.Fatal("Unmmarshal:", err)
 		}
 	}
 	b.SetBytes(int64(len(codeJSON)))
@@ -150,7 +150,7 @@ func BenchmarkCodeUnmarshalReuse(b *testing.B) {
 	var r codeResponse
 	for i := 0; i < b.N; i++ {
 		if err := Unmarshal(codeJSON, &r); err != nil {
-			panic(err)
+			b.Fatal("Unmmarshal:", err)
 		}
 	}
 	b.SetBytes(int64(len(codeJSON)))
diff --git a/libgo/go/encoding/json/decode.go b/libgo/go/encoding/json/decode.go
index 0a700926296..8287b330034 100644
--- a/libgo/go/encoding/json/decode.go
+++ b/libgo/go/encoding/json/decode.go
@@ -228,7 +228,9 @@ func (d *decodeState) value(v reflect.Value) {
 		// Feed in an empty string - the shortest, simplest value -
 		// so that it knows we got to the end of the value.
 		if d.scan.redo {
-			panic("redo")
+			// rewind.
+			d.scan.redo = false
+			d.scan.step = stateBeginValue
 		}
 		d.scan.step(&d.scan, '"')
 		d.scan.step(&d.scan, '"')
@@ -317,25 +319,22 @@ func (d *decodeState) array(v reflect.Value) {
 	}
 	v = pv
 
-	// Decoding into nil interface?  Switch to non-reflect code.
-	iv := v
-	ok := iv.Kind() == reflect.Interface
-	if ok {
-		iv.Set(reflect.ValueOf(d.arrayInterface()))
-		return
-	}
-
 	// Check type of target.
-	av := v
-	if av.Kind() != reflect.Array && av.Kind() != reflect.Slice {
+	switch v.Kind() {
+	default:
 		d.saveError(&UnmarshalTypeError{"array", v.Type()})
 		d.off--
 		d.next()
 		return
+	case reflect.Interface:
+		// Decoding into nil interface?  Switch to non-reflect code.
+		v.Set(reflect.ValueOf(d.arrayInterface()))
+		return
+	case reflect.Array:
+	case reflect.Slice:
+		break
 	}
 
-	sv := v
-
 	i := 0
 	for {
 		// Look ahead for ] - can only happen on first iteration.
@@ -349,23 +348,25 @@ func (d *decodeState) array(v reflect.Value) {
 		d.scan.undo(op)
 
 		// Get element of array, growing if necessary.
-		if i >= av.Cap() && sv.IsValid() {
-			newcap := sv.Cap() + sv.Cap()/2
-			if newcap < 4 {
-				newcap = 4
+		if v.Kind() == reflect.Slice {
+			// Grow slice if necessary
+			if i >= v.Cap() {
+				newcap := v.Cap() + v.Cap()/2
+				if newcap < 4 {
+					newcap = 4
+				}
+				newv := reflect.MakeSlice(v.Type(), v.Len(), newcap)
+				reflect.Copy(newv, v)
+				v.Set(newv)
+			}
+			if i >= v.Len() {
+				v.SetLen(i + 1)
 			}
-			newv := reflect.MakeSlice(sv.Type(), sv.Len(), newcap)
-			reflect.Copy(newv, sv)
-			sv.Set(newv)
-		}
-		if i >= av.Len() && sv.IsValid() {
-			// Must be slice; gave up on array during i >= av.Cap().
-			sv.SetLen(i + 1)
 		}
 
-		// Decode into element.
-		if i < av.Len() {
-			d.value(av.Index(i))
+		if i < v.Len() {
+			// Decode into element.
+			d.value(v.Index(i))
 		} else {
 			// Ran out of fixed array: skip.
 			d.value(reflect.Value{})
@@ -382,19 +383,19 @@ func (d *decodeState) array(v reflect.Value) {
 		}
 	}
 
-	if i < av.Len() {
-		if !sv.IsValid() {
+	if i < v.Len() {
+		if v.Kind() == reflect.Array {
 			// Array.  Zero the rest.
-			z := reflect.Zero(av.Type().Elem())
-			for ; i < av.Len(); i++ {
-				av.Index(i).Set(z)
+			z := reflect.Zero(v.Type().Elem())
+			for ; i < v.Len(); i++ {
+				v.Index(i).Set(z)
 			}
 		} else {
-			sv.SetLen(i)
+			v.SetLen(i)
 		}
 	}
-	if i == 0 && av.Kind() == reflect.Slice && sv.IsNil() {
-		sv.Set(reflect.MakeSlice(sv.Type(), 0, 0))
+	if i == 0 && v.Kind() == reflect.Slice {
+		v.Set(reflect.MakeSlice(v.Type(), 0, 0))
 	}
 }
 
diff --git a/libgo/go/encoding/json/decode_test.go b/libgo/go/encoding/json/decode_test.go
index bf3953eb051..05c8a064a42 100644
--- a/libgo/go/encoding/json/decode_test.go
+++ b/libgo/go/encoding/json/decode_test.go
@@ -6,6 +6,7 @@ package json
 
 import (
 	"bytes"
+	"fmt"
 	"reflect"
 	"strings"
 	"testing"
@@ -73,6 +74,12 @@ var unmarshalTests = []unmarshalTest{
 
 	// syntax errors
 	{`{"X": "foo", "Y"}`, nil, nil, &SyntaxError{"invalid character '}' after object key", 17}},
+	{`[1, 2, 3+]`, nil, nil, &SyntaxError{"invalid character '+' after array element", 9}},
+
+	// array tests
+	{`[1, 2, 3]`, new([3]int), [3]int{1, 2, 3}, nil},
+	{`[1, 2, 3]`, new([1]int), [1]int{1}, nil},
+	{`[1, 2, 3]`, new([5]int), [5]int{1, 2, 3, 0, 0}, nil},
 
 	// composite tests
 	{allValueIndent, new(All), allValue, nil},
@@ -242,6 +249,38 @@ func TestHTMLEscape(t *testing.T) {
 	}
 }
 
+// WrongString is a struct that's misusing the ,string modifier.
+type WrongString struct {
+	Message string `json:"result,string"`
+}
+
+type wrongStringTest struct {
+	in, err string
+}
+
+// TODO(bradfitz): as part of Issue 2331, fix these tests' expected
+// error values to be helpful, rather than the confusing messages they
+// are now.
+var wrongStringTests = []wrongStringTest{
+	{`{"result":"x"}`, "JSON decoder out of sync - data changing underfoot?"},
+	{`{"result":"foo"}`, "json: cannot unmarshal bool into Go value of type string"},
+	{`{"result":"123"}`, "json: cannot unmarshal number into Go value of type string"},
+}
+
+// If people misuse the ,string modifier, the error message should be
+// helpful, telling the user that they're doing it wrong.
+func TestErrorMessageFromMisusedString(t *testing.T) {
+	for n, tt := range wrongStringTests {
+		r := strings.NewReader(tt.in)
+		var s WrongString
+		err := NewDecoder(r).Decode(&s)
+		got := fmt.Sprintf("%v", err)
+		if got != tt.err {
+			t.Errorf("%d. got err = %q, want %q", n, got, tt.err)
+		}
+	}
+}
+
 func noSpace(c rune) rune {
 	if isSpace(c) {
 		return -1
diff --git a/libgo/go/encoding/json/encode.go b/libgo/go/encoding/json/encode.go
index ff8e80c091e..3d2f4fc316e 100644
--- a/libgo/go/encoding/json/encode.go
+++ b/libgo/go/encoding/json/encode.go
@@ -197,6 +197,7 @@ var hex = "0123456789abcdef"
 // An encodeState encodes JSON into a bytes.Buffer.
 type encodeState struct {
 	bytes.Buffer // accumulated output
+	scratch      [64]byte
 }
 
 func (e *encodeState) marshal(v interface{}) (err error) {
@@ -275,14 +276,26 @@ func (e *encodeState) reflectValueQuoted(v reflect.Value, quoted bool) {
 		}
 
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		writeString(e, strconv.FormatInt(v.Int(), 10))
-
+		b := strconv.AppendInt(e.scratch[:0], v.Int(), 10)
+		if quoted {
+			writeString(e, string(b))
+		} else {
+			e.Write(b)
+		}
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		writeString(e, strconv.FormatUint(v.Uint(), 10))
-
+		b := strconv.AppendUint(e.scratch[:0], v.Uint(), 10)
+		if quoted {
+			writeString(e, string(b))
+		} else {
+			e.Write(b)
+		}
 	case reflect.Float32, reflect.Float64:
-		writeString(e, strconv.FormatFloat(v.Float(), 'g', -1, v.Type().Bits()))
-
+		b := strconv.AppendFloat(e.scratch[:0], v.Float(), 'g', -1, v.Type().Bits())
+		if quoted {
+			writeString(e, string(b))
+		} else {
+			e.Write(b)
+		}
 	case reflect.String:
 		if quoted {
 			sb, err := Marshal(v.String())
diff --git a/libgo/go/encoding/xml/marshal_test.go b/libgo/go/encoding/xml/marshal_test.go
index 80407658015..6a241694baf 100644
--- a/libgo/go/encoding/xml/marshal_test.go
+++ b/libgo/go/encoding/xml/marshal_test.go
@@ -394,7 +394,7 @@ func TestUnmarshal(t *testing.T) {
 		if err != nil {
 			t.Errorf("#%d: unexpected error: %#v", i, err)
 		} else if got, want := dest, test.Value; !reflect.DeepEqual(got, want) {
-			t.Errorf("#%d: unmarshal(%#s) = %#v, want %#v", i, test.ExpectXML, got, want)
+			t.Errorf("#%d: unmarshal(%q) = %#v, want %#v", i, test.ExpectXML, got, want)
 		}
 	}
 }
diff --git a/libgo/go/exp/inotify/inotify_linux_test.go b/libgo/go/exp/inotify/inotify_linux_test.go
index 92384b69376..d035ec1410f 100644
--- a/libgo/go/exp/inotify/inotify_linux_test.go
+++ b/libgo/go/exp/inotify/inotify_linux_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+
 package inotify
 
 import (
@@ -17,6 +19,9 @@ func TestInotifyEvents(t *testing.T) {
 		t.Fatalf("NewWatcher() failed: %s", err)
 	}
 
+	t.Logf("NEEDS TO BE CONVERTED TO NEW GO TOOL") // TODO
+	return
+
 	// Add a watch for "_test"
 	err = watcher.Watch("_test")
 	if err != nil {
diff --git a/libgo/go/exp/sql/sql.go b/libgo/go/exp/sql/sql.go
index 948b911f2e0..937982cdbe6 100644
--- a/libgo/go/exp/sql/sql.go
+++ b/libgo/go/exp/sql/sql.go
@@ -22,10 +22,10 @@ var drivers = make(map[string]driver.Driver)
 // it panics.
 func Register(name string, driver driver.Driver) {
 	if driver == nil {
-		panic("db: Register driver is nil")
+		panic("sql: Register driver is nil")
 	}
 	if _, dup := drivers[name]; dup {
-		panic("db: Register called twice for driver " + name)
+		panic("sql: Register called twice for driver " + name)
 	}
 	drivers[name] = driver
 }
@@ -80,7 +80,7 @@ type ScannerInto interface {
 // ErrNoRows is returned by Scan when QueryRow doesn't return a
 // row. In such a case, QueryRow returns a placeholder *Row value that
 // defers this error until a Scan.
-var ErrNoRows = errors.New("db: no rows in result set")
+var ErrNoRows = errors.New("sql: no rows in result set")
 
 // DB is a database handle. It's safe for concurrent use by multiple
 // goroutines.
@@ -102,7 +102,7 @@ type DB struct {
 func Open(driverName, dataSourceName string) (*DB, error) {
 	driver, ok := drivers[driverName]
 	if !ok {
-		return nil, fmt.Errorf("db: unknown driver %q (forgotten import?)", driverName)
+		return nil, fmt.Errorf("sql: unknown driver %q (forgotten import?)", driverName)
 	}
 	return &DB{driver: driver, dsn: dataSourceName}, nil
 }
@@ -514,7 +514,7 @@ func (s *Stmt) Exec(args ...interface{}) (Result, error) {
 	// placeholders, so we won't sanity check input here and instead let the
 	// driver deal with errors.
 	if want := si.NumInput(); want != -1 && len(args) != want {
-		return nil, fmt.Errorf("db: expected %d arguments, got %d", want, len(args))
+		return nil, fmt.Errorf("sql: expected %d arguments, got %d", want, len(args))
 	}
 
 	// Convert args to subset types.
@@ -522,10 +522,10 @@ func (s *Stmt) Exec(args ...interface{}) (Result, error) {
 		for n, arg := range args {
 			args[n], err = cc.ColumnConverter(n).ConvertValue(arg)
 			if err != nil {
-				return nil, fmt.Errorf("db: converting Exec argument #%d's type: %v", n, err)
+				return nil, fmt.Errorf("sql: converting Exec argument #%d's type: %v", n, err)
 			}
 			if !driver.IsParameterSubsetType(args[n]) {
-				return nil, fmt.Errorf("db: driver ColumnConverter error converted %T to unsupported type %T",
+				return nil, fmt.Errorf("sql: driver ColumnConverter error converted %T to unsupported type %T",
 					arg, args[n])
 			}
 		}
@@ -533,7 +533,7 @@ func (s *Stmt) Exec(args ...interface{}) (Result, error) {
 		for n, arg := range args {
 			args[n], err = driver.DefaultParameterConverter.ConvertValue(arg)
 			if err != nil {
-				return nil, fmt.Errorf("db: converting Exec argument #%d's type: %v", n, err)
+				return nil, fmt.Errorf("sql: converting Exec argument #%d's type: %v", n, err)
 			}
 		}
 	}
@@ -555,7 +555,7 @@ func (s *Stmt) connStmt() (ci driver.Conn, releaseConn func(), si driver.Stmt, e
 	s.mu.Lock()
 	if s.closed {
 		s.mu.Unlock()
-		err = errors.New("db: statement is closed")
+		err = errors.New("sql: statement is closed")
 		return
 	}
 
@@ -617,7 +617,7 @@ func (s *Stmt) Query(args ...interface{}) (*Rows, error) {
 	// placeholders, so we won't sanity check input here and instead let the
 	// driver deal with errors.
 	if want := si.NumInput(); want != -1 && len(args) != want {
-		return nil, fmt.Errorf("db: statement expects %d inputs; got %d", si.NumInput(), len(args))
+		return nil, fmt.Errorf("sql: statement expects %d inputs; got %d", si.NumInput(), len(args))
 	}
 	sargs, err := subsetTypeArgs(args)
 	if err != nil {
@@ -737,27 +737,40 @@ func (rs *Rows) Err() error {
 	return rs.lasterr
 }
 
+// Columns returns the column names.
+// Columns returns an error if the rows are closed, or if the rows
+// are from QueryRow and there was a deferred error.
+func (rs *Rows) Columns() ([]string, error) {
+	if rs.closed {
+		return nil, errors.New("sql: Rows are closed")
+	}
+	if rs.rowsi == nil {
+		return nil, errors.New("sql: no Rows available")
+	}
+	return rs.rowsi.Columns(), nil
+}
+
 // Scan copies the columns in the current row into the values pointed
 // at by dest. If dest contains pointers to []byte, the slices should
 // not be modified and should only be considered valid until the next
 // call to Next or Scan.
 func (rs *Rows) Scan(dest ...interface{}) error {
 	if rs.closed {
-		return errors.New("db: Rows closed")
+		return errors.New("sql: Rows closed")
 	}
 	if rs.lasterr != nil {
 		return rs.lasterr
 	}
 	if rs.lastcols == nil {
-		return errors.New("db: Scan called without calling Next")
+		return errors.New("sql: Scan called without calling Next")
 	}
 	if len(dest) != len(rs.lastcols) {
-		return fmt.Errorf("db: expected %d destination arguments in Scan, not %d", len(rs.lastcols), len(dest))
+		return fmt.Errorf("sql: expected %d destination arguments in Scan, not %d", len(rs.lastcols), len(dest))
 	}
 	for i, sv := range rs.lastcols {
 		err := convertAssign(dest[i], sv)
 		if err != nil {
-			return fmt.Errorf("db: Scan error on column index %d: %v", i, err)
+			return fmt.Errorf("sql: Scan error on column index %d: %v", i, err)
 		}
 	}
 	return nil
diff --git a/libgo/go/exp/sql/sql_test.go b/libgo/go/exp/sql/sql_test.go
index f8ccf764e73..5307a235ddf 100644
--- a/libgo/go/exp/sql/sql_test.go
+++ b/libgo/go/exp/sql/sql_test.go
@@ -75,6 +75,23 @@ func TestQuery(t *testing.T) {
 	}
 }
 
+func TestRowsColumns(t *testing.T) {
+	db := newTestDB(t, "people")
+	defer closeDB(t, db)
+	rows, err := db.Query("SELECT|people|age,name|")
+	if err != nil {
+		t.Fatalf("Query: %v", err)
+	}
+	cols, err := rows.Columns()
+	if err != nil {
+		t.Fatalf("Columns: %v", err)
+	}
+	want := []string{"age", "name"}
+	if !reflect.DeepEqual(cols, want) {
+		t.Errorf("got %#v; want %#v", cols, want)
+	}
+}
+
 func TestQueryRow(t *testing.T) {
 	db := newTestDB(t, "people")
 	defer closeDB(t, db)
@@ -187,12 +204,12 @@ func TestExec(t *testing.T) {
 		{[]interface{}{7, 9}, ""},
 
 		// Invalid conversions:
-		{[]interface{}{"Brad", int64(0xFFFFFFFF)}, "db: converting Exec argument #1's type: sql/driver: value 4294967295 overflows int32"},
-		{[]interface{}{"Brad", "strconv fail"}, "db: converting Exec argument #1's type: sql/driver: value \"strconv fail\" can't be converted to int32"},
+		{[]interface{}{"Brad", int64(0xFFFFFFFF)}, "sql: converting Exec argument #1's type: sql/driver: value 4294967295 overflows int32"},
+		{[]interface{}{"Brad", "strconv fail"}, "sql: converting Exec argument #1's type: sql/driver: value \"strconv fail\" can't be converted to int32"},
 
 		// Wrong number of args:
-		{[]interface{}{}, "db: expected 2 arguments, got 0"},
-		{[]interface{}{1, 2, 3}, "db: expected 2 arguments, got 3"},
+		{[]interface{}{}, "sql: expected 2 arguments, got 0"},
+		{[]interface{}{1, 2, 3}, "sql: expected 2 arguments, got 3"},
 	}
 	for n, et := range execTests {
 		_, err := stmt.Exec(et.args...)
diff --git a/libgo/go/exp/ssh/client_auth.go b/libgo/go/exp/ssh/client_auth.go
index 1a382357b46..3a7e9fb9801 100644
--- a/libgo/go/exp/ssh/client_auth.go
+++ b/libgo/go/exp/ssh/client_auth.go
@@ -283,8 +283,8 @@ func (p *publickeyAuth) method() string {
 	return "publickey"
 }
 
-// ClientAuthPublickey returns a ClientAuth using public key authentication.
-func ClientAuthPublickey(impl ClientKeyring) ClientAuth {
+// ClientAuthKeyring returns a ClientAuth using public key authentication.
+func ClientAuthKeyring(impl ClientKeyring) ClientAuth {
 	return &publickeyAuth{impl}
 }
 
diff --git a/libgo/go/exp/ssh/client_auth_test.go b/libgo/go/exp/ssh/client_auth_test.go
index 2b89e9728c7..c41a93b5c7d 100644
--- a/libgo/go/exp/ssh/client_auth_test.go
+++ b/libgo/go/exp/ssh/client_auth_test.go
@@ -122,7 +122,7 @@ var (
 		PasswordCallback: func(user, pass string) bool {
 			return user == "testuser" && pass == string(clientPassword)
 		},
-		PubKeyCallback: func(user, algo string, pubkey []byte) bool {
+		PublicKeyCallback: func(user, algo string, pubkey []byte) bool {
 			key := clientKeychain.keys[0].(*rsa.PrivateKey).PublicKey
 			expected := []byte(serializePublickey(key))
 			algoname := algoName(key)
@@ -179,7 +179,7 @@ func TestClientAuthPublickey(t *testing.T) {
 	config := &ClientConfig{
 		User: "testuser",
 		Auth: []ClientAuth{
-			ClientAuthPublickey(clientKeychain),
+			ClientAuthKeyring(clientKeychain),
 		},
 	}
 	c, err := Dial("tcp", newMockAuthServer(t), config)
@@ -210,7 +210,7 @@ func TestClientAuthWrongPassword(t *testing.T) {
 		User: "testuser",
 		Auth: []ClientAuth{
 			ClientAuthPassword(wrongPw),
-			ClientAuthPublickey(clientKeychain),
+			ClientAuthKeyring(clientKeychain),
 		},
 	}
 
@@ -228,7 +228,7 @@ func TestClientAuthInvalidPublickey(t *testing.T) {
 	config := &ClientConfig{
 		User: "testuser",
 		Auth: []ClientAuth{
-			ClientAuthPublickey(kc),
+			ClientAuthKeyring(kc),
 		},
 	}
 
@@ -246,7 +246,7 @@ func TestClientAuthRSAandDSA(t *testing.T) {
 	config := &ClientConfig{
 		User: "testuser",
 		Auth: []ClientAuth{
-			ClientAuthPublickey(kc),
+			ClientAuthKeyring(kc),
 		},
 	}
 	c, err := Dial("tcp", newMockAuthServer(t), config)
diff --git a/libgo/go/exp/ssh/client_func_test.go b/libgo/go/exp/ssh/client_func_test.go
index 24e3a6334e5..b4bdba95396 100644
--- a/libgo/go/exp/ssh/client_func_test.go
+++ b/libgo/go/exp/ssh/client_func_test.go
@@ -50,7 +50,7 @@ func TestFuncPublickeyAuth(t *testing.T) {
 	config := &ClientConfig{
 		User: *sshuser,
 		Auth: []ClientAuth{
-			ClientAuthPublickey(kc),
+			ClientAuthKeyring(kc),
 		},
 	}
 	conn, err := Dial("tcp", "localhost:22", config)
diff --git a/libgo/go/exp/ssh/server.go b/libgo/go/exp/ssh/server.go
index 1eee9a4a977..31011c66176 100644
--- a/libgo/go/exp/ssh/server.go
+++ b/libgo/go/exp/ssh/server.go
@@ -36,10 +36,10 @@ type ServerConfig struct {
 	// several goroutines.
 	PasswordCallback func(user, password string) bool
 
-	// PubKeyCallback, if non-nil, is called when a client attempts public
+	// PublicKeyCallback, if non-nil, is called when a client attempts public
 	// key authentication. It must return true iff the given public key is
 	// valid for the given user.
-	PubKeyCallback func(user, algo string, pubkey []byte) bool
+	PublicKeyCallback func(user, algo string, pubkey []byte) bool
 
 	// Cryptographic-related configuration.
 	Crypto CryptoConfig
@@ -359,7 +359,7 @@ func isAcceptableAlgo(algo string) bool {
 
 // testPubKey returns true if the given public key is acceptable for the user.
 func (s *ServerConn) testPubKey(user, algo string, pubKey []byte) bool {
-	if s.config.PubKeyCallback == nil || !isAcceptableAlgo(algo) {
+	if s.config.PublicKeyCallback == nil || !isAcceptableAlgo(algo) {
 		return false
 	}
 
@@ -369,7 +369,7 @@ func (s *ServerConn) testPubKey(user, algo string, pubKey []byte) bool {
 		}
 	}
 
-	result := s.config.PubKeyCallback(user, algo, pubKey)
+	result := s.config.PublicKeyCallback(user, algo, pubKey)
 	if len(s.cachedPubKeys) < maxCachedPubKeys {
 		c := cachedPubKey{
 			user:   user,
@@ -425,7 +425,7 @@ userAuthLoop:
 				break userAuthLoop
 			}
 		case "publickey":
-			if s.config.PubKeyCallback == nil {
+			if s.config.PublicKeyCallback == nil {
 				break
 			}
 			payload := userAuthReq.Payload
@@ -499,7 +499,7 @@ userAuthLoop:
 		if s.config.PasswordCallback != nil {
 			failureMsg.Methods = append(failureMsg.Methods, "password")
 		}
-		if s.config.PubKeyCallback != nil {
+		if s.config.PublicKeyCallback != nil {
 			failureMsg.Methods = append(failureMsg.Methods, "publickey")
 		}
 
diff --git a/libgo/go/exp/ssh/session.go b/libgo/go/exp/ssh/session.go
index bf9a88e97ef..807dd8740d7 100644
--- a/libgo/go/exp/ssh/session.go
+++ b/libgo/go/exp/ssh/session.go
@@ -68,10 +68,12 @@ type Session struct {
 
 	*clientChan // the channel backing this session
 
-	started        bool // true once Start, Run or Shell is invoked.
-	closeAfterWait []io.Closer
-	copyFuncs      []func() error
-	errch          chan error // one send per copyFunc
+	started   bool // true once Start, Run or Shell is invoked.
+	copyFuncs []func() error
+	errch     chan error // one send per copyFunc
+
+	// true if pipe method is active
+	stdinpipe, stdoutpipe, stderrpipe bool
 }
 
 // RFC 4254 Section 6.4.
@@ -237,11 +239,9 @@ func (s *Session) waitForResponse() error {
 func (s *Session) start() error {
 	s.started = true
 
-	type F func(*Session) error
+	type F func(*Session)
 	for _, setupFd := range []F{(*Session).stdin, (*Session).stdout, (*Session).stderr} {
-		if err := setupFd(s); err != nil {
-			return err
-		}
+		setupFd(s)
 	}
 
 	s.errch = make(chan error, len(s.copyFuncs))
@@ -274,9 +274,6 @@ func (s *Session) Wait() error {
 			copyError = err
 		}
 	}
-	for _, fd := range s.closeAfterWait {
-		fd.Close()
-	}
 	if waitErr != nil {
 		return waitErr
 	}
@@ -341,7 +338,10 @@ func (s *Session) wait() error {
 	return &ExitError{wm}
 }
 
-func (s *Session) stdin() error {
+func (s *Session) stdin() {
+	if s.stdinpipe {
+		return
+	}
 	if s.Stdin == nil {
 		s.Stdin = new(bytes.Buffer)
 	}
@@ -352,10 +352,12 @@ func (s *Session) stdin() error {
 		}
 		return err
 	})
-	return nil
 }
 
-func (s *Session) stdout() error {
+func (s *Session) stdout() {
+	if s.stdoutpipe {
+		return
+	}
 	if s.Stdout == nil {
 		s.Stdout = ioutil.Discard
 	}
@@ -363,10 +365,12 @@ func (s *Session) stdout() error {
 		_, err := io.Copy(s.Stdout, s.clientChan.stdout)
 		return err
 	})
-	return nil
 }
 
-func (s *Session) stderr() error {
+func (s *Session) stderr() {
+	if s.stderrpipe {
+		return
+	}
 	if s.Stderr == nil {
 		s.Stderr = ioutil.Discard
 	}
@@ -374,7 +378,6 @@ func (s *Session) stderr() error {
 		_, err := io.Copy(s.Stderr, s.clientChan.stderr)
 		return err
 	})
-	return nil
 }
 
 // StdinPipe returns a pipe that will be connected to the
@@ -386,10 +389,8 @@ func (s *Session) StdinPipe() (io.WriteCloser, error) {
 	if s.started {
 		return nil, errors.New("ssh: StdinPipe after process started")
 	}
-	pr, pw := io.Pipe()
-	s.Stdin = pr
-	s.closeAfterWait = append(s.closeAfterWait, pr)
-	return pw, nil
+	s.stdinpipe = true
+	return s.clientChan.stdin, nil
 }
 
 // StdoutPipe returns a pipe that will be connected to the
@@ -398,17 +399,15 @@ func (s *Session) StdinPipe() (io.WriteCloser, error) {
 // stdout and stderr streams. If the StdoutPipe reader is
 // not serviced fast enought it may eventually cause the
 // remote command to block.
-func (s *Session) StdoutPipe() (io.ReadCloser, error) {
+func (s *Session) StdoutPipe() (io.Reader, error) {
 	if s.Stdout != nil {
 		return nil, errors.New("ssh: Stdout already set")
 	}
 	if s.started {
 		return nil, errors.New("ssh: StdoutPipe after process started")
 	}
-	pr, pw := io.Pipe()
-	s.Stdout = pw
-	s.closeAfterWait = append(s.closeAfterWait, pw)
-	return pr, nil
+	s.stdoutpipe = true
+	return s.clientChan.stdout, nil
 }
 
 // StderrPipe returns a pipe that will be connected to the
@@ -417,17 +416,15 @@ func (s *Session) StdoutPipe() (io.ReadCloser, error) {
 // stdout and stderr streams. If the StderrPipe reader is
 // not serviced fast enought it may eventually cause the
 // remote command to block.
-func (s *Session) StderrPipe() (io.ReadCloser, error) {
+func (s *Session) StderrPipe() (io.Reader, error) {
 	if s.Stderr != nil {
 		return nil, errors.New("ssh: Stderr already set")
 	}
 	if s.started {
 		return nil, errors.New("ssh: StderrPipe after process started")
 	}
-	pr, pw := io.Pipe()
-	s.Stderr = pw
-	s.closeAfterWait = append(s.closeAfterWait, pw)
-	return pr, nil
+	s.stderrpipe = true
+	return s.clientChan.stderr, nil
 }
 
 // TODO(dfc) add Output and CombinedOutput helpers
diff --git a/libgo/go/exp/ssh/session_test.go b/libgo/go/exp/ssh/session_test.go
index a28ead08736..2882620b0ba 100644
--- a/libgo/go/exp/ssh/session_test.go
+++ b/libgo/go/exp/ssh/session_test.go
@@ -20,7 +20,7 @@ func dial(handler serverType, t *testing.T) *ClientConn {
 	serverConfig.PasswordCallback = func(user, pass string) bool {
 		return user == "testuser" && pass == string(pw)
 	}
-	serverConfig.PubKeyCallback = nil
+	serverConfig.PublicKeyCallback = nil
 
 	l, err := Listen("tcp", "127.0.0.1:0", serverConfig)
 	if err != nil {
diff --git a/libgo/go/exp/ssh/tcpip.go b/libgo/go/exp/ssh/tcpip.go
index a85044ace9c..bee41eeb0db 100644
--- a/libgo/go/exp/ssh/tcpip.go
+++ b/libgo/go/exp/ssh/tcpip.go
@@ -10,6 +10,7 @@ import (
 	"io"
 	"net"
 )
+
 // Dial initiates a connection to the addr from the remote host.
 // addr is resolved using net.ResolveTCPAddr before connection. 
 // This could allow an observer to observe the DNS name of the 
diff --git a/libgo/go/exp/terminal/terminal.go b/libgo/go/exp/terminal/terminal.go
index 18d76cd6b90..809e88cacfa 100644
--- a/libgo/go/exp/terminal/terminal.go
+++ b/libgo/go/exp/terminal/terminal.go
@@ -2,13 +2,56 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+
 package terminal
 
-import "io"
+import (
+	"io"
+	"sync"
+)
+
+// EscapeCodes contains escape sequences that can be written to the terminal in
+// order to achieve different styles of text.
+type EscapeCodes struct {
+	// Foreground colors
+	Black, Red, Green, Yellow, Blue, Magenta, Cyan, White []byte
+
+	// Reset all attributes
+	Reset []byte
+}
+
+var vt100EscapeCodes = EscapeCodes{
+	Black:   []byte{keyEscape, '[', '3', '0', 'm'},
+	Red:     []byte{keyEscape, '[', '3', '1', 'm'},
+	Green:   []byte{keyEscape, '[', '3', '2', 'm'},
+	Yellow:  []byte{keyEscape, '[', '3', '3', 'm'},
+	Blue:    []byte{keyEscape, '[', '3', '4', 'm'},
+	Magenta: []byte{keyEscape, '[', '3', '5', 'm'},
+	Cyan:    []byte{keyEscape, '[', '3', '6', 'm'},
+	White:   []byte{keyEscape, '[', '3', '7', 'm'},
+
+	Reset: []byte{keyEscape, '[', '0', 'm'},
+}
 
 // Terminal contains the state for running a VT100 terminal that is capable of
 // reading lines of input.
 type Terminal struct {
+	// AutoCompleteCallback, if non-null, is called for each keypress
+	// with the full input line and the current position of the cursor.
+	// If it returns a nil newLine, the key press is processed normally.
+	// Otherwise it returns a replacement line and the new cursor position.
+	AutoCompleteCallback func(line []byte, pos, key int) (newLine []byte, newPos int)
+
+	// Escape contains a pointer to the escape codes for this terminal.
+	// It's always a valid pointer, although the escape codes themselves
+	// may be empty if the terminal doesn't support them.
+	Escape *EscapeCodes
+
+	// lock protects the terminal and the state in this object from
+	// concurrent processing of a key press and a Write() call.
+	lock sync.Mutex
+
 	c      io.ReadWriter
 	prompt string
 
@@ -16,6 +59,8 @@ type Terminal struct {
 	line []byte
 	// pos is the logical position of the cursor in line
 	pos int
+	// echo is true if local echo is enabled
+	echo bool
 
 	// cursorX contains the current X value of the cursor where the left
 	// edge is 0. cursorY contains the row number where the first row of
@@ -40,10 +85,12 @@ type Terminal struct {
 // "> ").
 func NewTerminal(c io.ReadWriter, prompt string) *Terminal {
 	return &Terminal{
+		Escape:     &vt100EscapeCodes,
 		c:          c,
 		prompt:     prompt,
 		termWidth:  80,
 		termHeight: 24,
+		echo:       true,
 	}
 }
 
@@ -109,18 +156,11 @@ func bytesToKey(b []byte) (int, []byte) {
 
 // queue appends data to the end of t.outBuf
 func (t *Terminal) queue(data []byte) {
-	if len(t.outBuf)+len(data) > cap(t.outBuf) {
-		newOutBuf := make([]byte, len(t.outBuf), 2*(len(t.outBuf)+len(data)))
-		copy(newOutBuf, t.outBuf)
-		t.outBuf = newOutBuf
-	}
-
-	oldLen := len(t.outBuf)
-	t.outBuf = t.outBuf[:len(t.outBuf)+len(data)]
-	copy(t.outBuf[oldLen:], data)
+	t.outBuf = append(t.outBuf, data...)
 }
 
 var eraseUnderCursor = []byte{' ', keyEscape, '[', 'D'}
+var space = []byte{' '}
 
 func isPrintable(key int) bool {
 	return key >= 32 && key < 127
@@ -129,6 +169,10 @@ func isPrintable(key int) bool {
 // moveCursorToPos appends data to t.outBuf which will move the cursor to the
 // given, logical position in the text.
 func (t *Terminal) moveCursorToPos(pos int) {
+	if !t.echo {
+		return
+	}
+
 	x := len(t.prompt) + pos
 	y := x / t.termWidth
 	x = x % t.termWidth
@@ -153,6 +197,12 @@ func (t *Terminal) moveCursorToPos(pos int) {
 		right = x - t.cursorX
 	}
 
+	t.cursorX = x
+	t.cursorY = y
+	t.move(up, down, left, right)
+}
+
+func (t *Terminal) move(up, down, left, right int) {
 	movement := make([]byte, 3*(up+down+left+right))
 	m := movement
 	for i := 0; i < up; i++ {
@@ -180,11 +230,14 @@ func (t *Terminal) moveCursorToPos(pos int) {
 		m = m[3:]
 	}
 
-	t.cursorX = x
-	t.cursorY = y
 	t.queue(movement)
 }
 
+func (t *Terminal) clearLineToRight() {
+	op := []byte{keyEscape, '[', 'K'}
+	t.queue(op)
+}
+
 const maxLineLength = 4096
 
 // handleKey processes the given key and, optionally, returns a line of text
@@ -196,12 +249,15 @@ func (t *Terminal) handleKey(key int) (line string, ok bool) {
 			return
 		}
 		t.pos--
+		t.moveCursorToPos(t.pos)
 
 		copy(t.line[t.pos:], t.line[1+t.pos:])
 		t.line = t.line[:len(t.line)-1]
-		t.writeLine(t.line[t.pos:])
-		t.moveCursorToPos(t.pos)
+		if t.echo {
+			t.writeLine(t.line[t.pos:])
+		}
 		t.queue(eraseUnderCursor)
+		t.moveCursorToPos(t.pos)
 	case keyAltLeft:
 		// move left by a word.
 		if t.pos == 0 {
@@ -260,6 +316,25 @@ func (t *Terminal) handleKey(key int) (line string, ok bool) {
 		t.cursorY = 0
 		t.maxLine = 0
 	default:
+		if t.AutoCompleteCallback != nil {
+			t.lock.Unlock()
+			newLine, newPos := t.AutoCompleteCallback(t.line, t.pos, key)
+			t.lock.Lock()
+
+			if newLine != nil {
+				if t.echo {
+					t.moveCursorToPos(0)
+					t.writeLine(newLine)
+					for i := len(newLine); i < len(t.line); i++ {
+						t.writeLine(space)
+					}
+					t.moveCursorToPos(newPos)
+				}
+				t.line = newLine
+				t.pos = newPos
+				return
+			}
+		}
 		if !isPrintable(key) {
 			return
 		}
@@ -274,7 +349,9 @@ func (t *Terminal) handleKey(key int) (line string, ok bool) {
 		t.line = t.line[:len(t.line)+1]
 		copy(t.line[t.pos+1:], t.line[t.pos:])
 		t.line[t.pos] = byte(key)
-		t.writeLine(t.line[t.pos:])
+		if t.echo {
+			t.writeLine(t.line[t.pos:])
+		}
 		t.pos++
 		t.moveCursorToPos(t.pos)
 	}
@@ -283,15 +360,6 @@ func (t *Terminal) handleKey(key int) (line string, ok bool) {
 
 func (t *Terminal) writeLine(line []byte) {
 	for len(line) != 0 {
-		if t.cursorX == t.termWidth {
-			t.queue([]byte("\r\n"))
-			t.cursorX = 0
-			t.cursorY++
-			if t.cursorY > t.maxLine {
-				t.maxLine = t.cursorY
-			}
-		}
-
 		remainingOnLine := t.termWidth - t.cursorX
 		todo := len(line)
 		if todo > remainingOnLine {
@@ -300,16 +368,95 @@ func (t *Terminal) writeLine(line []byte) {
 		t.queue(line[:todo])
 		t.cursorX += todo
 		line = line[todo:]
+
+		if t.cursorX == t.termWidth {
+			t.cursorX = 0
+			t.cursorY++
+			if t.cursorY > t.maxLine {
+				t.maxLine = t.cursorY
+			}
+		}
 	}
 }
 
 func (t *Terminal) Write(buf []byte) (n int, err error) {
-	return t.c.Write(buf)
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	if t.cursorX == 0 && t.cursorY == 0 {
+		// This is the easy case: there's nothing on the screen that we
+		// have to move out of the way.
+		return t.c.Write(buf)
+	}
+
+	// We have a prompt and possibly user input on the screen. We
+	// have to clear it first.
+	t.move(0, /* up */ 0, /* down */ t.cursorX, /* left */ 0 /* right */ )
+	t.cursorX = 0
+	t.clearLineToRight()
+
+	for t.cursorY > 0 {
+		t.move(1, /* up */ 0, 0, 0)
+		t.cursorY--
+		t.clearLineToRight()
+	}
+
+	if _, err = t.c.Write(t.outBuf); err != nil {
+		return
+	}
+	t.outBuf = t.outBuf[:0]
+
+	if n, err = t.c.Write(buf); err != nil {
+		return
+	}
+
+	t.queue([]byte(t.prompt))
+	chars := len(t.prompt)
+	if t.echo {
+		t.queue(t.line)
+		chars += len(t.line)
+	}
+	t.cursorX = chars % t.termWidth
+	t.cursorY = chars / t.termWidth
+	t.moveCursorToPos(t.pos)
+
+	if _, err = t.c.Write(t.outBuf); err != nil {
+		return
+	}
+	t.outBuf = t.outBuf[:0]
+	return
+}
+
+// ReadPassword temporarily changes the prompt and reads a password, without
+// echo, from the terminal.
+func (t *Terminal) ReadPassword(prompt string) (line string, err error) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	oldPrompt := t.prompt
+	t.prompt = prompt
+	t.echo = false
+
+	line, err = t.readLine()
+
+	t.prompt = oldPrompt
+	t.echo = true
+
+	return
 }
 
 // ReadLine returns a line of input from the terminal.
 func (t *Terminal) ReadLine() (line string, err error) {
-	if t.cursorX == 0 {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	return t.readLine()
+}
+
+func (t *Terminal) readLine() (line string, err error) {
+	// t.lock must be held at this point
+
+	if t.cursorX == 0 && t.cursorY == 0 {
 		t.writeLine([]byte(t.prompt))
 		t.c.Write(t.outBuf)
 		t.outBuf = t.outBuf[:0]
@@ -320,7 +467,11 @@ func (t *Terminal) ReadLine() (line string, err error) {
 		// containing a partial key sequence
 		readBuf := t.inBuf[len(t.remainder):]
 		var n int
+
+		t.lock.Unlock()
 		n, err = t.c.Read(readBuf)
+		t.lock.Lock()
+
 		if err != nil {
 			return
 		}
@@ -358,5 +509,8 @@ func (t *Terminal) ReadLine() (line string, err error) {
 }
 
 func (t *Terminal) SetSize(width, height int) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
 	t.termWidth, t.termHeight = width, height
 }
diff --git a/libgo/go/exp/terminal/terminal_test.go b/libgo/go/exp/terminal/terminal_test.go
index a2197210e2a..75628f695e9 100644
--- a/libgo/go/exp/terminal/terminal_test.go
+++ b/libgo/go/exp/terminal/terminal_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+
 package terminal
 
 import (
diff --git a/libgo/go/exp/terminal/util.go b/libgo/go/exp/terminal/util.go
index 03035673869..a5bbfca3b46 100644
--- a/libgo/go/exp/terminal/util.go
+++ b/libgo/go/exp/terminal/util.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+
 // Package terminal provides support functions for dealing with terminals, as
 // commonly found on UNIX systems.
 //
@@ -9,7 +11,7 @@
 //
 // 	oldState, err := terminal.MakeRaw(0)
 // 	if err != nil {
-// 	        panic(err.String())
+// 	        panic(err)
 // 	}
 // 	defer terminal.Restore(0, oldState)
 package terminal
@@ -17,6 +19,7 @@ package terminal
 import (
 	"io"
 	"syscall"
+	"unsafe"
 )
 
 // State contains the state of a terminal.
@@ -57,6 +60,18 @@ func Restore(fd int, state *State) error {
 	return err
 }
 
+func ioctl(int, int, unsafe.Pointer) int __asm__("ioctl")
+
+// GetSize returns the dimensions of the given terminal.
+func GetSize(fd int) (width, height int, err error) {
+	var dimensions [4]uint16
+
+	if ioctl(fd, syscall.TIOCGWINSZ, unsafe.Pointer(&dimensions)) < 0 {
+		return -1, -1, syscall.GetErrno()
+	}
+	return int(dimensions[1]), int(dimensions[0]), nil
+}
+
 // ReadPassword reads a line of input from a terminal without local echo.  This
 // is commonly used for inputting passwords and other sensitive data. The slice
 // returned does not include the \n.
diff --git a/libgo/go/exp/winfsnotify/winfsnotify.go b/libgo/go/exp/winfsnotify/winfsnotify.go
index d47ffd13921..a6e3a6a8fb7 100644
--- a/libgo/go/exp/winfsnotify/winfsnotify.go
+++ b/libgo/go/exp/winfsnotify/winfsnotify.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 // Package winfsnotify allows the user to receive
 // file system event notifications on Windows.
 package winfsnotify
diff --git a/libgo/go/exp/winfsnotify/winfsnotify_test.go b/libgo/go/exp/winfsnotify/winfsnotify_test.go
index b9c43d9c006..59ac1624a26 100644
--- a/libgo/go/exp/winfsnotify/winfsnotify_test.go
+++ b/libgo/go/exp/winfsnotify/winfsnotify_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package winfsnotify
 
 import (
diff --git a/libgo/go/exp/wingui/gui.go b/libgo/go/exp/wingui/gui.go
index d58421bcfa7..3b79873fa2b 100644
--- a/libgo/go/exp/wingui/gui.go
+++ b/libgo/go/exp/wingui/gui.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package main
 
 import (
diff --git a/libgo/go/exp/wingui/winapi.go b/libgo/go/exp/wingui/winapi.go
index 24f3dd4d723..f876088e91f 100644
--- a/libgo/go/exp/wingui/winapi.go
+++ b/libgo/go/exp/wingui/winapi.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package main
 
 import (
diff --git a/libgo/go/exp/wingui/zwinapi.go b/libgo/go/exp/wingui/zwinapi.go
index b062ca3372e..5666c6de530 100644
--- a/libgo/go/exp/wingui/zwinapi.go
+++ b/libgo/go/exp/wingui/zwinapi.go
@@ -1,3 +1,4 @@
+// +build windows
 // mksyscall_windows.pl winapi.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
diff --git a/libgo/go/fmt/fmt_test.go b/libgo/go/fmt/fmt_test.go
index d7fe296f095..d34a4f8fd2d 100644
--- a/libgo/go/fmt/fmt_test.go
+++ b/libgo/go/fmt/fmt_test.go
@@ -506,78 +506,42 @@ func BenchmarkSprintfFloat(b *testing.B) {
 	}
 }
 
+var mallocBuf bytes.Buffer
+
+var mallocTest = []struct {
+	count int
+	desc  string
+	fn    func()
+}{
+	{0, `Sprintf("")`, func() { Sprintf("") }},
+	{1, `Sprintf("xxx")`, func() { Sprintf("xxx") }},
+	{1, `Sprintf("%x")`, func() { Sprintf("%x", 7) }},
+	{2, `Sprintf("%s")`, func() { Sprintf("%s", "hello") }},
+	{1, `Sprintf("%x %x")`, func() { Sprintf("%x", 7, 112) }},
+	{1, `Sprintf("%g")`, func() { Sprintf("%g", 3.14159) }},
+	{0, `Fprintf(buf, "%x %x %x")`, func() { mallocBuf.Reset(); Fprintf(&mallocBuf, "%x %x %x", 7, 8, 9) }},
+	{1, `Fprintf(buf, "%s")`, func() { mallocBuf.Reset(); Fprintf(&mallocBuf, "%s", "hello") }},
+}
+
+var _ bytes.Buffer
+
 func TestCountMallocs(t *testing.T) {
 	if testing.Short() {
 		return
 	}
-	const N = 100
-	runtime.UpdateMemStats()
-	mallocs := 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		Sprintf("")
+	for _, mt := range mallocTest {
+		const N = 100
+		runtime.UpdateMemStats()
+		mallocs := 0 - runtime.MemStats.Mallocs
+		for i := 0; i < N; i++ {
+			mt.fn()
+		}
+		runtime.UpdateMemStats()
+		mallocs += runtime.MemStats.Mallocs
+		if mallocs/N != uint64(mt.count) {
+			t.Errorf("%s: expected %d mallocs, got %d", mt.desc, mt.count, mallocs/N)
+		}
 	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Sprintf(\"\"): %d\n", mallocs/N)
-	runtime.UpdateMemStats()
-	mallocs = 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		Sprintf("xxx")
-	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Sprintf(\"xxx\"): %d\n", mallocs/N)
-	runtime.UpdateMemStats()
-	mallocs = 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		Sprintf("%x", i)
-	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Sprintf(\"%%x\"): %d\n", mallocs/N)
-	runtime.UpdateMemStats()
-	mallocs = 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		Sprintf("%s", "hello")
-	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Sprintf(\"%%s\"): %d\n", mallocs/N)
-	runtime.UpdateMemStats()
-	mallocs = 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		Sprintf("%x %x", i, i)
-	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Sprintf(\"%%x %%x\"): %d\n", mallocs/N)
-	runtime.UpdateMemStats()
-	mallocs = 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		Sprintf("%g", 3.14159)
-	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Sprintf(\"%%g\"): %d\n", mallocs/N)
-	buf := new(bytes.Buffer)
-	runtime.UpdateMemStats()
-	mallocs = 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		buf.Reset()
-		Fprintf(buf, "%x %x %x", i, i, i)
-	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Fprintf(buf, \"%%x %%x %%x\"): %d\n", mallocs/N)
-	runtime.UpdateMemStats()
-	mallocs = 0 - runtime.MemStats.Mallocs
-	for i := 0; i < N; i++ {
-		buf.Reset()
-		Fprintf(buf, "%s", "hello")
-	}
-	runtime.UpdateMemStats()
-	mallocs += runtime.MemStats.Mallocs
-	Printf("mallocs per Fprintf(buf, \"%%s\"): %d\n", mallocs/N)
 }
 
 type flagPrinter struct{}
diff --git a/libgo/go/fmt/format.go b/libgo/go/fmt/format.go
index 5f62c067f06..78d9e998b1f 100644
--- a/libgo/go/fmt/format.go
+++ b/libgo/go/fmt/format.go
@@ -154,12 +154,17 @@ func putint(buf []byte, base, val uint64, digits string) int {
 	return i - 1
 }
 
+var (
+	trueBytes  = []byte("true")
+	falseBytes = []byte("false")
+)
+
 // fmt_boolean formats a boolean.
 func (f *fmt) fmt_boolean(v bool) {
 	if v {
-		f.padString("true")
+		f.pad(trueBytes)
 	} else {
-		f.padString("false")
+		f.pad(falseBytes)
 	}
 }
 
@@ -283,31 +288,18 @@ func (f *fmt) fmt_s(s string) {
 }
 
 // fmt_sx formats a string as a hexadecimal encoding of its bytes.
-func (f *fmt) fmt_sx(s string) {
-	t := ""
+func (f *fmt) fmt_sx(s, digits string) {
+	// TODO: Avoid buffer by pre-padding.
+	var b bytes.Buffer
 	for i := 0; i < len(s); i++ {
 		if i > 0 && f.space {
-			t += " "
+			b.WriteByte(' ')
 		}
 		v := s[i]
-		t += string(ldigits[v>>4])
-		t += string(ldigits[v&0xF])
+		b.WriteByte(digits[v>>4])
+		b.WriteByte(digits[v&0xF])
 	}
-	f.padString(t)
-}
-
-// fmt_sX formats a string as an uppercase hexadecimal encoding of its bytes.
-func (f *fmt) fmt_sX(s string) {
-	t := ""
-	for i := 0; i < len(s); i++ {
-		if i > 0 && f.space {
-			t += " "
-		}
-		v := s[i]
-		t += string(udigits[v>>4])
-		t += string(udigits[v&0xF])
-	}
-	f.padString(t)
+	f.pad(b.Bytes())
 }
 
 // fmt_q formats a string as a double-quoted, escaped Go string constant.
@@ -329,13 +321,13 @@ func (f *fmt) fmt_q(s string) {
 // fmt_qc formats the integer as a single-quoted, escaped Go character constant.
 // If the character is not valid Unicode, it will print '\ufffd'.
 func (f *fmt) fmt_qc(c int64) {
-	var quoted string
+	var quoted []byte
 	if f.plus {
-		quoted = strconv.QuoteRuneToASCII(rune(c))
+		quoted = strconv.AppendQuoteRuneToASCII(f.intbuf[0:0], rune(c))
 	} else {
-		quoted = strconv.QuoteRune(rune(c))
+		quoted = strconv.AppendQuoteRune(f.intbuf[0:0], rune(c))
 	}
-	f.padString(quoted)
+	f.pad(quoted)
 }
 
 // floating-point
@@ -347,57 +339,70 @@ func doPrec(f *fmt, def int) int {
 	return def
 }
 
-// Add a plus sign or space to the floating-point string representation if missing and required.
-func (f *fmt) plusSpace(s string) {
-	if s[0] != '-' {
+// formatFloat formats a float64; it is an efficient equivalent to  f.pad(strconv.FormatFloat()...).
+func (f *fmt) formatFloat(v float64, verb byte, prec, n int) {
+	// We leave one byte at the beginning of f.intbuf for a sign if needed,
+	// and make it a space, which we might be able to use.
+	f.intbuf[0] = ' '
+	slice := strconv.AppendFloat(f.intbuf[0:1], v, verb, prec, n)
+	// Add a plus sign or space to the floating-point string representation if missing and required.
+	// The formatted number starts at slice[1].
+	switch slice[1] {
+	case '-', '+':
+		// We're set; drop the leading space.
+		slice = slice[1:]
+	default:
+		// There's no sign, but we might need one.
 		if f.plus {
-			s = "+" + s
+			slice[0] = '+'
 		} else if f.space {
-			s = " " + s
+			// space is already there
+		} else {
+			slice = slice[1:]
 		}
 	}
-	f.padString(s)
+	f.pad(slice)
 }
 
 // fmt_e64 formats a float64 in the form -1.23e+12.
-func (f *fmt) fmt_e64(v float64) { f.plusSpace(strconv.FormatFloat(v, 'e', doPrec(f, 6), 64)) }
+func (f *fmt) fmt_e64(v float64) { f.formatFloat(v, 'e', doPrec(f, 6), 64) }
 
 // fmt_E64 formats a float64 in the form -1.23E+12.
-func (f *fmt) fmt_E64(v float64) { f.plusSpace(strconv.FormatFloat(v, 'E', doPrec(f, 6), 64)) }
+func (f *fmt) fmt_E64(v float64) { f.formatFloat(v, 'E', doPrec(f, 6), 64) }
 
 // fmt_f64 formats a float64 in the form -1.23.
-func (f *fmt) fmt_f64(v float64) { f.plusSpace(strconv.FormatFloat(v, 'f', doPrec(f, 6), 64)) }
+func (f *fmt) fmt_f64(v float64) { f.formatFloat(v, 'f', doPrec(f, 6), 64) }
 
 // fmt_g64 formats a float64 in the 'f' or 'e' form according to size.
-func (f *fmt) fmt_g64(v float64) { f.plusSpace(strconv.FormatFloat(v, 'g', doPrec(f, -1), 64)) }
+func (f *fmt) fmt_g64(v float64) { f.formatFloat(v, 'g', doPrec(f, -1), 64) }
 
 // fmt_g64 formats a float64 in the 'f' or 'E' form according to size.
-func (f *fmt) fmt_G64(v float64) { f.plusSpace(strconv.FormatFloat(v, 'G', doPrec(f, -1), 64)) }
+func (f *fmt) fmt_G64(v float64) { f.formatFloat(v, 'G', doPrec(f, -1), 64) }
 
 // fmt_fb64 formats a float64 in the form -123p3 (exponent is power of 2).
-func (f *fmt) fmt_fb64(v float64) { f.plusSpace(strconv.FormatFloat(v, 'b', 0, 64)) }
+func (f *fmt) fmt_fb64(v float64) { f.formatFloat(v, 'b', 0, 64) }
 
 // float32
 // cannot defer to float64 versions
 // because it will get rounding wrong in corner cases.
 
 // fmt_e32 formats a float32 in the form -1.23e+12.
-func (f *fmt) fmt_e32(v float32) { f.plusSpace(strconv.FormatFloat(float64(v), 'e', doPrec(f, 6), 32)) }
+func (f *fmt) fmt_e32(v float32) { f.formatFloat(float64(v), 'e', doPrec(f, 6), 32) }
 
 // fmt_E32 formats a float32 in the form -1.23E+12.
-func (f *fmt) fmt_E32(v float32) { f.plusSpace(strconv.FormatFloat(float64(v), 'E', doPrec(f, 6), 32)) }
+func (f *fmt) fmt_E32(v float32) { f.formatFloat(float64(v), 'E', doPrec(f, 6), 32) }
 
 // fmt_f32 formats a float32 in the form -1.23.
-func (f *fmt) fmt_f32(v float32) { f.plusSpace(strconv.FormatFloat(float64(v), 'f', doPrec(f, 6), 32)) }
+func (f *fmt) fmt_f32(v float32) { f.formatFloat(float64(v), 'f', doPrec(f, 6), 32) }
 
 // fmt_g32 formats a float32 in the 'f' or 'e' form according to size.
-func (f *fmt) fmt_g32(v float32) { f.plusSpace(strconv.FormatFloat(float64(v), 'g', doPrec(f, -1), 32)) }
+func (f *fmt) fmt_g32(v float32) { f.formatFloat(float64(v), 'g', doPrec(f, -1), 32) }
 
 // fmt_G32 formats a float32 in the 'f' or 'E' form according to size.
-func (f *fmt) fmt_G32(v float32) { f.plusSpace(strconv.FormatFloat(float64(v), 'G', doPrec(f, -1), 32)) }
+func (f *fmt) fmt_G32(v float32) { f.formatFloat(float64(v), 'G', doPrec(f, -1), 32) }
 
 // fmt_fb32 formats a float32 in the form -123p3 (exponent is power of 2).
-func (f *fmt) fmt_fb32(v float32) { f.padString(strconv.FormatFloat(float64(v), 'b', 0, 32)) }
+func (f *fmt) fmt_fb32(v float32) { f.formatFloat(float64(v), 'b', 0, 32) }
 
 // fmt_c64 formats a complex64 according to the verb.
 func (f *fmt) fmt_c64(v complex64, verb rune) {
diff --git a/libgo/go/fmt/print.go b/libgo/go/fmt/print.go
index 9f157daaee0..3b7d3464e20 100644
--- a/libgo/go/fmt/print.go
+++ b/libgo/go/fmt/print.go
@@ -503,9 +503,9 @@ func (p *pp) fmtString(v string, verb rune, goSyntax bool) {
 	case 's':
 		p.fmt.fmt_s(v)
 	case 'x':
-		p.fmt.fmt_sx(v)
+		p.fmt.fmt_sx(v, ldigits)
 	case 'X':
-		p.fmt.fmt_sX(v)
+		p.fmt.fmt_sx(v, udigits)
 	case 'q':
 		p.fmt.fmt_q(v)
 	default:
@@ -542,9 +542,9 @@ func (p *pp) fmtBytes(v []byte, verb rune, goSyntax bool, depth int) {
 	case 's':
 		p.fmt.fmt_s(s)
 	case 'x':
-		p.fmt.fmt_sx(s)
+		p.fmt.fmt_sx(s, ldigits)
 	case 'X':
-		p.fmt.fmt_sX(s)
+		p.fmt.fmt_sx(s, udigits)
 	case 'q':
 		p.fmt.fmt_q(s)
 	default:
diff --git a/libgo/go/go/ast/scope.go b/libgo/go/go/ast/scope.go
index 92e36698081..fbe4779671e 100644
--- a/libgo/go/go/ast/scope.go
+++ b/libgo/go/go/ast/scope.go
@@ -80,7 +80,7 @@ func (s *Scope) String() string {
 type Object struct {
 	Kind ObjKind
 	Name string      // declared name
-	Decl interface{} // corresponding Field, XxxSpec, FuncDecl, or LabeledStmt; or nil
+	Decl interface{} // corresponding Field, XxxSpec, FuncDecl, LabeledStmt, or AssignStmt; or nil
 	Data interface{} // object-specific data; or nil
 	Type interface{} // place holder for type information; may be nil
 }
@@ -125,6 +125,12 @@ func (obj *Object) Pos() token.Pos {
 		if d.Label.Name == name {
 			return d.Label.Pos()
 		}
+	case *AssignStmt:
+		for _, x := range d.Lhs {
+			if ident, isIdent := x.(*Ident); isIdent && ident.Name == name {
+				return ident.Pos()
+			}
+		}
 	}
 	return token.NoPos
 }
diff --git a/libgo/go/go/build/build_test.go b/libgo/go/go/build/build_test.go
index e22a49aa3d6..fd4030632a9 100644
--- a/libgo/go/go/build/build_test.go
+++ b/libgo/go/go/build/build_test.go
@@ -46,8 +46,9 @@ var buildPkgs = []struct {
 	{
 		"go/build/cgotest",
 		&DirInfo{
-			CgoFiles:    []string{"cgotest.go"},
+			CgoFiles:    ifCgo([]string{"cgotest.go"}),
 			CFiles:      []string{"cgotest.c"},
+			HFiles:      []string{"cgotest.h"},
 			Imports:     []string{"C", "unsafe"},
 			TestImports: []string{},
 			Package:     "cgotest",
@@ -55,6 +56,13 @@ var buildPkgs = []struct {
 	},
 }
 
+func ifCgo(x []string) []string {
+	if DefaultContext.CgoEnabled {
+		return x
+	}
+	return nil
+}
+
 const cmdtestOutput = "3"
 
 func TestBuild(t *testing.T) {
@@ -71,6 +79,10 @@ func TestBuild(t *testing.T) {
 			continue
 		}
 
+		if tt.dir == "go/build/cgotest" && len(info.CgoFiles) == 0 {
+			continue
+		}
+
 		s, err := Build(tree, tt.dir, info)
 		if err != nil {
 			t.Errorf("Build(%#q): %v", tt.dir, err)
diff --git a/libgo/go/go/build/dir.go b/libgo/go/go/build/dir.go
index 2c89224fd4b..265261f22ea 100644
--- a/libgo/go/go/build/dir.go
+++ b/libgo/go/go/build/dir.go
@@ -26,9 +26,9 @@ import (
 
 // A Context specifies the supporting context for a build.
 type Context struct {
-	GOARCH string // target architecture
-	GOOS   string // target operating system
-	// TODO(rsc,adg): GOPATH
+	GOARCH     string // target architecture
+	GOOS       string // target operating system
+	CgoEnabled bool   // whether cgo can be used
 
 	// By default, ScanDir uses the operating system's
 	// file system calls to read directories and files.
@@ -75,9 +75,36 @@ func (ctxt *Context) readFile(dir, file string) (string, []byte, error) {
 // The DefaultContext is the default Context for builds.
 // It uses the GOARCH and GOOS environment variables
 // if set, or else the compiled code's GOARCH and GOOS.
-var DefaultContext = Context{
-	GOARCH: envOr("GOARCH", runtime.GOARCH),
-	GOOS:   envOr("GOOS", runtime.GOOS),
+var DefaultContext = defaultContext()
+
+var cgoEnabled = map[string]bool{
+	"darwin/386":    true,
+	"darwin/amd64":  true,
+	"linux/386":     true,
+	"linux/amd64":   true,
+	"freebsd/386":   true,
+	"freebsd/amd64": true,
+	"windows/386":   true,
+	"windows/amd64": true,
+}
+
+func defaultContext() Context {
+	var c Context
+
+	c.GOARCH = envOr("GOARCH", runtime.GOARCH)
+	c.GOOS = envOr("GOOS", runtime.GOOS)
+
+	s := os.Getenv("CGO_ENABLED")
+	switch s {
+	case "1":
+		c.CgoEnabled = true
+	case "0":
+		c.CgoEnabled = false
+	default:
+		c.CgoEnabled = cgoEnabled[c.GOOS+"/"+c.GOARCH]
+	}
+
+	return c
 }
 
 func envOr(name, def string) string {
@@ -96,8 +123,9 @@ type DirInfo struct {
 
 	// Source files
 	GoFiles  []string // .go files in dir (excluding CgoFiles)
+	HFiles   []string // .h files in dir
 	CFiles   []string // .c files in dir
-	SFiles   []string // .s files in dir
+	SFiles   []string // .s (and, when using cgo, .S files in dir)
 	CgoFiles []string // .go files that import "C"
 
 	// Cgo directives
@@ -135,6 +163,7 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
 		return nil, err
 	}
 
+	var Sfiles []string // files with ".S" (capital S)
 	var di DirInfo
 	imported := make(map[string]bool)
 	testImported := make(map[string]bool)
@@ -154,7 +183,7 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
 
 		ext := path.Ext(name)
 		switch ext {
-		case ".go", ".c", ".s":
+		case ".go", ".c", ".s", ".h", ".S":
 			// tentatively okay
 		default:
 			// skip
@@ -175,9 +204,15 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
 		case ".c":
 			di.CFiles = append(di.CFiles, name)
 			continue
+		case ".h":
+			di.HFiles = append(di.HFiles, name)
+			continue
 		case ".s":
 			di.SFiles = append(di.SFiles, name)
 			continue
+		case ".S":
+			Sfiles = append(Sfiles, name)
+			continue
 		}
 
 		pf, err := parser.ParseFile(fset, filename, data, parser.ImportsOnly|parser.ParseComments)
@@ -256,7 +291,9 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
 			}
 		}
 		if isCgo {
-			di.CgoFiles = append(di.CgoFiles, name)
+			if ctxt.CgoEnabled {
+				di.CgoFiles = append(di.CgoFiles, name)
+			}
 		} else if isTest {
 			if pkg == string(pf.Name.Name) {
 				di.TestGoFiles = append(di.TestGoFiles, name)
@@ -282,6 +319,15 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
 		di.TestImports[i] = p
 		i++
 	}
+
+	// add the .S files only if we are using cgo
+	// (which means gcc will compile them).
+	// The standard assemblers expect .s files.
+	if len(di.CgoFiles) > 0 {
+		di.SFiles = append(di.SFiles, Sfiles...)
+		sort.Strings(di.SFiles)
+	}
+
 	// File name lists are sorted because ReadDir sorts.
 	sort.Strings(di.Imports)
 	sort.Strings(di.TestImports)
@@ -289,7 +335,6 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
 }
 
 var slashslash = []byte("//")
-var plusBuild = []byte("+build")
 
 // shouldBuild reports whether it is okay to use this file,
 // The rule is that in the file's leading run of // comments
@@ -510,14 +555,22 @@ func splitQuoted(s string) (r []string, err error) {
 //
 //	$GOOS
 //	$GOARCH
-//	$GOOS/$GOARCH
+//	cgo (if cgo is enabled)
+//	nocgo (if cgo is disabled)
+//	a slash-separated list of any of these
 //
 func (ctxt *Context) matchOSArch(name string) bool {
+	if ctxt.CgoEnabled && name == "cgo" {
+		return true
+	}
+	if !ctxt.CgoEnabled && name == "nocgo" {
+		return true
+	}
 	if name == ctxt.GOOS || name == ctxt.GOARCH {
 		return true
 	}
 	i := strings.Index(name, "/")
-	return i >= 0 && name[:i] == ctxt.GOOS && name[i+1:] == ctxt.GOARCH
+	return i >= 0 && ctxt.matchOSArch(name[:i]) && ctxt.matchOSArch(name[i+1:])
 }
 
 // goodOSArchFile returns false if the name contains a $GOOS or $GOARCH
diff --git a/libgo/go/go/build/path.go b/libgo/go/go/build/path.go
index 91d6c430a9d..7a281800c28 100644
--- a/libgo/go/go/build/path.go
+++ b/libgo/go/go/build/path.go
@@ -57,7 +57,7 @@ func (t *Tree) PkgDir() string {
 func (t *Tree) BinDir() string {
 	if t.Goroot {
 		if gobin := os.Getenv("GOBIN"); gobin != "" {
-			return gobin
+			return filepath.Clean(gobin)
 		}
 	}
 	return filepath.Join(t.Path, "bin")
@@ -85,8 +85,8 @@ func (t *Tree) HasPkg(pkg string) bool {
 }
 
 var (
-	ErrNotFound     = errors.New("go/build: package could not be found locally")
-	ErrTreeNotFound = errors.New("go/build: no valid GOROOT or GOPATH could be found")
+	ErrNotFound     = errors.New("package could not be found locally")
+	ErrTreeNotFound = errors.New("no valid GOROOT or GOPATH could be found")
 )
 
 // FindTree takes an import or filesystem path and returns the
@@ -151,7 +151,7 @@ func init() {
 	root := runtime.GOROOT()
 	t, err := newTree(root)
 	if err != nil {
-		log.Printf("go/build: invalid GOROOT %q: %v", root, err)
+		log.Printf("invalid GOROOT %q: %v", root, err)
 	} else {
 		t.Goroot = true
 		Path = []*Tree{t}
@@ -163,7 +163,7 @@ func init() {
 		}
 		t, err := newTree(p)
 		if err != nil {
-			log.Printf("go/build: invalid GOPATH %q: %v", p, err)
+			log.Printf("invalid GOPATH %q: %v", p, err)
 			continue
 		}
 		Path = append(Path, t)
diff --git a/libgo/go/go/doc/doc.go b/libgo/go/go/doc/doc.go
index 91748643391..1bb22416c78 100644
--- a/libgo/go/go/doc/doc.go
+++ b/libgo/go/go/doc/doc.go
@@ -13,17 +13,32 @@ import (
 )
 
 // ----------------------------------------------------------------------------
+// Collection of documentation info
 
-type typeDoc struct {
+// embeddedType describes the type of an anonymous field.
+//
+type embeddedType struct {
+	typ *typeInfo // the corresponding base type
+	ptr bool      // if set, the anonymous field type is a pointer
+}
+
+type typeInfo struct {
 	// len(decl.Specs) == 1, and the element type is *ast.TypeSpec
 	// if the type declaration hasn't been seen yet, decl is nil
-	decl *ast.GenDecl
-	// values, factory functions, and methods associated with the type
+	decl     *ast.GenDecl
+	embedded []embeddedType
+	forward  *TypeDoc // forward link to processed type documentation
+
+	// declarations associated with the type
 	values    []*ast.GenDecl // consts and vars
 	factories map[string]*ast.FuncDecl
 	methods   map[string]*ast.FuncDecl
 }
 
+func (info *typeInfo) addEmbeddedType(embedded *typeInfo, isPtr bool) {
+	info.embedded = append(info.embedded, embeddedType{embedded, isPtr})
+}
+
 // docReader accumulates documentation for a single package.
 // It modifies the AST: Comments (declaration documentation)
 // that have been collected by the DocReader are set to nil
@@ -32,17 +47,19 @@ type typeDoc struct {
 // printing the corresponding AST node).
 //
 type docReader struct {
-	doc     *ast.CommentGroup // package documentation, if any
-	pkgName string
-	values  []*ast.GenDecl // consts and vars
-	types   map[string]*typeDoc
-	funcs   map[string]*ast.FuncDecl
-	bugs    []*ast.CommentGroup
+	doc      *ast.CommentGroup // package documentation, if any
+	pkgName  string
+	values   []*ast.GenDecl // consts and vars
+	types    map[string]*typeInfo
+	embedded map[string]*typeInfo // embedded types, possibly not exported
+	funcs    map[string]*ast.FuncDecl
+	bugs     []*ast.CommentGroup
 }
 
 func (doc *docReader) init(pkgName string) {
 	doc.pkgName = pkgName
-	doc.types = make(map[string]*typeDoc)
+	doc.types = make(map[string]*typeInfo)
+	doc.embedded = make(map[string]*typeInfo)
 	doc.funcs = make(map[string]*ast.FuncDecl)
 }
 
@@ -52,56 +69,40 @@ func (doc *docReader) addDoc(comments *ast.CommentGroup) {
 		doc.doc = comments
 		return
 	}
-
 	// More than one package comment: Usually there will be only
 	// one file with a package comment, but it's better to collect
 	// all comments than drop them on the floor.
-	// (This code isn't particularly clever - no amortized doubling is
-	// used - but this situation occurs rarely and is not time-critical.)
-	n1 := len(doc.doc.List)
-	n2 := len(comments.List)
-	list := make([]*ast.Comment, n1+1+n2) // + 1 for separator line
-	copy(list, doc.doc.List)
-	list[n1] = &ast.Comment{token.NoPos, "//"} // separator line
-	copy(list[n1+1:], comments.List)
-	doc.doc = &ast.CommentGroup{list}
+	blankComment := &ast.Comment{token.NoPos, "//"}
+	list := append(doc.doc.List, blankComment)
+	doc.doc.List = append(list, comments.List...)
 }
 
-func (doc *docReader) addType(decl *ast.GenDecl) {
-	spec := decl.Specs[0].(*ast.TypeSpec)
-	typ := doc.lookupTypeDoc(spec.Name.Name)
-	// typ should always be != nil since declared types
-	// are always named - be conservative and check
-	if typ != nil {
-		// a type should be added at most once, so typ.decl
-		// should be nil - if it isn't, simply overwrite it
-		typ.decl = decl
-	}
-}
-
-func (doc *docReader) lookupTypeDoc(name string) *typeDoc {
-	if name == "" {
+func (doc *docReader) lookupTypeInfo(name string) *typeInfo {
+	if name == "" || name == "_" {
 		return nil // no type docs for anonymous types
 	}
-	if tdoc, found := doc.types[name]; found {
-		return tdoc
+	if info, found := doc.types[name]; found {
+		return info
 	}
 	// type wasn't found - add one without declaration
-	tdoc := &typeDoc{nil, nil, make(map[string]*ast.FuncDecl), make(map[string]*ast.FuncDecl)}
-	doc.types[name] = tdoc
-	return tdoc
+	info := &typeInfo{
+		factories: make(map[string]*ast.FuncDecl),
+		methods:   make(map[string]*ast.FuncDecl),
+	}
+	doc.types[name] = info
+	return info
 }
 
-func baseTypeName(typ ast.Expr) string {
+func baseTypeName(typ ast.Expr, allTypes bool) string {
 	switch t := typ.(type) {
 	case *ast.Ident:
 		// if the type is not exported, the effect to
 		// a client is as if there were no type name
-		if t.IsExported() {
+		if t.IsExported() || allTypes {
 			return t.Name
 		}
 	case *ast.StarExpr:
-		return baseTypeName(t.X)
+		return baseTypeName(t.X, allTypes)
 	}
 	return ""
 }
@@ -120,7 +121,7 @@ func (doc *docReader) addValue(decl *ast.GenDecl) {
 			switch {
 			case v.Type != nil:
 				// a type is present; determine its name
-				name = baseTypeName(v.Type)
+				name = baseTypeName(v.Type, false)
 			case decl.Tok == token.CONST:
 				// no type is present but we have a constant declaration;
 				// use the previous type name (w/o more type information
@@ -148,7 +149,7 @@ func (doc *docReader) addValue(decl *ast.GenDecl) {
 	values := &doc.values
 	if domName != "" && domFreq >= int(float64(len(decl.Specs))*threshold) {
 		// typed entries are sufficiently frequent
-		typ := doc.lookupTypeDoc(domName)
+		typ := doc.lookupTypeInfo(domName)
 		if typ != nil {
 			values = &typ.values // associate with that type
 		}
@@ -175,10 +176,13 @@ func setFunc(table map[string]*ast.FuncDecl, f *ast.FuncDecl) {
 }
 
 func (doc *docReader) addFunc(fun *ast.FuncDecl) {
+	// strip function body
+	fun.Body = nil
+
 	// determine if it should be associated with a type
 	if fun.Recv != nil {
 		// method
-		typ := doc.lookupTypeDoc(baseTypeName(fun.Recv.List[0].Type))
+		typ := doc.lookupTypeInfo(baseTypeName(fun.Recv.List[0].Type, false))
 		if typ != nil {
 			// exported receiver type
 			setFunc(typ.methods, fun)
@@ -199,8 +203,8 @@ func (doc *docReader) addFunc(fun *ast.FuncDecl) {
 			// exactly one (named or anonymous) result associated
 			// with the first type in result signature (there may
 			// be more than one result)
-			tname := baseTypeName(res.Type)
-			typ := doc.lookupTypeDoc(tname)
+			tname := baseTypeName(res.Type, false)
+			typ := doc.lookupTypeInfo(tname)
 			if typ != nil {
 				// named and exported result type
 				setFunc(typ.factories, fun)
@@ -224,10 +228,17 @@ func (doc *docReader) addDecl(decl ast.Decl) {
 			case token.TYPE:
 				// types are handled individually
 				for _, spec := range d.Specs {
-					// make a (fake) GenDecl node for this TypeSpec
+					tspec := spec.(*ast.TypeSpec)
+					// add the type to the documentation
+					info := doc.lookupTypeInfo(tspec.Name.Name)
+					if info == nil {
+						continue // no name - ignore the type
+					}
+					// Make a (fake) GenDecl node for this TypeSpec
 					// (we need to do this here - as opposed to just
 					// for printing - so we don't lose the GenDecl
-					// documentation)
+					// documentation). Since a new GenDecl node is
+					// created, there's no need to nil out d.Doc.
 					//
 					// TODO(gri): Consider just collecting the TypeSpec
 					// node (and copy in the GenDecl.doc if there is no
@@ -235,8 +246,32 @@ func (doc *docReader) addDecl(decl ast.Decl) {
 					// makeTypeDocs below). Simpler data structures, but
 					// would lose GenDecl documentation if the TypeSpec
 					// has documentation as well.
-					doc.addType(&ast.GenDecl{d.Doc, d.Pos(), token.TYPE, token.NoPos, []ast.Spec{spec}, token.NoPos})
-					// A new GenDecl node is created, no need to nil out d.Doc.
+					fake := &ast.GenDecl{d.Doc, d.Pos(), token.TYPE, token.NoPos,
+						[]ast.Spec{tspec}, token.NoPos}
+					// A type should be added at most once, so info.decl
+					// should be nil - if it isn't, simply overwrite it.
+					info.decl = fake
+					// Look for anonymous fields that might contribute methods.
+					var fields *ast.FieldList
+					switch typ := spec.(*ast.TypeSpec).Type.(type) {
+					case *ast.StructType:
+						fields = typ.Fields
+					case *ast.InterfaceType:
+						fields = typ.Methods
+					}
+					if fields != nil {
+						for _, field := range fields.List {
+							if len(field.Names) == 0 {
+								// anonymous field - add corresponding type
+								// to the info and collect it in doc
+								name := baseTypeName(field.Type, true)
+								if embedded := doc.lookupTypeInfo(name); embedded != nil {
+									_, ptr := field.Type.(*ast.StarExpr)
+									info.addEmbeddedType(embedded, ptr)
+								}
+							}
+						}
+					}
 				}
 			}
 		}
@@ -285,19 +320,15 @@ func (doc *docReader) addFile(src *ast.File) {
 	src.Comments = nil // consumed unassociated comments - remove from ast.File node
 }
 
-func NewFileDoc(file *ast.File) *PackageDoc {
-	var r docReader
-	r.init(file.Name.Name)
-	r.addFile(file)
-	return r.newDoc("", nil)
-}
-
-func NewPackageDoc(pkg *ast.Package, importpath string) *PackageDoc {
+func NewPackageDoc(pkg *ast.Package, importpath string, exportsOnly bool) *PackageDoc {
 	var r docReader
 	r.init(pkg.Name)
 	filenames := make([]string, len(pkg.Files))
 	i := 0
 	for filename, f := range pkg.Files {
+		if exportsOnly {
+			r.fileExports(f)
+		}
 		r.addFile(f)
 		filenames[i] = filename
 		i++
@@ -397,6 +428,25 @@ func makeFuncDocs(m map[string]*ast.FuncDecl) []*FuncDoc {
 	return d
 }
 
+type methodSet map[string]*FuncDoc
+
+func (mset methodSet) add(m *FuncDoc) {
+	if mset[m.Name] == nil {
+		mset[m.Name] = m
+	}
+}
+
+func (mset methodSet) sortedList() []*FuncDoc {
+	list := make([]*FuncDoc, len(mset))
+	i := 0
+	for _, m := range mset {
+		list[i] = m
+		i++
+	}
+	sort.Sort(sortFuncDoc(list))
+	return list
+}
+
 // TypeDoc is the documentation for a declared type.
 // Consts and Vars are sorted lists of constants and variables of (mostly) that type.
 // Factories is a sorted list of factory functions that return that type.
@@ -407,7 +457,9 @@ type TypeDoc struct {
 	Consts    []*ValueDoc
 	Vars      []*ValueDoc
 	Factories []*FuncDoc
-	Methods   []*FuncDoc
+	methods   []*FuncDoc // top-level methods only
+	embedded  methodSet  // embedded methods only
+	Methods   []*FuncDoc // all methods including embedded ones
 	Decl      *ast.GenDecl
 	order     int
 }
@@ -429,11 +481,17 @@ func (p sortTypeDoc) Less(i, j int) bool {
 // NOTE(rsc): This would appear not to be correct for type ( )
 // blocks, but the doc extractor above has split them into
 // individual declarations.
-func (doc *docReader) makeTypeDocs(m map[string]*typeDoc) []*TypeDoc {
-	d := make([]*TypeDoc, len(m))
+func (doc *docReader) makeTypeDocs(m map[string]*typeInfo) []*TypeDoc {
+	// TODO(gri) Consider computing the embedded method information
+	//           before calling makeTypeDocs. Then this function can
+	//           be single-phased again. Also, it might simplify some
+	//           of the logic.
+	//
+	// phase 1: associate collected declarations with TypeDocs
+	list := make([]*TypeDoc, len(m))
 	i := 0
 	for _, old := range m {
-		// all typeDocs should have a declaration associated with
+		// all typeInfos should have a declaration associated with
 		// them after processing an entire package - be conservative
 		// and check
 		if decl := old.decl; decl != nil {
@@ -451,10 +509,16 @@ func (doc *docReader) makeTypeDocs(m map[string]*typeDoc) []*TypeDoc {
 			t.Consts = makeValueDocs(old.values, token.CONST)
 			t.Vars = makeValueDocs(old.values, token.VAR)
 			t.Factories = makeFuncDocs(old.factories)
-			t.Methods = makeFuncDocs(old.methods)
+			t.methods = makeFuncDocs(old.methods)
+			// The list of embedded types' methods is computed from the list
+			// of embedded types, some of which may not have been processed
+			// yet (i.e., their forward link is nil) - do this in a 2nd phase.
+			// The final list of methods can only be computed after that -
+			// do this in a 3rd phase.
 			t.Decl = old.decl
 			t.order = i
-			d[i] = t
+			old.forward = t // old has been processed
+			list[i] = t
 			i++
 		} else {
 			// no corresponding type declaration found - move any associated
@@ -477,9 +541,99 @@ func (doc *docReader) makeTypeDocs(m map[string]*typeDoc) []*TypeDoc {
 			}
 		}
 	}
-	d = d[0:i] // some types may have been ignored
-	sort.Sort(sortTypeDoc(d))
-	return d
+	list = list[0:i] // some types may have been ignored
+
+	// phase 2: collect embedded methods for each processed typeInfo
+	for _, old := range m {
+		if t := old.forward; t != nil {
+			// old has been processed into t; collect embedded
+			// methods for t from the list of processed embedded
+			// types in old (and thus for which the methods are known)
+			typ := t.Type
+			if _, ok := typ.Type.(*ast.StructType); ok {
+				// struct
+				t.embedded = make(methodSet)
+				collectEmbeddedMethods(t.embedded, old, typ.Name.Name)
+			} else {
+				// interface
+				// TODO(gri) fix this
+			}
+		}
+	}
+
+	// phase 3: compute final method set for each TypeDoc
+	for _, d := range list {
+		if len(d.embedded) > 0 {
+			// there are embedded methods - exclude
+			// the ones with names conflicting with
+			// non-embedded methods
+			mset := make(methodSet)
+			// top-level methods have priority
+			for _, m := range d.methods {
+				mset.add(m)
+			}
+			// add non-conflicting embedded methods
+			for _, m := range d.embedded {
+				mset.add(m)
+			}
+			d.Methods = mset.sortedList()
+		} else {
+			// no embedded methods
+			d.Methods = d.methods
+		}
+	}
+
+	sort.Sort(sortTypeDoc(list))
+	return list
+}
+
+// collectEmbeddedMethods collects the embedded methods from all
+// processed embedded types found in info in mset. It considers
+// embedded types at the most shallow level first so that more
+// deeply nested embedded methods with conflicting names are
+// excluded.
+//
+func collectEmbeddedMethods(mset methodSet, info *typeInfo, recvTypeName string) {
+	for _, e := range info.embedded {
+		if e.typ.forward != nil { // == e was processed
+			for _, m := range e.typ.forward.methods {
+				mset.add(customizeRecv(m, e.ptr, recvTypeName))
+			}
+			collectEmbeddedMethods(mset, e.typ, recvTypeName)
+		}
+	}
+}
+
+func customizeRecv(m *FuncDoc, embeddedIsPtr bool, recvTypeName string) *FuncDoc {
+	if m == nil || m.Decl == nil || m.Decl.Recv == nil || len(m.Decl.Recv.List) != 1 {
+		return m // shouldn't happen, but be safe
+	}
+
+	// copy existing receiver field and set new type
+	// TODO(gri) is receiver type computation correct?
+	//           what about deeply nested embeddings?
+	newField := *m.Decl.Recv.List[0]
+	_, origRecvIsPtr := newField.Type.(*ast.StarExpr)
+	var typ ast.Expr = ast.NewIdent(recvTypeName)
+	if embeddedIsPtr || origRecvIsPtr {
+		typ = &ast.StarExpr{token.NoPos, typ}
+	}
+	newField.Type = typ
+
+	// copy existing receiver field list and set new receiver field
+	newFieldList := *m.Decl.Recv
+	newFieldList.List = []*ast.Field{&newField}
+
+	// copy existing function declaration and set new receiver field list
+	newFuncDecl := *m.Decl
+	newFuncDecl.Recv = &newFieldList
+
+	// copy existing function documentation and set new declaration
+	newM := *m
+	newM.Decl = &newFuncDecl
+	newM.Recv = typ
+
+	return &newM
 }
 
 func makeBugDocs(list []*ast.CommentGroup) []string {
@@ -523,104 +677,3 @@ func (doc *docReader) newDoc(importpath string, filenames []string) *PackageDoc
 	p.Bugs = makeBugDocs(doc.bugs)
 	return p
 }
-
-// ----------------------------------------------------------------------------
-// Filtering by name
-
-type Filter func(string) bool
-
-func matchFields(fields *ast.FieldList, f Filter) bool {
-	if fields != nil {
-		for _, field := range fields.List {
-			for _, name := range field.Names {
-				if f(name.Name) {
-					return true
-				}
-			}
-		}
-	}
-	return false
-}
-
-func matchDecl(d *ast.GenDecl, f Filter) bool {
-	for _, d := range d.Specs {
-		switch v := d.(type) {
-		case *ast.ValueSpec:
-			for _, name := range v.Names {
-				if f(name.Name) {
-					return true
-				}
-			}
-		case *ast.TypeSpec:
-			if f(v.Name.Name) {
-				return true
-			}
-			switch t := v.Type.(type) {
-			case *ast.StructType:
-				if matchFields(t.Fields, f) {
-					return true
-				}
-			case *ast.InterfaceType:
-				if matchFields(t.Methods, f) {
-					return true
-				}
-			}
-		}
-	}
-	return false
-}
-
-func filterValueDocs(a []*ValueDoc, f Filter) []*ValueDoc {
-	w := 0
-	for _, vd := range a {
-		if matchDecl(vd.Decl, f) {
-			a[w] = vd
-			w++
-		}
-	}
-	return a[0:w]
-}
-
-func filterFuncDocs(a []*FuncDoc, f Filter) []*FuncDoc {
-	w := 0
-	for _, fd := range a {
-		if f(fd.Name) {
-			a[w] = fd
-			w++
-		}
-	}
-	return a[0:w]
-}
-
-func filterTypeDocs(a []*TypeDoc, f Filter) []*TypeDoc {
-	w := 0
-	for _, td := range a {
-		n := 0 // number of matches
-		if matchDecl(td.Decl, f) {
-			n = 1
-		} else {
-			// type name doesn't match, but we may have matching consts, vars, factories or methods
-			td.Consts = filterValueDocs(td.Consts, f)
-			td.Vars = filterValueDocs(td.Vars, f)
-			td.Factories = filterFuncDocs(td.Factories, f)
-			td.Methods = filterFuncDocs(td.Methods, f)
-			n += len(td.Consts) + len(td.Vars) + len(td.Factories) + len(td.Methods)
-		}
-		if n > 0 {
-			a[w] = td
-			w++
-		}
-	}
-	return a[0:w]
-}
-
-// Filter eliminates documentation for names that don't pass through the filter f.
-// TODO: Recognize "Type.Method" as a name.
-//
-func (p *PackageDoc) Filter(f Filter) {
-	p.Consts = filterValueDocs(p.Consts, f)
-	p.Vars = filterValueDocs(p.Vars, f)
-	p.Types = filterTypeDocs(p.Types, f)
-	p.Funcs = filterFuncDocs(p.Funcs, f)
-	p.Doc = "" // don't show top-level package doc
-}
diff --git a/libgo/go/go/doc/exports.go b/libgo/go/go/doc/exports.go
new file mode 100644
index 00000000000..9cd186a9c7a
--- /dev/null
+++ b/libgo/go/go/doc/exports.go
@@ -0,0 +1,167 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file implements export filtering of an AST.
+
+package doc
+
+import "go/ast"
+
+func filterIdentList(list []*ast.Ident) []*ast.Ident {
+	j := 0
+	for _, x := range list {
+		if ast.IsExported(x.Name) {
+			list[j] = x
+			j++
+		}
+	}
+	return list[0:j]
+}
+
+func baseName(x ast.Expr) *ast.Ident {
+	switch t := x.(type) {
+	case *ast.Ident:
+		return t
+	case *ast.SelectorExpr:
+		if _, ok := t.X.(*ast.Ident); ok {
+			return t.Sel
+		}
+	case *ast.StarExpr:
+		return baseName(t.X)
+	}
+	return nil
+}
+
+func (doc *docReader) filterFieldList(fields *ast.FieldList) (removedFields bool) {
+	if fields == nil {
+		return false
+	}
+	list := fields.List
+	j := 0
+	for _, f := range list {
+		keepField := false
+		if len(f.Names) == 0 {
+			// anonymous field
+			name := baseName(f.Type)
+			keepField = name != nil && name.IsExported()
+		} else {
+			n := len(f.Names)
+			f.Names = filterIdentList(f.Names)
+			if len(f.Names) < n {
+				removedFields = true
+			}
+			keepField = len(f.Names) > 0
+		}
+		if keepField {
+			doc.filterType(f.Type)
+			list[j] = f
+			j++
+		}
+	}
+	if j < len(list) {
+		removedFields = true
+	}
+	fields.List = list[0:j]
+	return
+}
+
+func (doc *docReader) filterParamList(fields *ast.FieldList) bool {
+	if fields == nil {
+		return false
+	}
+	var b bool
+	for _, f := range fields.List {
+		if doc.filterType(f.Type) {
+			b = true
+		}
+	}
+	return b
+}
+
+func (doc *docReader) filterType(typ ast.Expr) bool {
+	switch t := typ.(type) {
+	case *ast.Ident:
+		return ast.IsExported(t.Name)
+	case *ast.ParenExpr:
+		return doc.filterType(t.X)
+	case *ast.ArrayType:
+		return doc.filterType(t.Elt)
+	case *ast.StructType:
+		if doc.filterFieldList(t.Fields) {
+			t.Incomplete = true
+		}
+		return len(t.Fields.List) > 0
+	case *ast.FuncType:
+		b1 := doc.filterParamList(t.Params)
+		b2 := doc.filterParamList(t.Results)
+		return b1 || b2
+	case *ast.InterfaceType:
+		if doc.filterFieldList(t.Methods) {
+			t.Incomplete = true
+		}
+		return len(t.Methods.List) > 0
+	case *ast.MapType:
+		b1 := doc.filterType(t.Key)
+		b2 := doc.filterType(t.Value)
+		return b1 || b2
+	case *ast.ChanType:
+		return doc.filterType(t.Value)
+	}
+	return false
+}
+
+func (doc *docReader) filterSpec(spec ast.Spec) bool {
+	switch s := spec.(type) {
+	case *ast.ValueSpec:
+		s.Names = filterIdentList(s.Names)
+		if len(s.Names) > 0 {
+			doc.filterType(s.Type)
+			return true
+		}
+	case *ast.TypeSpec:
+		if ast.IsExported(s.Name.Name) {
+			doc.filterType(s.Type)
+			return true
+		}
+	}
+	return false
+}
+
+func (doc *docReader) filterSpecList(list []ast.Spec) []ast.Spec {
+	j := 0
+	for _, s := range list {
+		if doc.filterSpec(s) {
+			list[j] = s
+			j++
+		}
+	}
+	return list[0:j]
+}
+
+func (doc *docReader) filterDecl(decl ast.Decl) bool {
+	switch d := decl.(type) {
+	case *ast.GenDecl:
+		d.Specs = doc.filterSpecList(d.Specs)
+		return len(d.Specs) > 0
+	case *ast.FuncDecl:
+		return ast.IsExported(d.Name.Name)
+	}
+	return false
+}
+
+// fileExports trims the AST for a Go file in place such that
+// only exported nodes remain. fileExports returns true if
+// there are exported declarations; otherwise it returns false.
+//
+func (doc *docReader) fileExports(src *ast.File) bool {
+	j := 0
+	for _, d := range src.Decls {
+		if doc.filterDecl(d) {
+			src.Decls[j] = d
+			j++
+		}
+	}
+	src.Decls = src.Decls[0:j]
+	return j > 0
+}
diff --git a/libgo/go/go/doc/filter.go b/libgo/go/go/doc/filter.go
new file mode 100644
index 00000000000..71c2ebb68bd
--- /dev/null
+++ b/libgo/go/go/doc/filter.go
@@ -0,0 +1,105 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package doc
+
+import "go/ast"
+
+type Filter func(string) bool
+
+func matchFields(fields *ast.FieldList, f Filter) bool {
+	if fields != nil {
+		for _, field := range fields.List {
+			for _, name := range field.Names {
+				if f(name.Name) {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+func matchDecl(d *ast.GenDecl, f Filter) bool {
+	for _, d := range d.Specs {
+		switch v := d.(type) {
+		case *ast.ValueSpec:
+			for _, name := range v.Names {
+				if f(name.Name) {
+					return true
+				}
+			}
+		case *ast.TypeSpec:
+			if f(v.Name.Name) {
+				return true
+			}
+			switch t := v.Type.(type) {
+			case *ast.StructType:
+				if matchFields(t.Fields, f) {
+					return true
+				}
+			case *ast.InterfaceType:
+				if matchFields(t.Methods, f) {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+func filterValueDocs(a []*ValueDoc, f Filter) []*ValueDoc {
+	w := 0
+	for _, vd := range a {
+		if matchDecl(vd.Decl, f) {
+			a[w] = vd
+			w++
+		}
+	}
+	return a[0:w]
+}
+
+func filterFuncDocs(a []*FuncDoc, f Filter) []*FuncDoc {
+	w := 0
+	for _, fd := range a {
+		if f(fd.Name) {
+			a[w] = fd
+			w++
+		}
+	}
+	return a[0:w]
+}
+
+func filterTypeDocs(a []*TypeDoc, f Filter) []*TypeDoc {
+	w := 0
+	for _, td := range a {
+		n := 0 // number of matches
+		if matchDecl(td.Decl, f) {
+			n = 1
+		} else {
+			// type name doesn't match, but we may have matching consts, vars, factories or methods
+			td.Consts = filterValueDocs(td.Consts, f)
+			td.Vars = filterValueDocs(td.Vars, f)
+			td.Factories = filterFuncDocs(td.Factories, f)
+			td.Methods = filterFuncDocs(td.Methods, f)
+			n += len(td.Consts) + len(td.Vars) + len(td.Factories) + len(td.Methods)
+		}
+		if n > 0 {
+			a[w] = td
+			w++
+		}
+	}
+	return a[0:w]
+}
+
+// Filter eliminates documentation for names that don't pass through the filter f.
+// TODO: Recognize "Type.Method" as a name.
+//
+func (p *PackageDoc) Filter(f Filter) {
+	p.Consts = filterValueDocs(p.Consts, f)
+	p.Vars = filterValueDocs(p.Vars, f)
+	p.Types = filterTypeDocs(p.Types, f)
+	p.Funcs = filterFuncDocs(p.Funcs, f)
+	p.Doc = "" // don't show top-level package doc
+}
diff --git a/libgo/go/go/parser/parser.go b/libgo/go/go/parser/parser.go
index f0a8055f4c1..9fbed2d2ca3 100644
--- a/libgo/go/go/parser/parser.go
+++ b/libgo/go/go/parser/parser.go
@@ -144,28 +144,31 @@ func (p *parser) declare(decl, data interface{}, scope *ast.Scope, kind ast.ObjK
 	}
 }
 
-func (p *parser) shortVarDecl(idents []*ast.Ident) {
+func (p *parser) shortVarDecl(decl *ast.AssignStmt, list []ast.Expr) {
 	// Go spec: A short variable declaration may redeclare variables
 	// provided they were originally declared in the same block with
 	// the same type, and at least one of the non-blank variables is new.
 	n := 0 // number of new variables
-	for _, ident := range idents {
-		assert(ident.Obj == nil, "identifier already declared or resolved")
-		obj := ast.NewObj(ast.Var, ident.Name)
-		// short var declarations cannot have redeclaration errors
-		// and are not global => no need to remember the respective
-		// declaration
-		ident.Obj = obj
-		if ident.Name != "_" {
-			if alt := p.topScope.Insert(obj); alt != nil {
-				ident.Obj = alt // redeclaration
-			} else {
-				n++ // new declaration
+	for _, x := range list {
+		if ident, isIdent := x.(*ast.Ident); isIdent {
+			assert(ident.Obj == nil, "identifier already declared or resolved")
+			obj := ast.NewObj(ast.Var, ident.Name)
+			// remember corresponding assignment for other tools
+			obj.Decl = decl
+			ident.Obj = obj
+			if ident.Name != "_" {
+				if alt := p.topScope.Insert(obj); alt != nil {
+					ident.Obj = alt // redeclaration
+				} else {
+					n++ // new declaration
+				}
 			}
+		} else {
+			p.errorExpected(x.Pos(), "identifier")
 		}
 	}
 	if n == 0 && p.mode&DeclarationErrors != 0 {
-		p.error(idents[0].Pos(), "no new variables on left side of :=")
+		p.error(list[0].Pos(), "no new variables on left side of :=")
 	}
 }
 
@@ -522,7 +525,7 @@ func (p *parser) makeIdentList(list []ast.Expr) []*ast.Ident {
 	for i, x := range list {
 		ident, isIdent := x.(*ast.Ident)
 		if !isIdent {
-			pos := x.(ast.Expr).Pos()
+			pos := x.Pos()
 			p.errorExpected(pos, "identifier")
 			ident = &ast.Ident{pos, "_", nil}
 		}
@@ -1400,10 +1403,11 @@ func (p *parser) parseSimpleStmt(mode int) (ast.Stmt, bool) {
 		} else {
 			y = p.parseRhsList()
 		}
+		as := &ast.AssignStmt{x, pos, tok, y}
 		if tok == token.DEFINE {
-			p.shortVarDecl(p.makeIdentList(x))
+			p.shortVarDecl(as, x)
 		}
-		return &ast.AssignStmt{x, pos, tok, y}, isRange
+		return as, isRange
 	}
 
 	if len(x) > 1 {
@@ -1715,34 +1719,28 @@ func (p *parser) parseCommClause() *ast.CommClause {
 			comm = &ast.SendStmt{lhs[0], arrow, rhs}
 		} else {
 			// RecvStmt
-			pos := p.pos
-			tok := p.tok
-			var rhs ast.Expr
-			if tok == token.ASSIGN || tok == token.DEFINE {
+			if tok := p.tok; tok == token.ASSIGN || tok == token.DEFINE {
 				// RecvStmt with assignment
 				if len(lhs) > 2 {
 					p.errorExpected(lhs[0].Pos(), "1 or 2 expressions")
 					// continue with first two expressions
 					lhs = lhs[0:2]
 				}
+				pos := p.pos
 				p.next()
-				rhs = p.parseRhs()
-				if tok == token.DEFINE && lhs != nil {
-					p.shortVarDecl(p.makeIdentList(lhs))
+				rhs := p.parseRhs()
+				as := &ast.AssignStmt{lhs, pos, tok, []ast.Expr{rhs}}
+				if tok == token.DEFINE {
+					p.shortVarDecl(as, lhs)
 				}
+				comm = as
 			} else {
-				// rhs must be single receive operation
+				// lhs must be single receive operation
 				if len(lhs) > 1 {
 					p.errorExpected(lhs[0].Pos(), "1 expression")
 					// continue with first expression
 				}
-				rhs = lhs[0]
-				lhs = nil // there is no lhs
-			}
-			if lhs != nil {
-				comm = &ast.AssignStmt{lhs, pos, tok, []ast.Expr{rhs}}
-			} else {
-				comm = &ast.ExprStmt{rhs}
+				comm = &ast.ExprStmt{lhs[0]}
 			}
 		}
 	} else {
diff --git a/libgo/go/go/printer/nodes.go b/libgo/go/go/printer/nodes.go
index b2a48c28a73..6817cc42add 100644
--- a/libgo/go/go/printer/nodes.go
+++ b/libgo/go/go/printer/nodes.go
@@ -39,7 +39,10 @@ import (
 //            future (not yet interspersed) comments in this function.
 //
 func (p *printer) linebreak(line, min int, ws whiteSpace, newSection bool) (printedBreak bool) {
-	n := p.nlines(line-p.pos.Line, min)
+	n := nlimit(line - p.pos.Line)
+	if n < min {
+		n = min
+	}
 	if n > 0 {
 		p.print(ws)
 		if newSection {
@@ -361,9 +364,10 @@ func (p *printer) fieldList(fields *ast.FieldList, isStruct, isIncomplete bool)
 	lbrace := fields.Opening
 	list := fields.List
 	rbrace := fields.Closing
+	hasComments := isIncomplete || p.commentBefore(p.fset.Position(rbrace))
 	srcIsOneLine := lbrace.IsValid() && rbrace.IsValid() && p.fset.Position(lbrace).Line == p.fset.Position(rbrace).Line
 
-	if !isIncomplete && !p.commentBefore(p.fset.Position(rbrace)) && srcIsOneLine {
+	if !hasComments && srcIsOneLine {
 		// possibly a one-line struct/interface
 		if len(list) == 0 {
 			// no blank between keyword and {} in this case
@@ -388,9 +392,13 @@ func (p *printer) fieldList(fields *ast.FieldList, isStruct, isIncomplete bool)
 			return
 		}
 	}
+	// hasComments || !srcIsOneLine
+
+	p.print(blank, lbrace, token.LBRACE, indent)
+	if hasComments || len(list) > 0 {
+		p.print(formfeed)
+	}
 
-	// at least one entry or incomplete
-	p.print(blank, lbrace, token.LBRACE, indent, formfeed)
 	if isStruct {
 
 		sep := vtab
@@ -1509,9 +1517,14 @@ func (p *printer) file(src *ast.File) {
 			prev := tok
 			tok = declToken(d)
 			// if the declaration token changed (e.g., from CONST to TYPE)
+			// or the next declaration has documentation associated with it,
 			// print an empty line between top-level declarations
+			// (because p.linebreak is called with the position of d, which
+			// is past any documentation, the minimum requirement is satisfied
+			// even w/o the extra getDoc(d) nil-check - leave it in case the
+			// linebreak logic improves - there's already a TODO).
 			min := 1
-			if prev != tok {
+			if prev != tok || getDoc(d) != nil {
 				min = 2
 			}
 			p.linebreak(p.fset.Position(d.Pos()).Line, min, ignore, false)
diff --git a/libgo/go/go/printer/printer.go b/libgo/go/go/printer/printer.go
index 8538236c2c9..a78cfc65fcc 100644
--- a/libgo/go/go/printer/printer.go
+++ b/libgo/go/go/printer/printer.go
@@ -18,8 +18,11 @@ import (
 	"text/tabwriter"
 )
 
-const debug = false // enable for debugging
-const infinity = 1 << 30
+const (
+	maxNewlines = 2     // max. number of newlines between source text
+	debug       = false // enable for debugging
+	infinity    = 1 << 30
+)
 
 type whiteSpace byte
 
@@ -89,21 +92,7 @@ func (p *printer) internalError(msg ...interface{}) {
 	}
 }
 
-// nlines returns the adjusted number of linebreaks given the desired number
-// of breaks n such that min <= result <= max.
-//
-func (p *printer) nlines(n, min int) int {
-	const max = 2 // max. number of newlines
-	switch {
-	case n < min:
-		return min
-	case n > max:
-		return max
-	}
-	return n
-}
-
-// writeByte writes a single byte to p.output and updates p.pos.
+// writeByte writes ch to p.output and updates p.pos.
 func (p *printer) writeByte(ch byte) {
 	p.output.WriteByte(ch)
 	p.pos.Offset++
@@ -128,13 +117,11 @@ func (p *printer) writeByte(ch byte) {
 	}
 }
 
-// writeNewlines writes up to n newlines to p.output and updates p.pos.
-// The actual number of newlines written is limited by nlines.
-// nl must be one of '\n' or '\f'.
-//
-func (p *printer) writeNewlines(n int, nl byte) {
-	for n = p.nlines(n, 0); n > 0; n-- {
-		p.writeByte(nl)
+// writeByteN writes ch n times to p.output and updates p.pos.
+func (p *printer) writeByteN(ch byte, n int) {
+	for n > 0 {
+		p.writeByte(ch)
+		n--
 	}
 }
 
@@ -223,8 +210,8 @@ func (p *printer) writeCommentPrefix(pos, next token.Position, prev, comment *as
 	}
 
 	if pos.IsValid() && pos.Filename != p.last.Filename {
-		// comment in a different file - separate with newlines (writeNewlines will limit the number)
-		p.writeNewlines(10, '\f')
+		// comment in a different file - separate with newlines
+		p.writeByteN('\f', maxNewlines)
 		return
 	}
 
@@ -270,6 +257,7 @@ func (p *printer) writeCommentPrefix(pos, next token.Position, prev, comment *as
 	} else {
 		// comment on a different line:
 		// separate with at least one line break
+		droppedLinebreak := false
 		if prev == nil {
 			// first comment of a comment group
 			j := 0
@@ -295,6 +283,7 @@ func (p *printer) writeCommentPrefix(pos, next token.Position, prev, comment *as
 				case newline, formfeed:
 					// TODO(gri): may want to keep formfeed info in some cases
 					p.wsbuf[i] = ignore
+					droppedLinebreak = true
 				}
 				j = i
 				break
@@ -302,25 +291,41 @@ func (p *printer) writeCommentPrefix(pos, next token.Position, prev, comment *as
 			p.writeWhitespace(j)
 		}
 
-		// turn off indent if we're about to print a line directive.
-		indent := p.indent
-		if strings.HasPrefix(comment.Text, linePrefix) {
-			p.indent = 0
+		// determine number of linebreaks before the comment
+		n := 0
+		if pos.IsValid() && p.last.IsValid() {
+			n = pos.Line - p.last.Line
+			if n < 0 { // should never happen
+				n = 0
+			}
 		}
 
-		// use formfeeds to break columns before a comment;
-		// this is analogous to using formfeeds to separate
-		// individual lines of /*-style comments - but make
-		// sure there is at least one line break if the previous
-		// comment was a line comment
-		n := pos.Line - p.last.Line // if !pos.IsValid(), pos.Line == 0, and n will be 0
-		if n <= 0 && prev != nil && prev.Text[1] == '/' {
+		// at the package scope level only (p.indent == 0),
+		// add an extra newline if we dropped one before:
+		// this preserves a blank line before documentation
+		// comments at the package scope level (issue 2570)
+		if p.indent == 0 && droppedLinebreak {
+			n++
+		}
+
+		// make sure there is at least one line break
+		// if the previous comment was a line comment
+		if n == 0 && prev != nil && prev.Text[1] == '/' {
 			n = 1
 		}
+
 		if n > 0 {
-			p.writeNewlines(n, '\f')
+			// turn off indent if we're about to print a line directive
+			indent := p.indent
+			if strings.HasPrefix(comment.Text, linePrefix) {
+				p.indent = 0
+			}
+			// use formfeeds to break columns before a comment;
+			// this is analogous to using formfeeds to separate
+			// individual lines of /*-style comments
+			p.writeByteN('\f', nlimit(n))
+			p.indent = indent // restore indent
 		}
-		p.indent = indent
 	}
 }
 
@@ -550,10 +555,11 @@ func (p *printer) writeComment(comment *ast.Comment) {
 // writeCommentSuffix writes a line break after a comment if indicated
 // and processes any leftover indentation information. If a line break
 // is needed, the kind of break (newline vs formfeed) depends on the
-// pending whitespace. writeCommentSuffix returns true if a pending
-// formfeed was dropped from the whitespace buffer.
+// pending whitespace. The writeCommentSuffix result indicates if a
+// newline was written or if a formfeed was dropped from the whitespace
+// buffer.
 //
-func (p *printer) writeCommentSuffix(needsLinebreak bool) (droppedFF bool) {
+func (p *printer) writeCommentSuffix(needsLinebreak bool) (wroteNewline, droppedFF bool) {
 	for i, ch := range p.wsbuf {
 		switch ch {
 		case blank, vtab:
@@ -566,6 +572,7 @@ func (p *printer) writeCommentSuffix(needsLinebreak bool) (droppedFF bool) {
 			// but remember if we dropped any formfeeds
 			if needsLinebreak {
 				needsLinebreak = false
+				wroteNewline = true
 			} else {
 				if ch == formfeed {
 					droppedFF = true
@@ -579,6 +586,7 @@ func (p *printer) writeCommentSuffix(needsLinebreak bool) (droppedFF bool) {
 	// make sure we have a line break
 	if needsLinebreak {
 		p.writeByte('\n')
+		wroteNewline = true
 	}
 
 	return
@@ -587,10 +595,10 @@ func (p *printer) writeCommentSuffix(needsLinebreak bool) (droppedFF bool) {
 // intersperseComments consumes all comments that appear before the next token
 // tok and prints it together with the buffered whitespace (i.e., the whitespace
 // that needs to be written before the next token). A heuristic is used to mix
-// the comments and whitespace. intersperseComments returns true if a pending
-// formfeed was dropped from the whitespace buffer.
+// the comments and whitespace. The intersperseComments result indicates if a
+// newline was written or if a formfeed was dropped from the whitespace buffer.
 //
-func (p *printer) intersperseComments(next token.Position, tok token.Token) (droppedFF bool) {
+func (p *printer) intersperseComments(next token.Position, tok token.Token) (wroteNewline, droppedFF bool) {
 	var last *ast.Comment
 	for ; p.commentBefore(next); p.cindex++ {
 		for _, c := range p.comments[p.cindex].List {
@@ -618,7 +626,7 @@ func (p *printer) intersperseComments(next token.Position, tok token.Token) (dro
 	// no comment was written - we should never reach here since
 	// intersperseComments should not be called in that case
 	p.internalError("intersperseComments called without pending comments")
-	return false
+	return
 }
 
 // whiteWhitespace writes the first n whitespace entries.
@@ -671,6 +679,14 @@ func (p *printer) writeWhitespace(n int) {
 // ----------------------------------------------------------------------------
 // Printing interface
 
+// nlines limits n to maxNewlines.
+func nlimit(n int) int {
+	if n > maxNewlines {
+		n = maxNewlines
+	}
+	return n
+}
+
 func mayCombine(prev token.Token, next byte) (b bool) {
 	switch prev {
 	case token.INT:
@@ -765,17 +781,22 @@ func (p *printer) print(args ...interface{}) {
 		p.pos = next
 
 		if data != "" {
-			nl := byte('\n')
-			if p.flush(next, tok) {
-				nl = '\f' // dropped formfeed before
-			}
+			wroteNewline, droppedFF := p.flush(next, tok)
 
 			// intersperse extra newlines if present in the source
 			// (don't do this in flush as it will cause extra newlines
-			// at the end of a file) - use formfeeds if we dropped one
-			// before
-			if n := next.Line - p.pos.Line; n > 0 {
-				p.writeNewlines(n, nl)
+			// at the end of a file)
+			n := nlimit(next.Line - p.pos.Line)
+			// don't exceed maxNewlines if we already wrote one
+			if wroteNewline && n == maxNewlines {
+				n = maxNewlines - 1
+			}
+			if n > 0 {
+				ch := byte('\n')
+				if droppedFF {
+					ch = '\f' // use formfeed since we dropped one before
+				}
+				p.writeByteN(ch, n)
 			}
 
 			p.writeItem(next, data, isLit)
@@ -790,16 +811,15 @@ func (p *printer) commentBefore(next token.Position) bool {
 	return p.cindex < len(p.comments) && p.fset.Position(p.comments[p.cindex].List[0].Pos()).Offset < next.Offset
 }
 
-// Flush prints any pending comments and whitespace occurring
-// textually before the position of the next token tok. Flush
-// returns true if a pending formfeed character was dropped
-// from the whitespace buffer as a result of interspersing
-// comments.
+// Flush prints any pending comments and whitespace occurring textually
+// before the position of the next token tok. The Flush result indicates
+// if a newline was written or if a formfeed was dropped from the whitespace
+// buffer.
 //
-func (p *printer) flush(next token.Position, tok token.Token) (droppedFF bool) {
+func (p *printer) flush(next token.Position, tok token.Token) (wroteNewline, droppedFF bool) {
 	if p.commentBefore(next) {
 		// if there are comments before the next item, intersperse them
-		droppedFF = p.intersperseComments(next, tok)
+		wroteNewline, droppedFF = p.intersperseComments(next, tok)
 	} else {
 		// otherwise, write any leftover whitespace
 		p.writeWhitespace(len(p.wsbuf))
@@ -810,7 +830,8 @@ func (p *printer) flush(next token.Position, tok token.Token) (droppedFF bool) {
 // getNode returns the ast.CommentGroup associated with n, if any.
 func getDoc(n ast.Node) *ast.CommentGroup {
 	switch n := n.(type) {
-	// *ast.Fields cannot be printed separately - ignore for now
+	case *ast.Field:
+		return n.Doc
 	case *ast.ImportSpec:
 		return n.Doc
 	case *ast.ValueSpec:
diff --git a/libgo/go/go/printer/testdata/comments.golden b/libgo/go/go/printer/testdata/comments.golden
index 7b332252c4e..d2ad9e3a2ff 100644
--- a/libgo/go/go/printer/testdata/comments.golden
+++ b/libgo/go/go/printer/testdata/comments.golden
@@ -106,7 +106,7 @@ type S3 struct {
 var x int	// x
 var ()
 
-// This comment SHOULD be associated with the next declaration.
+// This comment SHOULD be associated with f0.
 func f0() {
 	const pi = 3.14	// pi
 	var s1 struct{}	/* an empty struct */	/* foo */
@@ -115,8 +115,9 @@ func f0() {
 	var s2 struct{} = struct{}{}
 	x := pi
 }
+
 //
-// NO SPACE HERE
+// This comment should be associated with f1, with one blank line before the comment.
 //
 func f1() {
 	f0()
diff --git a/libgo/go/go/printer/testdata/comments.input b/libgo/go/go/printer/testdata/comments.input
index 2a9a86b6815..222e0a713d4 100644
--- a/libgo/go/go/printer/testdata/comments.input
+++ b/libgo/go/go/printer/testdata/comments.input
@@ -107,7 +107,7 @@ var x int  // x
 var ()
 
 
-// This comment SHOULD be associated with the next declaration.
+// This comment SHOULD be associated with f0.
 func f0() {
 	const pi = 3.14  // pi
 	var s1 struct {}  /* an empty struct */ /* foo */
@@ -117,7 +117,7 @@ func f0() {
 	x := pi
 }
 //
-// NO SPACE HERE
+// This comment should be associated with f1, with one blank line before the comment.
 //
 func f1() {
 	f0()
@@ -130,7 +130,7 @@ func f1() {
 
 
 func _() {
-	// this comment should be properly indented
+// this comment should be properly indented
 }
 
 
diff --git a/libgo/go/go/printer/testdata/declarations.golden b/libgo/go/go/printer/testdata/declarations.golden
index bfa2568c21f..239ba890304 100644
--- a/libgo/go/go/printer/testdata/declarations.golden
+++ b/libgo/go/go/printer/testdata/declarations.golden
@@ -115,6 +115,18 @@ import _ "io"
 
 var _ int
 
+// at least one empty line between declarations of the same kind
+// if there is associated documentation (was issue 2570)
+type T1 struct{}
+
+// T2 comment
+type T2 struct {
+}	// should be a two-line struct
+
+// T3 comment
+type T2 struct {
+}	// should be a two-line struct
+
 // printing of constant literals
 const (
 	_	= "foobar"
@@ -286,6 +298,15 @@ type _ struct {
 	}
 }
 
+// no blank lines in empty structs and interfaces, but leave 1- or 2-line layout alone
+type _ struct{}
+type _ struct {
+}
+
+type _ interface{}
+type _ interface {
+}
+
 // no tabs for single or ungrouped decls
 func _() {
 	const xxxxxx = 0
diff --git a/libgo/go/go/printer/testdata/declarations.input b/libgo/go/go/printer/testdata/declarations.input
index 1d69c57b517..68f90308a36 100644
--- a/libgo/go/go/printer/testdata/declarations.input
+++ b/libgo/go/go/printer/testdata/declarations.input
@@ -115,6 +115,20 @@ import (
 import _ "io"
 var _ int
 
+// at least one empty line between declarations of the same kind
+// if there is associated documentation (was issue 2570)
+type T1 struct{}
+// T2 comment
+type T2 struct {
+} // should be a two-line struct
+
+
+// T3 comment
+type T2 struct {
+
+
+} // should be a two-line struct
+
 
 // printing of constant literals
 const (
@@ -293,6 +307,18 @@ type _ struct {
 }
 
 
+// no blank lines in empty structs and interfaces, but leave 1- or 2-line layout alone
+type _ struct{            }
+type _ struct {
+
+}
+
+type _ interface{            }
+type _ interface {
+
+}
+
+
 // no tabs for single or ungrouped decls
 func _() {
 	const xxxxxx = 0
diff --git a/libgo/go/go/printer/testdata/statements.golden b/libgo/go/go/printer/testdata/statements.golden
index a6d85107f0b..90e1743557d 100644
--- a/libgo/go/go/printer/testdata/statements.golden
+++ b/libgo/go/go/printer/testdata/statements.golden
@@ -271,7 +271,6 @@ func _() {
 	// Known bug: The first use call may have more than one empty line before
 	//            (see go/printer/nodes.go, func linebreak).
 
-
 	use(x)
 
 	if x < x {
@@ -386,7 +385,6 @@ L:	// A comment on the same line as the label, followed by a single empty line.
 	// Known bug: There may be more than one empty line before MoreCode()
 	//            (see go/printer/nodes.go, func linebreak).
 
-
 	MoreCode()
 }
 
diff --git a/libgo/go/go/scanner/scanner.go b/libgo/go/go/scanner/scanner.go
index cef9c486508..7fb0104e450 100644
--- a/libgo/go/go/scanner/scanner.go
+++ b/libgo/go/go/scanner/scanner.go
@@ -426,13 +426,16 @@ func (S *Scanner) scanString() {
 	S.next()
 }
 
-func (S *Scanner) scanRawString() {
+func (S *Scanner) scanRawString() (hasCR bool) {
 	// '`' opening already consumed
 	offs := S.offset - 1
 
 	for S.ch != '`' {
 		ch := S.ch
 		S.next()
+		if ch == '\r' {
+			hasCR = true
+		}
 		if ch < 0 {
 			S.error(offs, "string not terminated")
 			break
@@ -440,6 +443,7 @@ func (S *Scanner) scanRawString() {
 	}
 
 	S.next()
+	return
 }
 
 func (S *Scanner) skipWhitespace() {
@@ -490,6 +494,18 @@ func (S *Scanner) switch4(tok0, tok1 token.Token, ch2 rune, tok2, tok3 token.Tok
 	return tok0
 }
 
+func stripCR(b []byte) []byte {
+	c := make([]byte, len(b))
+	i := 0
+	for _, ch := range b {
+		if ch != '\r' {
+			c[i] = ch
+			i++
+		}
+	}
+	return c[:i]
+}
+
 // Scan scans the next token and returns the token position,
 // the token, and the literal string corresponding to the
 // token. The source end is indicated by token.EOF.
@@ -518,6 +534,7 @@ scanAgain:
 	insertSemi := false
 	offs := S.offset
 	tok := token.ILLEGAL
+	hasCR := false
 
 	// determine token value
 	switch ch := S.ch; {
@@ -556,7 +573,7 @@ scanAgain:
 		case '`':
 			insertSemi = true
 			tok = token.STRING
-			S.scanRawString()
+			hasCR = S.scanRawString()
 		case ':':
 			tok = S.switch2(token.COLON, token.DEFINE)
 		case '.':
@@ -663,5 +680,9 @@ scanAgain:
 	// TODO(gri): The scanner API should change such that the literal string
 	//            is only valid if an actual literal was scanned. This will
 	//            permit a more efficient implementation.
-	return S.file.Pos(offs), tok, string(S.src[offs:S.offset])
+	lit := S.src[offs:S.offset]
+	if hasCR {
+		lit = stripCR(lit)
+	}
+	return S.file.Pos(offs), tok, string(lit)
 }
diff --git a/libgo/go/go/scanner/scanner_test.go b/libgo/go/go/scanner/scanner_test.go
index 7ed927a49fa..dc8ab2a748a 100644
--- a/libgo/go/go/scanner/scanner_test.go
+++ b/libgo/go/go/scanner/scanner_test.go
@@ -83,6 +83,8 @@ var tokens = [...]elt{
 		"`",
 		literal,
 	},
+	{token.STRING, "`\r`", literal},
+	{token.STRING, "`foo\r\nbar`", literal},
 
 	// Operators and delimiters
 	{token.ADD, "+", operator},
@@ -239,8 +241,16 @@ func TestScan(t *testing.T) {
 		if tok != e.tok {
 			t.Errorf("bad token for %q: got %s, expected %s", lit, tok, e.tok)
 		}
-		if e.tok.IsLiteral() && lit != e.lit {
-			t.Errorf("bad literal for %q: got %q, expected %q", lit, lit, e.lit)
+		if e.tok.IsLiteral() {
+			// no CRs in raw string literals
+			elit := e.lit
+			if elit[0] == '`' {
+				elit = string(stripCR([]byte(elit)))
+				epos.Offset += len(e.lit) - len(lit) // correct position
+			}
+			if lit != elit {
+				t.Errorf("bad literal for %q: got %q, expected %q", lit, lit, elit)
+			}
 		}
 		if tokenclass(tok) != e.class {
 			t.Errorf("bad class for %q: got %d, expected %d", lit, tokenclass(tok), e.class)
diff --git a/libgo/go/html/const.go b/libgo/go/html/const.go
index 832e9dbc096..d7cc8bb9a99 100644
--- a/libgo/go/html/const.go
+++ b/libgo/go/html/const.go
@@ -7,7 +7,7 @@ package html
 // Section 12.2.3.2 of the HTML5 specification says "The following elements
 // have varying levels of special parsing rules".
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html#the-stack-of-open-elements
-var isSpecialElement = map[string]bool{
+var isSpecialElementMap = map[string]bool{
 	"address":    true,
 	"applet":     true,
 	"area":       true,
@@ -88,3 +88,13 @@ var isSpecialElement = map[string]bool{
 	"wbr":        true,
 	"xmp":        true,
 }
+
+func isSpecialElement(element *Node) bool {
+	switch element.Namespace {
+	case "", "html":
+		return isSpecialElementMap[element.Data]
+	case "svg":
+		return element.Data == "foreignObject"
+	}
+	return false
+}
diff --git a/libgo/go/html/parse.go b/libgo/go/html/parse.go
index 4cb246969e5..6962e643932 100644
--- a/libgo/go/html/parse.go
+++ b/libgo/go/html/parse.go
@@ -319,10 +319,7 @@ func (p *parser) resetInsertionMode() {
 		case "html":
 			p.im = beforeHeadIM
 		default:
-			if p.top().Namespace == "" {
-				continue
-			}
-			p.im = inForeignContentIM
+			continue
 		}
 		return
 	}
@@ -705,7 +702,7 @@ func inBodyIM(p *parser) bool {
 				case "address", "div", "p":
 					continue
 				default:
-					if !isSpecialElement[node.Data] {
+					if !isSpecialElement(node) {
 						continue
 					}
 				}
@@ -723,7 +720,7 @@ func inBodyIM(p *parser) bool {
 				case "address", "div", "p":
 					continue
 				default:
-					if !isSpecialElement[node.Data] {
+					if !isSpecialElement(node) {
 						continue
 					}
 				}
@@ -814,7 +811,6 @@ func inBodyIM(p *parser) bool {
 			// TODO: adjust foreign attributes.
 			p.addElement(p.tok.Data, p.tok.Attr)
 			p.top().Namespace = namespace
-			p.im = inForeignContentIM
 			return true
 		case "caption", "col", "colgroup", "frame", "head", "tbody", "td", "tfoot", "th", "thead", "tr":
 			// Ignore the token.
@@ -895,7 +891,7 @@ func (p *parser) inBodyEndTagFormatting(tag string) {
 		// Steps 5-6. Find the furthest block.
 		var furthestBlock *Node
 		for _, e := range p.oe[feIndex:] {
-			if isSpecialElement[e.Data] {
+			if isSpecialElement(e) {
 				furthestBlock = e
 				break
 			}
@@ -988,7 +984,7 @@ func (p *parser) inBodyEndTagOther(tag string) {
 			p.oe = p.oe[:i]
 			break
 		}
-		if isSpecialElement[p.oe[i].Data] {
+		if isSpecialElement(p.oe[i]) {
 			break
 		}
 	}
@@ -1206,6 +1202,13 @@ func inTableBodyIM(p *parser) bool {
 			add = true
 			data = "tr"
 			consumed = false
+		case "caption", "col", "colgroup", "tbody", "tfoot", "thead":
+			if !p.popUntil(tableScopeStopTags, "tbody", "thead", "tfoot") {
+				// Ignore the token.
+				return true
+			}
+			p.im = inTableIM
+			return false
 		default:
 			// TODO.
 		}
@@ -1569,6 +1572,19 @@ func afterAfterFramesetIM(p *parser) bool {
 			Type: CommentNode,
 			Data: p.tok.Data,
 		})
+	case TextToken:
+		// Ignore all text but whitespace.
+		s := strings.Map(func(c rune) rune {
+			switch c {
+			case ' ', '\t', '\n', '\f', '\r':
+				return c
+			}
+			return -1
+		}, p.tok.Data)
+		if s != "" {
+			p.reconstructActiveFormattingElements()
+			p.addText(s)
+		}
 	case StartTagToken:
 		switch p.tok.Data {
 		case "html":
@@ -1583,8 +1599,19 @@ func afterAfterFramesetIM(p *parser) bool {
 }
 
 // Section 12.2.5.5.
-func inForeignContentIM(p *parser) bool {
+func parseForeignContent(p *parser) bool {
 	switch p.tok.Type {
+	case TextToken:
+		// TODO: HTML integration points.
+		if p.top().Namespace == "" {
+			inBodyIM(p)
+			p.resetInsertionMode()
+			return true
+		}
+		if p.framesetOK {
+			p.framesetOK = strings.TrimLeft(p.tok.Data, whitespace) == ""
+		}
+		p.addText(p.tok.Data)
 	case CommentToken:
 		p.addChild(&Node{
 			Type: CommentNode,
@@ -1592,7 +1619,14 @@ func inForeignContentIM(p *parser) bool {
 		})
 	case StartTagToken:
 		if breakout[p.tok.Data] {
-			// TODO.
+			for i := len(p.oe) - 1; i >= 0; i-- {
+				// TODO: HTML, MathML integration points.
+				if p.oe[i].Namespace == "" {
+					p.oe = p.oe[:i+1]
+					break
+				}
+			}
+			return false
 		}
 		switch p.top().Namespace {
 		case "mathml":
@@ -1606,13 +1640,36 @@ func inForeignContentIM(p *parser) bool {
 		// TODO: adjust foreign attributes.
 		p.addElement(p.tok.Data, p.tok.Attr)
 	case EndTagToken:
-		// TODO.
+		for i := len(p.oe) - 1; i >= 0; i-- {
+			if p.oe[i].Namespace == "" {
+				return p.im(p)
+			}
+			if strings.EqualFold(p.oe[i].Data, p.tok.Data) {
+				p.oe = p.oe[:i]
+				break
+			}
+		}
+		return true
 	default:
 		// Ignore the token.
 	}
 	return true
 }
 
+// Section 12.2.5.
+func (p *parser) inForeignContent() bool {
+	if len(p.oe) == 0 {
+		return false
+	}
+	n := p.oe[len(p.oe)-1]
+	if n.Namespace == "" {
+		return false
+	}
+	// TODO: MathML, HTML integration points.
+	// TODO: MathML's annotation-xml combining with SVG's svg.
+	return true
+}
+
 func (p *parser) parse() error {
 	// Iterate until EOF. Any other error will cause an early return.
 	consumed := true
@@ -1625,7 +1682,11 @@ func (p *parser) parse() error {
 				return err
 			}
 		}
-		consumed = p.im(p)
+		if p.inForeignContent() {
+			consumed = parseForeignContent(p)
+		} else {
+			consumed = p.im(p)
+		}
 	}
 	// Loop until the final token (the ErrorToken signifying EOF) is consumed.
 	for {
diff --git a/libgo/go/html/parse_test.go b/libgo/go/html/parse_test.go
index e887631c63d..015b5838f0b 100644
--- a/libgo/go/html/parse_test.go
+++ b/libgo/go/html/parse_test.go
@@ -172,7 +172,8 @@ func TestParser(t *testing.T) {
 		{"tests3.dat", -1},
 		{"tests4.dat", -1},
 		{"tests5.dat", -1},
-		{"tests6.dat", 36},
+		{"tests6.dat", 47},
+		{"tests10.dat", 16},
 	}
 	for _, tf := range testFiles {
 		f, err := os.Open("testdata/webkit/" + tf.filename)
diff --git a/libgo/go/html/template/error.go b/libgo/go/html/template/error.go
index 9622d7e48ee..dcac7489676 100644
--- a/libgo/go/html/template/error.go
+++ b/libgo/go/html/template/error.go
@@ -183,11 +183,11 @@ const (
 
 func (e *Error) Error() string {
 	if e.Line != 0 {
-		return fmt.Sprintf("exp/template/html:%s:%d: %s", e.Name, e.Line, e.Description)
+		return fmt.Sprintf("html/template:%s:%d: %s", e.Name, e.Line, e.Description)
 	} else if e.Name != "" {
-		return fmt.Sprintf("exp/template/html:%s: %s", e.Name, e.Description)
+		return fmt.Sprintf("html/template:%s: %s", e.Name, e.Description)
 	}
-	return "exp/template/html: " + e.Description
+	return "html/template: " + e.Description
 }
 
 // errorf creates an error given a format string f and args.
diff --git a/libgo/go/html/template/escape.go b/libgo/go/html/template/escape.go
index 2f6be3b6c21..c6f723ae4a4 100644
--- a/libgo/go/html/template/escape.go
+++ b/libgo/go/html/template/escape.go
@@ -486,9 +486,17 @@ func (e *escaper) escapeTree(c context, name string, line int) (context, string)
 	}
 	t := e.template(name)
 	if t == nil {
+		// Two cases: The template exists but is empty, or has never been mentioned at
+		// all. Distinguish the cases in the error messages.
+		if e.tmpl.set[name] != nil {
+			return context{
+				state: stateError,
+				err:   errorf(ErrNoSuchTemplate, line, "%q is an incomplete or empty template", name),
+			}, dname
+		}
 		return context{
 			state: stateError,
-			err:   errorf(ErrNoSuchTemplate, line, "no such template %s", name),
+			err:   errorf(ErrNoSuchTemplate, line, "no such template %q", name),
 		}, dname
 	}
 	if dname != name {
diff --git a/libgo/go/html/template/escape_test.go b/libgo/go/html/template/escape_test.go
index 2d15c718448..a57f9826b5b 100644
--- a/libgo/go/html/template/escape_test.go
+++ b/libgo/go/html/template/escape_test.go
@@ -928,7 +928,7 @@ func TestErrors(t *testing.T) {
 		},
 		{
 			`{{template "foo"}}`,
-			"z:1: no such template foo",
+			"z:1: no such template \"foo\"",
 		},
 		{
 			`<div{{template "y"}}>` +
@@ -944,23 +944,23 @@ func TestErrors(t *testing.T) {
 		},
 		{
 			`<input type=button value=onclick=>`,
-			`exp/template/html:z: "=" in unquoted attr: "onclick="`,
+			`html/template:z: "=" in unquoted attr: "onclick="`,
 		},
 		{
 			`<input type=button value= onclick=>`,
-			`exp/template/html:z: "=" in unquoted attr: "onclick="`,
+			`html/template:z: "=" in unquoted attr: "onclick="`,
 		},
 		{
 			`<input type=button value= 1+1=2>`,
-			`exp/template/html:z: "=" in unquoted attr: "1+1=2"`,
+			`html/template:z: "=" in unquoted attr: "1+1=2"`,
 		},
 		{
 			"<a class=`foo>",
-			"exp/template/html:z: \"`\" in unquoted attr: \"`foo\"",
+			"html/template:z: \"`\" in unquoted attr: \"`foo\"",
 		},
 		{
 			`<a style=font:'Arial'>`,
-			`exp/template/html:z: "'" in unquoted attr: "font:'Arial'"`,
+			`html/template:z: "'" in unquoted attr: "font:'Arial'"`,
 		},
 		{
 			`<a=foo>`,
diff --git a/libgo/go/image/color/ycbcr.go b/libgo/go/image/color/ycbcr.go
new file mode 100644
index 00000000000..c79816dd45a
--- /dev/null
+++ b/libgo/go/image/color/ycbcr.go
@@ -0,0 +1,99 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package color
+
+// RGBToYCbCr converts an RGB triple to a Y'CbCr triple. All components lie
+// within the range [0, 255].
+func RGBToYCbCr(r, g, b uint8) (uint8, uint8, uint8) {
+	// The JFIF specification says:
+	//	Y' =  0.2990*R + 0.5870*G + 0.1140*B
+	//	Cb = -0.1687*R - 0.3313*G + 0.5000*B + 128
+	//	Cr =  0.5000*R - 0.4187*G - 0.0813*B + 128
+	// http://www.w3.org/Graphics/JPEG/jfif3.pdf says Y but means Y'.
+	r1 := int(r)
+	g1 := int(g)
+	b1 := int(b)
+	yy := (19595*r1 + 38470*g1 + 7471*b1 + 1<<15) >> 16
+	cb := (-11056*r1 - 21712*g1 + 32768*b1 + 257<<15) >> 16
+	cr := (32768*r1 - 27440*g1 - 5328*b1 + 257<<15) >> 16
+	if yy < 0 {
+		yy = 0
+	} else if yy > 255 {
+		yy = 255
+	}
+	if cb < 0 {
+		cb = 0
+	} else if cb > 255 {
+		cb = 255
+	}
+	if cr < 0 {
+		cr = 0
+	} else if cr > 255 {
+		cr = 255
+	}
+	return uint8(yy), uint8(cb), uint8(cr)
+}
+
+// YCbCrToRGB converts a Y'CbCr triple to an RGB triple. All components lie
+// within the range [0, 255].
+func YCbCrToRGB(y, cb, cr uint8) (uint8, uint8, uint8) {
+	// The JFIF specification says:
+	//	R = Y' + 1.40200*(Cr-128)
+	//	G = Y' - 0.34414*(Cb-128) - 0.71414*(Cr-128)
+	//	B = Y' + 1.77200*(Cb-128)
+	// http://www.w3.org/Graphics/JPEG/jfif3.pdf says Y but means Y'.
+	yy1 := int(y)<<16 + 1<<15
+	cb1 := int(cb) - 128
+	cr1 := int(cr) - 128
+	r := (yy1 + 91881*cr1) >> 16
+	g := (yy1 - 22554*cb1 - 46802*cr1) >> 16
+	b := (yy1 + 116130*cb1) >> 16
+	if r < 0 {
+		r = 0
+	} else if r > 255 {
+		r = 255
+	}
+	if g < 0 {
+		g = 0
+	} else if g > 255 {
+		g = 255
+	}
+	if b < 0 {
+		b = 0
+	} else if b > 255 {
+		b = 255
+	}
+	return uint8(r), uint8(g), uint8(b)
+}
+
+// YCbCr represents a fully opaque 24-bit Y'CbCr color, having 8 bits each for
+// one luma and two chroma components.
+//
+// JPEG, VP8, the MPEG family and other codecs use this color model. Such
+// codecs often use the terms YUV and Y'CbCr interchangeably, but strictly
+// speaking, the term YUV applies only to analog video signals, and Y' (luma)
+// is Y (luminance) after applying gamma correction.
+//
+// Conversion between RGB and Y'CbCr is lossy and there are multiple, slightly
+// different formulae for converting between the two. This package follows
+// the JFIF specification at http://www.w3.org/Graphics/JPEG/jfif3.pdf.
+type YCbCr struct {
+	Y, Cb, Cr uint8
+}
+
+func (c YCbCr) RGBA() (uint32, uint32, uint32, uint32) {
+	r, g, b := YCbCrToRGB(c.Y, c.Cb, c.Cr)
+	return uint32(r) * 0x101, uint32(g) * 0x101, uint32(b) * 0x101, 0xffff
+}
+
+// YCbCrModel is the Model for Y'CbCr colors.
+var YCbCrModel Model = ModelFunc(func(c Color) Color {
+	if _, ok := c.(YCbCr); ok {
+		return c
+	}
+	r, g, b, _ := c.RGBA()
+	y, u, v := RGBToYCbCr(uint8(r>>8), uint8(g>>8), uint8(b>>8))
+	return YCbCr{y, u, v}
+})
diff --git a/libgo/go/image/ycbcr/ycbcr_test.go b/libgo/go/image/color/ycbcr_test.go
similarity index 98%
rename from libgo/go/image/ycbcr/ycbcr_test.go
rename to libgo/go/image/color/ycbcr_test.go
index 2e60a6f61f9..92a0e6ff1e7 100644
--- a/libgo/go/image/ycbcr/ycbcr_test.go
+++ b/libgo/go/image/color/ycbcr_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package ycbcr
+package color
 
 import (
 	"testing"
diff --git a/libgo/go/image/draw/bench_test.go b/libgo/go/image/draw/bench_test.go
index 2be91185af2..4cd2095c441 100644
--- a/libgo/go/image/draw/bench_test.go
+++ b/libgo/go/image/draw/bench_test.go
@@ -7,7 +7,6 @@ package draw
 import (
 	"image"
 	"image/color"
-	"image/ycbcr"
 	"testing"
 )
 
@@ -51,7 +50,7 @@ func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) {
 		}
 		dst = dst1
 	default:
-		panic("unreachable")
+		b.Fatal("unknown destination color model", dcm)
 	}
 
 	var src image.Image
@@ -97,7 +96,7 @@ func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) {
 			}
 		}
 		src = src1
-	case ycbcr.YCbCrColorModel:
+	case color.YCbCrModel:
 		yy := make([]uint8, srcw*srch)
 		cb := make([]uint8, srcw*srch)
 		cr := make([]uint8, srcw*srch)
@@ -106,17 +105,17 @@ func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) {
 			cb[i] = uint8(5 * i % 0x100)
 			cr[i] = uint8(7 * i % 0x100)
 		}
-		src = &ycbcr.YCbCr{
+		src = &image.YCbCr{
 			Y:              yy,
 			Cb:             cb,
 			Cr:             cr,
 			YStride:        srcw,
 			CStride:        srcw,
-			SubsampleRatio: ycbcr.SubsampleRatio444,
+			SubsampleRatio: image.YCbCrSubsampleRatio444,
 			Rect:           image.Rect(0, 0, srcw, srch),
 		}
 	default:
-		panic("unreachable")
+		b.Fatal("unknown source color model", scm)
 	}
 
 	var mask image.Image
@@ -137,7 +136,7 @@ func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) {
 		}
 		mask = mask1
 	default:
-		panic("unreachable")
+		b.Fatal("unknown mask color model", mcm)
 	}
 
 	b.StartTimer()
@@ -177,7 +176,7 @@ func BenchmarkNRGBASrc(b *testing.B) {
 }
 
 func BenchmarkYCbCr(b *testing.B) {
-	bench(b, color.RGBAModel, ycbcr.YCbCrColorModel, nil, Over)
+	bench(b, color.RGBAModel, color.YCbCrModel, nil, Over)
 }
 
 func BenchmarkGlyphOver(b *testing.B) {
diff --git a/libgo/go/image/draw/draw.go b/libgo/go/image/draw/draw.go
index af02639ccd5..228ed6e719c 100644
--- a/libgo/go/image/draw/draw.go
+++ b/libgo/go/image/draw/draw.go
@@ -11,7 +11,6 @@ package draw
 import (
 	"image"
 	"image/color"
-	"image/ycbcr"
 )
 
 // m is the maximum color value returned by image.Color.RGBA.
@@ -81,7 +80,7 @@ func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mas
 				case *image.NRGBA:
 					drawNRGBAOver(dst0, r, src0, sp)
 					return
-				case *ycbcr.YCbCr:
+				case *image.YCbCr:
 					drawYCbCr(dst0, r, src0, sp)
 					return
 				}
@@ -104,7 +103,7 @@ func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mas
 				case *image.NRGBA:
 					drawNRGBASrc(dst0, r, src0, sp)
 					return
-				case *ycbcr.YCbCr:
+				case *image.YCbCr:
 					drawYCbCr(dst0, r, src0, sp)
 					return
 				}
@@ -346,8 +345,8 @@ func drawNRGBASrc(dst *image.RGBA, r image.Rectangle, src *image.NRGBA, sp image
 	}
 }
 
-func drawYCbCr(dst *image.RGBA, r image.Rectangle, src *ycbcr.YCbCr, sp image.Point) {
-	// A YCbCr image is always fully opaque, and so if the mask is implicitly nil
+func drawYCbCr(dst *image.RGBA, r image.Rectangle, src *image.YCbCr, sp image.Point) {
+	// An image.YCbCr is always fully opaque, and so if the mask is implicitly nil
 	// (i.e. fully opaque) then the op is effectively always Src.
 	var (
 		yy, cb, cr uint8
@@ -357,7 +356,7 @@ func drawYCbCr(dst *image.RGBA, r image.Rectangle, src *ycbcr.YCbCr, sp image.Po
 	y0 := r.Min.Y - dst.Rect.Min.Y
 	y1 := r.Max.Y - dst.Rect.Min.Y
 	switch src.SubsampleRatio {
-	case ycbcr.SubsampleRatio422:
+	case image.YCbCrSubsampleRatio422:
 		for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 {
 			dpix := dst.Pix[y*dst.Stride:]
 			for x, sx := x0, sp.X; x != x1; x, sx = x+4, sx+1 {
@@ -365,14 +364,14 @@ func drawYCbCr(dst *image.RGBA, r image.Rectangle, src *ycbcr.YCbCr, sp image.Po
 				yy = src.Y[sy*src.YStride+sx]
 				cb = src.Cb[sy*src.CStride+i]
 				cr = src.Cr[sy*src.CStride+i]
-				rr, gg, bb := ycbcr.YCbCrToRGB(yy, cb, cr)
+				rr, gg, bb := color.YCbCrToRGB(yy, cb, cr)
 				dpix[x+0] = rr
 				dpix[x+1] = gg
 				dpix[x+2] = bb
 				dpix[x+3] = 255
 			}
 		}
-	case ycbcr.SubsampleRatio420:
+	case image.YCbCrSubsampleRatio420:
 		for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 {
 			dpix := dst.Pix[y*dst.Stride:]
 			for x, sx := x0, sp.X; x != x1; x, sx = x+4, sx+1 {
@@ -380,7 +379,7 @@ func drawYCbCr(dst *image.RGBA, r image.Rectangle, src *ycbcr.YCbCr, sp image.Po
 				yy = src.Y[sy*src.YStride+sx]
 				cb = src.Cb[j*src.CStride+i]
 				cr = src.Cr[j*src.CStride+i]
-				rr, gg, bb := ycbcr.YCbCrToRGB(yy, cb, cr)
+				rr, gg, bb := color.YCbCrToRGB(yy, cb, cr)
 				dpix[x+0] = rr
 				dpix[x+1] = gg
 				dpix[x+2] = bb
@@ -395,7 +394,7 @@ func drawYCbCr(dst *image.RGBA, r image.Rectangle, src *ycbcr.YCbCr, sp image.Po
 				yy = src.Y[sy*src.YStride+sx]
 				cb = src.Cb[sy*src.CStride+sx]
 				cr = src.Cr[sy*src.CStride+sx]
-				rr, gg, bb := ycbcr.YCbCrToRGB(yy, cb, cr)
+				rr, gg, bb := color.YCbCrToRGB(yy, cb, cr)
 				dpix[x+0] = rr
 				dpix[x+1] = gg
 				dpix[x+2] = bb
diff --git a/libgo/go/image/draw/draw_test.go b/libgo/go/image/draw/draw_test.go
index 663ab67a190..56a45026b57 100644
--- a/libgo/go/image/draw/draw_test.go
+++ b/libgo/go/image/draw/draw_test.go
@@ -7,7 +7,6 @@ package draw
 import (
 	"image"
 	"image/color"
-	"image/ycbcr"
 	"testing"
 )
 
@@ -56,13 +55,13 @@ func vgradGreenNRGBA(alpha int) image.Image {
 }
 
 func vgradCr() image.Image {
-	m := &ycbcr.YCbCr{
+	m := &image.YCbCr{
 		Y:              make([]byte, 16*16),
 		Cb:             make([]byte, 16*16),
 		Cr:             make([]byte, 16*16),
 		YStride:        16,
 		CStride:        16,
-		SubsampleRatio: ycbcr.SubsampleRatio444,
+		SubsampleRatio: image.YCbCrSubsampleRatio444,
 		Rect:           image.Rect(0, 0, 16, 16),
 	}
 	for y := 0; y < 16; y++ {
diff --git a/libgo/go/image/jpeg/reader.go b/libgo/go/image/jpeg/reader.go
index c1fc2d590f5..ed1a962586d 100644
--- a/libgo/go/image/jpeg/reader.go
+++ b/libgo/go/image/jpeg/reader.go
@@ -11,7 +11,6 @@ import (
 	"bufio"
 	"image"
 	"image/color"
-	"image/ycbcr"
 	"io"
 )
 
@@ -97,7 +96,7 @@ type decoder struct {
 	r             Reader
 	width, height int
 	img1          *image.Gray
-	img3          *ycbcr.YCbCr
+	img3          *image.YCbCr
 	ri            int // Restart Interval.
 	nComp         int
 	comp          [nColorComponent]component
@@ -203,20 +202,20 @@ func (d *decoder) makeImg(h0, v0, mxx, myy int) {
 		d.img1 = m.SubImage(image.Rect(0, 0, d.width, d.height)).(*image.Gray)
 		return
 	}
-	var subsampleRatio ycbcr.SubsampleRatio
+	var subsampleRatio image.YCbCrSubsampleRatio
 	n := h0 * v0
 	switch n {
 	case 1:
-		subsampleRatio = ycbcr.SubsampleRatio444
+		subsampleRatio = image.YCbCrSubsampleRatio444
 	case 2:
-		subsampleRatio = ycbcr.SubsampleRatio422
+		subsampleRatio = image.YCbCrSubsampleRatio422
 	case 4:
-		subsampleRatio = ycbcr.SubsampleRatio420
+		subsampleRatio = image.YCbCrSubsampleRatio420
 	default:
 		panic("unreachable")
 	}
 	b := make([]byte, mxx*myy*(1*8*8*n+2*8*8))
-	d.img3 = &ycbcr.YCbCr{
+	d.img3 = &image.YCbCr{
 		Y:              b[mxx*myy*(0*8*8*n+0*8*8) : mxx*myy*(1*8*8*n+0*8*8)],
 		Cb:             b[mxx*myy*(1*8*8*n+0*8*8) : mxx*myy*(1*8*8*n+1*8*8)],
 		Cr:             b[mxx*myy*(1*8*8*n+1*8*8) : mxx*myy*(1*8*8*n+2*8*8)],
@@ -466,7 +465,7 @@ func DecodeConfig(r io.Reader) (image.Config, error) {
 	case nGrayComponent:
 		return image.Config{color.GrayModel, d.width, d.height}, nil
 	case nColorComponent:
-		return image.Config{ycbcr.YCbCrColorModel, d.width, d.height}, nil
+		return image.Config{color.YCbCrModel, d.width, d.height}, nil
 	}
 	return image.Config{}, FormatError("missing SOF marker")
 }
diff --git a/libgo/go/image/jpeg/writer.go b/libgo/go/image/jpeg/writer.go
index fab0bd0bfc1..71fe37ce7ff 100644
--- a/libgo/go/image/jpeg/writer.go
+++ b/libgo/go/image/jpeg/writer.go
@@ -8,7 +8,7 @@ import (
 	"bufio"
 	"errors"
 	"image"
-	"image/ycbcr"
+	"image/color"
 	"io"
 )
 
@@ -379,7 +379,7 @@ func toYCbCr(m image.Image, p image.Point, yBlock, cbBlock, crBlock *block) {
 	for j := 0; j < 8; j++ {
 		for i := 0; i < 8; i++ {
 			r, g, b, _ := m.At(min(p.X+i, xmax), min(p.Y+j, ymax)).RGBA()
-			yy, cb, cr := ycbcr.RGBToYCbCr(uint8(r>>8), uint8(g>>8), uint8(b>>8))
+			yy, cb, cr := color.RGBToYCbCr(uint8(r>>8), uint8(g>>8), uint8(b>>8))
 			yBlock[8*j+i] = int(yy)
 			cbBlock[8*j+i] = int(cb)
 			crBlock[8*j+i] = int(cr)
@@ -404,7 +404,7 @@ func rgbaToYCbCr(m *image.RGBA, p image.Point, yBlock, cbBlock, crBlock *block)
 				sx = xmax
 			}
 			pix := m.Pix[offset+sx*4:]
-			yy, cb, cr := ycbcr.RGBToYCbCr(pix[0], pix[1], pix[2])
+			yy, cb, cr := color.RGBToYCbCr(pix[0], pix[1], pix[2])
 			yBlock[8*j+i] = int(yy)
 			cbBlock[8*j+i] = int(cb)
 			crBlock[8*j+i] = int(cr)
diff --git a/libgo/go/image/jpeg/writer_test.go b/libgo/go/image/jpeg/writer_test.go
index 28e87321361..e4b56d28847 100644
--- a/libgo/go/image/jpeg/writer_test.go
+++ b/libgo/go/image/jpeg/writer_test.go
@@ -105,7 +105,7 @@ func BenchmarkEncodeRGBOpaque(b *testing.B) {
 		}
 	}
 	if !img.Opaque() {
-		panic("expected image to be opaque")
+		b.Fatal("expected image to be opaque")
 	}
 	b.SetBytes(640 * 480 * 4)
 	b.StartTimer()
diff --git a/libgo/go/image/png/writer_test.go b/libgo/go/image/png/writer_test.go
index 1757e14cada..228ecccfb4f 100644
--- a/libgo/go/image/png/writer_test.go
+++ b/libgo/go/image/png/writer_test.go
@@ -125,7 +125,7 @@ func BenchmarkEncodeRGBOpaque(b *testing.B) {
 		}
 	}
 	if !img.Opaque() {
-		panic("expected image to be opaque")
+		b.Fatal("expected image to be opaque")
 	}
 	b.SetBytes(640 * 480 * 4)
 	b.StartTimer()
@@ -138,7 +138,7 @@ func BenchmarkEncodeRGBA(b *testing.B) {
 	b.StopTimer()
 	img := image.NewRGBA(image.Rect(0, 0, 640, 480))
 	if img.Opaque() {
-		panic("expected image to not be opaque")
+		b.Fatal("expected image to not be opaque")
 	}
 	b.SetBytes(640 * 480 * 4)
 	b.StartTimer()
diff --git a/libgo/go/image/tiff/reader_test.go b/libgo/go/image/tiff/reader_test.go
index 1a3d23bbd75..ee5dafd9962 100644
--- a/libgo/go/image/tiff/reader_test.go
+++ b/libgo/go/image/tiff/reader_test.go
@@ -113,7 +113,7 @@ func BenchmarkDecode(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		_, err := Decode(r)
 		if err != nil {
-			panic(err)
+			b.Fatal("Decode:", err)
 		}
 	}
 }
diff --git a/libgo/go/image/ycbcr.go b/libgo/go/image/ycbcr.go
new file mode 100644
index 00000000000..81f3c9fe03d
--- /dev/null
+++ b/libgo/go/image/ycbcr.go
@@ -0,0 +1,87 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package image
+
+import (
+	"image/color"
+)
+
+// YCbCrSubsampleRatio is the chroma subsample ratio used in a YCbCr image.
+type YCbCrSubsampleRatio int
+
+const (
+	YCbCrSubsampleRatio444 YCbCrSubsampleRatio = iota
+	YCbCrSubsampleRatio422
+	YCbCrSubsampleRatio420
+)
+
+// YCbCr is an in-memory image of Y'CbCr colors. There is one Y sample per
+// pixel, but each Cb and Cr sample can span one or more pixels.
+// YStride is the Y slice index delta between vertically adjacent pixels.
+// CStride is the Cb and Cr slice index delta between vertically adjacent pixels
+// that map to separate chroma samples.
+// It is not an absolute requirement, but YStride and len(Y) are typically
+// multiples of 8, and:
+//	For 4:4:4, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/1.
+//	For 4:2:2, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/2.
+//	For 4:2:0, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/4.
+type YCbCr struct {
+	Y              []uint8
+	Cb             []uint8
+	Cr             []uint8
+	YStride        int
+	CStride        int
+	SubsampleRatio YCbCrSubsampleRatio
+	Rect           Rectangle
+}
+
+func (p *YCbCr) ColorModel() color.Model {
+	return color.YCbCrModel
+}
+
+func (p *YCbCr) Bounds() Rectangle {
+	return p.Rect
+}
+
+func (p *YCbCr) At(x, y int) color.Color {
+	if !(Point{x, y}.In(p.Rect)) {
+		return color.YCbCr{}
+	}
+	switch p.SubsampleRatio {
+	case YCbCrSubsampleRatio422:
+		i := x / 2
+		return color.YCbCr{
+			p.Y[y*p.YStride+x],
+			p.Cb[y*p.CStride+i],
+			p.Cr[y*p.CStride+i],
+		}
+	case YCbCrSubsampleRatio420:
+		i, j := x/2, y/2
+		return color.YCbCr{
+			p.Y[y*p.YStride+x],
+			p.Cb[j*p.CStride+i],
+			p.Cr[j*p.CStride+i],
+		}
+	}
+	// Default to 4:4:4 subsampling.
+	return color.YCbCr{
+		p.Y[y*p.YStride+x],
+		p.Cb[y*p.CStride+x],
+		p.Cr[y*p.CStride+x],
+	}
+}
+
+// SubImage returns an image representing the portion of the image p visible
+// through r. The returned value shares pixels with the original image.
+func (p *YCbCr) SubImage(r Rectangle) Image {
+	q := new(YCbCr)
+	*q = *p
+	q.Rect = q.Rect.Intersect(r)
+	return q
+}
+
+func (p *YCbCr) Opaque() bool {
+	return true
+}
diff --git a/libgo/go/image/ycbcr/ycbcr.go b/libgo/go/image/ycbcr/ycbcr.go
deleted file mode 100644
index 84a35a3fb5e..00000000000
--- a/libgo/go/image/ycbcr/ycbcr.go
+++ /dev/null
@@ -1,184 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package ycbcr provides images from the Y'CbCr color model.
-//
-// JPEG, VP8, the MPEG family and other codecs use this color model. Such
-// codecs often use the terms YUV and Y'CbCr interchangeably, but strictly
-// speaking, the term YUV applies only to analog video signals.
-//
-// Conversion between RGB and Y'CbCr is lossy and there are multiple, slightly
-// different formulae for converting between the two. This package follows
-// the JFIF specification at http://www.w3.org/Graphics/JPEG/jfif3.pdf.
-package ycbcr
-
-import (
-	"image"
-	"image/color"
-)
-
-// RGBToYCbCr converts an RGB triple to a YCbCr triple. All components lie
-// within the range [0, 255].
-func RGBToYCbCr(r, g, b uint8) (uint8, uint8, uint8) {
-	// The JFIF specification says:
-	//	Y' =  0.2990*R + 0.5870*G + 0.1140*B
-	//	Cb = -0.1687*R - 0.3313*G + 0.5000*B + 128
-	//	Cr =  0.5000*R - 0.4187*G - 0.0813*B + 128
-	// http://www.w3.org/Graphics/JPEG/jfif3.pdf says Y but means Y'.
-	r1 := int(r)
-	g1 := int(g)
-	b1 := int(b)
-	yy := (19595*r1 + 38470*g1 + 7471*b1 + 1<<15) >> 16
-	cb := (-11056*r1 - 21712*g1 + 32768*b1 + 257<<15) >> 16
-	cr := (32768*r1 - 27440*g1 - 5328*b1 + 257<<15) >> 16
-	if yy < 0 {
-		yy = 0
-	} else if yy > 255 {
-		yy = 255
-	}
-	if cb < 0 {
-		cb = 0
-	} else if cb > 255 {
-		cb = 255
-	}
-	if cr < 0 {
-		cr = 0
-	} else if cr > 255 {
-		cr = 255
-	}
-	return uint8(yy), uint8(cb), uint8(cr)
-}
-
-// YCbCrToRGB converts a YCbCr triple to an RGB triple. All components lie
-// within the range [0, 255].
-func YCbCrToRGB(y, cb, cr uint8) (uint8, uint8, uint8) {
-	// The JFIF specification says:
-	//	R = Y' + 1.40200*(Cr-128)
-	//	G = Y' - 0.34414*(Cb-128) - 0.71414*(Cr-128)
-	//	B = Y' + 1.77200*(Cb-128)
-	// http://www.w3.org/Graphics/JPEG/jfif3.pdf says Y but means Y'.
-	yy1 := int(y)<<16 + 1<<15
-	cb1 := int(cb) - 128
-	cr1 := int(cr) - 128
-	r := (yy1 + 91881*cr1) >> 16
-	g := (yy1 - 22554*cb1 - 46802*cr1) >> 16
-	b := (yy1 + 116130*cb1) >> 16
-	if r < 0 {
-		r = 0
-	} else if r > 255 {
-		r = 255
-	}
-	if g < 0 {
-		g = 0
-	} else if g > 255 {
-		g = 255
-	}
-	if b < 0 {
-		b = 0
-	} else if b > 255 {
-		b = 255
-	}
-	return uint8(r), uint8(g), uint8(b)
-}
-
-// YCbCrColor represents a fully opaque 24-bit Y'CbCr color, having 8 bits for
-// each of one luma and two chroma components.
-type YCbCrColor struct {
-	Y, Cb, Cr uint8
-}
-
-func (c YCbCrColor) RGBA() (uint32, uint32, uint32, uint32) {
-	r, g, b := YCbCrToRGB(c.Y, c.Cb, c.Cr)
-	return uint32(r) * 0x101, uint32(g) * 0x101, uint32(b) * 0x101, 0xffff
-}
-
-func toYCbCrColor(c color.Color) color.Color {
-	if _, ok := c.(YCbCrColor); ok {
-		return c
-	}
-	r, g, b, _ := c.RGBA()
-	y, u, v := RGBToYCbCr(uint8(r>>8), uint8(g>>8), uint8(b>>8))
-	return YCbCrColor{y, u, v}
-}
-
-// YCbCrColorModel is the color model for YCbCrColor.
-var YCbCrColorModel color.Model = color.ModelFunc(toYCbCrColor)
-
-// SubsampleRatio is the chroma subsample ratio used in a YCbCr image.
-type SubsampleRatio int
-
-const (
-	SubsampleRatio444 SubsampleRatio = iota
-	SubsampleRatio422
-	SubsampleRatio420
-)
-
-// YCbCr is an in-memory image of YCbCr colors. There is one Y sample per pixel,
-// but each Cb and Cr sample can span one or more pixels.
-// YStride is the Y slice index delta between vertically adjacent pixels.
-// CStride is the Cb and Cr slice index delta between vertically adjacent pixels
-// that map to separate chroma samples.
-// It is not an absolute requirement, but YStride and len(Y) are typically
-// multiples of 8, and:
-//	For 4:4:4, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/1.
-//	For 4:2:2, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/2.
-//	For 4:2:0, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/4.
-type YCbCr struct {
-	Y              []uint8
-	Cb             []uint8
-	Cr             []uint8
-	YStride        int
-	CStride        int
-	SubsampleRatio SubsampleRatio
-	Rect           image.Rectangle
-}
-
-func (p *YCbCr) ColorModel() color.Model {
-	return YCbCrColorModel
-}
-
-func (p *YCbCr) Bounds() image.Rectangle {
-	return p.Rect
-}
-
-func (p *YCbCr) At(x, y int) color.Color {
-	if !(image.Point{x, y}.In(p.Rect)) {
-		return YCbCrColor{}
-	}
-	switch p.SubsampleRatio {
-	case SubsampleRatio422:
-		i := x / 2
-		return YCbCrColor{
-			p.Y[y*p.YStride+x],
-			p.Cb[y*p.CStride+i],
-			p.Cr[y*p.CStride+i],
-		}
-	case SubsampleRatio420:
-		i, j := x/2, y/2
-		return YCbCrColor{
-			p.Y[y*p.YStride+x],
-			p.Cb[j*p.CStride+i],
-			p.Cr[j*p.CStride+i],
-		}
-	}
-	// Default to 4:4:4 subsampling.
-	return YCbCrColor{
-		p.Y[y*p.YStride+x],
-		p.Cb[y*p.CStride+x],
-		p.Cr[y*p.CStride+x],
-	}
-}
-
-// SubImage returns an image representing the portion of the image p visible
-// through r. The returned value shares pixels with the original image.
-func (p *YCbCr) SubImage(r image.Rectangle) image.Image {
-	q := new(YCbCr)
-	*q = *p
-	q.Rect = q.Rect.Intersect(r)
-	return q
-}
-
-func (p *YCbCr) Opaque() bool {
-	return true
-}
diff --git a/libgo/go/io/ioutil/ioutil_test.go b/libgo/go/io/ioutil/ioutil_test.go
index 89d6815ad50..103066817cd 100644
--- a/libgo/go/io/ioutil/ioutil_test.go
+++ b/libgo/go/io/ioutil/ioutil_test.go
@@ -37,7 +37,11 @@ func TestReadFile(t *testing.T) {
 }
 
 func TestWriteFile(t *testing.T) {
-	filename := "_test/rumpelstilzchen"
+	f, err := TempFile("", "ioutil-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	filename := f.Name()
 	data := "Programming today is a race between software engineers striving to " +
 		"build bigger and better idiot-proof programs, and the Universe trying " +
 		"to produce bigger and better idiots. So far, the Universe is winning."
@@ -56,6 +60,7 @@ func TestWriteFile(t *testing.T) {
 	}
 
 	// cleanup
+	f.Close()
 	os.Remove(filename) // ignore error
 }
 
@@ -66,26 +71,28 @@ func TestReadDir(t *testing.T) {
 		t.Fatalf("ReadDir %s: error expected, none found", dirname)
 	}
 
-	dirname = "."
+	dirname = ".."
 	list, err := ReadDir(dirname)
 	if err != nil {
 		t.Fatalf("ReadDir %s: %v", dirname, err)
 	}
 
-	foundTest := false
-	foundTestDir := false
+/* Does not work in gccgo testing environment.
+	foundFile := false
+	foundSubDir := false
 	for _, dir := range list {
 		switch {
-		case !dir.IsDir() && dir.Name() == "ioutil_test.go":
-			foundTest = true
-		case dir.IsDir() && dir.Name() == "_test":
-			foundTestDir = true
+		case !dir.IsDir() && dir.Name() == "io_test.go":
+			foundFile = true
+		case dir.IsDir() && dir.Name() == "ioutil":
+			foundSubDir = true
 		}
 	}
-	if !foundTest {
-		t.Fatalf("ReadDir %s: test file not found", dirname)
+	if !foundFile {
+		t.Fatalf("ReadDir %s: io_test.go file not found", dirname)
 	}
-	if !foundTestDir {
-		t.Fatalf("ReadDir %s: _test directory not found", dirname)
+	if !foundSubDir {
+		t.Fatalf("ReadDir %s: ioutil directory not found", dirname)
 	}
+*/
 }
diff --git a/libgo/go/log/syslog/syslog.go b/libgo/go/log/syslog/syslog.go
index 546bc296a5f..914391af80d 100644
--- a/libgo/go/log/syslog/syslog.go
+++ b/libgo/go/log/syslog/syslog.go
@@ -92,11 +92,13 @@ func (w *Writer) Emerg(m string) (err error) {
 	_, err = w.writeString(LOG_EMERG, m)
 	return err
 }
+
 // Crit logs a message using the LOG_CRIT priority.
 func (w *Writer) Crit(m string) (err error) {
 	_, err = w.writeString(LOG_CRIT, m)
 	return err
 }
+
 // ERR logs a message using the LOG_ERR priority.
 func (w *Writer) Err(m string) (err error) {
 	_, err = w.writeString(LOG_ERR, m)
@@ -114,11 +116,13 @@ func (w *Writer) Notice(m string) (err error) {
 	_, err = w.writeString(LOG_NOTICE, m)
 	return err
 }
+
 // Info logs a message using the LOG_INFO priority.
 func (w *Writer) Info(m string) (err error) {
 	_, err = w.writeString(LOG_INFO, m)
 	return err
 }
+
 // Debug logs a message using the LOG_DEBUG priority.
 func (w *Writer) Debug(m string) (err error) {
 	_, err = w.writeString(LOG_DEBUG, m)
diff --git a/libgo/go/math/all_test.go b/libgo/go/math/all_test.go
index 0a3cb0315d2..101c8dd85b4 100644
--- a/libgo/go/math/all_test.go
+++ b/libgo/go/math/all_test.go
@@ -22,6 +22,7 @@ var vf = []float64{
 	1.8253080916808550e+00,
 	-8.6859247685756013e+00,
 }
+
 // The expected results below were computed by the high precision calculators
 // at http://keisan.casio.com/.  More exact input values (array vf[], above)
 // were obtained by printing them with "%.26f".  The answers were calculated
@@ -159,6 +160,7 @@ var cos = []float64{
 	-2.517729313893103197176091e-01,
 	-7.39241351595676573201918e-01,
 }
+
 // Results for 100000 * Pi + vf[i]
 var cosLarge = []float64{
 	2.634752141185559426744e-01,
@@ -514,6 +516,7 @@ var sin = []float64{
 	9.6778633541687993721617774e-01,
 	-6.734405869050344734943028e-01,
 }
+
 // Results for 100000 * Pi + vf[i]
 var sinLarge = []float64{
 	-9.646661658548936063912e-01,
@@ -563,6 +566,7 @@ var tan = []float64{
 	-3.843885560201130679995041e+00,
 	9.10988793377685105753416e-01,
 }
+
 // Results for 100000 * Pi + vf[i]
 var tanLarge = []float64{
 	-3.66131656475596512705e+00,
diff --git a/libgo/go/math/big/int_test.go b/libgo/go/math/big/int_test.go
index aa7c1949549..9c4b7301874 100644
--- a/libgo/go/math/big/int_test.go
+++ b/libgo/go/math/big/int_test.go
@@ -9,6 +9,7 @@ import (
 	"encoding/gob"
 	"encoding/hex"
 	"fmt"
+	"math/rand"
 	"testing"
 	"testing/quick"
 )
@@ -1405,3 +1406,9 @@ func TestIntGobEncoding(t *testing.T) {
 		}
 	}
 }
+
+func TestIssue2607(t *testing.T) {
+	// This code sequence used to hang.
+	n := NewInt(10)
+	n.Rand(rand.New(rand.NewSource(9)), n)
+}
diff --git a/libgo/go/math/big/nat.go b/libgo/go/math/big/nat.go
index ead1a881a6a..69681ae2d64 100644
--- a/libgo/go/math/big/nat.go
+++ b/libgo/go/math/big/nat.go
@@ -1196,12 +1196,16 @@ func (x nat) powersOfTwoDecompose() (q nat, k int) {
 // random creates a random integer in [0..limit), using the space in z if
 // possible. n is the bit length of limit.
 func (z nat) random(rand *rand.Rand, limit nat, n int) nat {
+	if alias(z, limit) {
+		z = nil // z is an alias for limit - cannot reuse
+	}
+	z = z.make(len(limit))
+
 	bitLengthOfMSW := uint(n % _W)
 	if bitLengthOfMSW == 0 {
 		bitLengthOfMSW = _W
 	}
 	mask := Word((1 << bitLengthOfMSW) - 1)
-	z = z.make(len(limit))
 
 	for {
 		for i := range z {
diff --git a/libgo/go/math/big/nat_test.go b/libgo/go/math/big/nat_test.go
index e3c6552d9fb..25e39273c0c 100644
--- a/libgo/go/math/big/nat_test.go
+++ b/libgo/go/math/big/nat_test.go
@@ -5,7 +5,6 @@
 package big
 
 import (
-	"fmt"
 	"io"
 	"strings"
 	"testing"
@@ -402,7 +401,7 @@ func ScanHelper(b *testing.B, base int, x, y Word) {
 	var s string
 	s = z.string(lowercaseDigits[0:base])
 	if t := toString(z, lowercaseDigits[0:base]); t != s {
-		panic(fmt.Sprintf("scanning: got %s; want %s", s, t))
+		b.Fatalf("scanning: got %s; want %s", s, t)
 	}
 	b.StartTimer()
 
diff --git a/libgo/go/math/sin.go b/libgo/go/math/sin.go
index 2fbe3e7ec5b..ebde7d43681 100644
--- a/libgo/go/math/sin.go
+++ b/libgo/go/math/sin.go
@@ -98,6 +98,7 @@ var _sin = [...]float64{
 	8.33333333332211858878E-3,  // 0x3f8111111110f7d0
 	-1.66666666666666307295E-1, // 0xbfc5555555555548
 }
+
 // cos coefficients
 var _cos = [...]float64{
 	-1.13585365213876817300E-11, // 0xbda8fa49a0861a9b
diff --git a/libgo/go/mime/type_unix.go b/libgo/go/mime/type_unix.go
index 45127ba29df..2dab1eac78d 100644
--- a/libgo/go/mime/type_unix.go
+++ b/libgo/go/mime/type_unix.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build darwin freebsd linux netbsd openbsd plan9
+
 package mime
 
 import (
diff --git a/libgo/go/net/cgo_stub.go b/libgo/go/net/cgo_stub.go
index fbe6150c26b..66aff837d0a 100644
--- a/libgo/go/net/cgo_stub.go
+++ b/libgo/go/net/cgo_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build openbsd
+// +build nocgo
 
 // Stub cgo routines for systems that do not use cgo to do network lookups.
 
diff --git a/libgo/go/net/dial.go b/libgo/go/net/dial.go
index 43866dcb51d..00acb8477d2 100644
--- a/libgo/go/net/dial.go
+++ b/libgo/go/net/dial.go
@@ -4,6 +4,10 @@
 
 package net
 
+import (
+	"time"
+)
+
 func resolveNetAddr(op, net, addr string) (a Addr, err error) {
 	if addr == "" {
 		return nil, &OpError{op, net, nil, errMissingAddress}
@@ -42,11 +46,15 @@ func resolveNetAddr(op, net, addr string) (a Addr, err error) {
 //	Dial("tcp", "google.com:80")
 //	Dial("tcp", "[de:ad:be:ef::ca:fe]:80")
 //
-func Dial(net, addr string) (c Conn, err error) {
+func Dial(net, addr string) (Conn, error) {
 	addri, err := resolveNetAddr("dial", net, addr)
 	if err != nil {
 		return nil, err
 	}
+	return dialAddr(net, addr, addri)
+}
+
+func dialAddr(net, addr string, addri Addr) (c Conn, err error) {
 	switch ra := addri.(type) {
 	case *TCPAddr:
 		c, err = DialTCP(net, nil, ra)
@@ -65,6 +73,62 @@ func Dial(net, addr string) (c Conn, err error) {
 	return
 }
 
+// DialTimeout acts like Dial but takes a timeout.
+// The timeout includes name resolution, if required.
+func DialTimeout(net, addr string, timeout time.Duration) (Conn, error) {
+	// TODO(bradfitz): the timeout should be pushed down into the
+	// net package's event loop, so on timeout to dead hosts we
+	// don't have a goroutine sticking around for the default of
+	// ~3 minutes.
+	t := time.NewTimer(timeout)
+	defer t.Stop()
+	type pair struct {
+		Conn
+		error
+	}
+	ch := make(chan pair, 1)
+	resolvedAddr := make(chan Addr, 1)
+	go func() {
+		addri, err := resolveNetAddr("dial", net, addr)
+		if err != nil {
+			ch <- pair{nil, err}
+			return
+		}
+		resolvedAddr <- addri // in case we need it for OpError
+		c, err := dialAddr(net, addr, addri)
+		ch <- pair{c, err}
+	}()
+	select {
+	case <-t.C:
+		// Try to use the real Addr in our OpError, if we resolved it
+		// before the timeout. Otherwise we just use stringAddr.
+		var addri Addr
+		select {
+		case a := <-resolvedAddr:
+			addri = a
+		default:
+			addri = &stringAddr{net, addr}
+		}
+		err := &OpError{
+			Op:   "dial",
+			Net:  net,
+			Addr: addri,
+			Err:  &timeoutError{},
+		}
+		return nil, err
+	case p := <-ch:
+		return p.Conn, p.error
+	}
+	panic("unreachable")
+}
+
+type stringAddr struct {
+	net, addr string
+}
+
+func (a stringAddr) Network() string { return a.net }
+func (a stringAddr) String() string  { return a.addr }
+
 // Listen announces on the local network address laddr.
 // The network string net must be a stream-oriented
 // network: "tcp", "tcp4", "tcp6", or "unix", or "unixpacket".
diff --git a/libgo/go/net/dial_test.go b/libgo/go/net/dial_test.go
new file mode 100644
index 00000000000..16b72631153
--- /dev/null
+++ b/libgo/go/net/dial_test.go
@@ -0,0 +1,88 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"runtime"
+	"testing"
+	"time"
+)
+
+func newLocalListener(t *testing.T) Listener {
+	ln, err := Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		ln, err = Listen("tcp6", "[::1]:0")
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	return ln
+}
+
+func TestDialTimeout(t *testing.T) {
+	ln := newLocalListener(t)
+	defer ln.Close()
+
+	errc := make(chan error)
+
+	const SOMAXCONN = 0x80 // copied from syscall, but not always available
+	const numConns = SOMAXCONN + 10
+
+	// TODO(bradfitz): It's hard to test this in a portable
+	// way. This is unforunate, but works for now.
+	switch runtime.GOOS {
+	case "linux":
+		// The kernel will start accepting TCP connections before userspace
+		// gets a chance to not accept them, so fire off a bunch to fill up
+		// the kernel's backlog.  Then we test we get a failure after that.
+		for i := 0; i < numConns; i++ {
+			go func() {
+				_, err := DialTimeout("tcp", ln.Addr().String(), 200*time.Millisecond)
+				errc <- err
+			}()
+		}
+	case "darwin":
+		// At least OS X 10.7 seems to accept any number of
+		// connections, ignoring listen's backlog, so resort
+		// to connecting to a hopefully-dead 127/8 address.
+		go func() {
+			_, err := DialTimeout("tcp", "127.0.71.111:80", 200*time.Millisecond)
+			errc <- err
+		}()
+	default:
+		// TODO(bradfitz): this probably doesn't work on
+		// Windows? SOMAXCONN is huge there.  I'm not sure how
+		// listen works there.
+		// OpenBSD may have a reject route to 10/8.
+		// FreeBSD likely works, but is untested.
+		t.Logf("skipping test on %q; untested.", runtime.GOOS)
+		return
+	}
+
+	connected := 0
+	for {
+		select {
+		case <-time.After(15 * time.Second):
+			t.Fatal("too slow")
+		case err := <-errc:
+			if err == nil {
+				connected++
+				if connected == numConns {
+					t.Fatal("all connections connected; expected some to time out")
+				}
+			} else {
+				terr, ok := err.(timeout)
+				if !ok {
+					t.Fatalf("got error %q; want error with timeout interface", err)
+				}
+				if !terr.Timeout() {
+					t.Fatalf("got error %q; not a timeout", err)
+				}
+				// Pass. We saw a timeout error.
+				return
+			}
+		}
+	}
+}
diff --git a/libgo/go/net/dnsclient_unix.go b/libgo/go/net/dnsclient_unix.go
index 79a958e3cd0..07e72ccb862 100644
--- a/libgo/go/net/dnsclient_unix.go
+++ b/libgo/go/net/dnsclient_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // DNS client: see RFC 1035.
 // Has to be linked into package net for Dial.
diff --git a/libgo/go/net/dnsconfig.go b/libgo/go/net/dnsconfig.go
index 379fec95b86..c0ab80288da 100644
--- a/libgo/go/net/dnsconfig.go
+++ b/libgo/go/net/dnsconfig.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Read system DNS config from /etc/resolv.conf
 
diff --git a/libgo/go/net/fd.go b/libgo/go/net/fd.go
index 5318c51c9a2..3dec9f4beb8 100644
--- a/libgo/go/net/fd.go
+++ b/libgo/go/net/fd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
@@ -377,14 +377,6 @@ func (fd *netFD) CloseWrite() error {
 	return fd.shutdown(syscall.SHUT_WR)
 }
 
-type timeoutError struct{}
-
-func (e *timeoutError) Error() string   { return "i/o timeout" }
-func (e *timeoutError) Timeout() bool   { return true }
-func (e *timeoutError) Temporary() bool { return true }
-
-var errTimeout error = &timeoutError{}
-
 func (fd *netFD) Read(p []byte) (n int, err error) {
 	if fd == nil {
 		return 0, os.EINVAL
diff --git a/libgo/go/net/fd_linux.go b/libgo/go/net/fd_linux.go
index 8e07833882e..c8df9c9326a 100644
--- a/libgo/go/net/fd_linux.go
+++ b/libgo/go/net/fd_linux.go
@@ -37,11 +37,17 @@ func newpollster() (p *pollster, err error) {
 	p = new(pollster)
 	var e error
 
-	// The arg to epoll_create is a hint to the kernel
-	// about the number of FDs we will care about.
-	// We don't know, and since 2.6.8 the kernel ignores it anyhow.
-	if p.epfd, e = syscall.EpollCreate(16); e != nil {
-		return nil, os.NewSyscallError("epoll_create", e)
+	if p.epfd, e = syscall.EpollCreate1(syscall.EPOLL_CLOEXEC); e != nil {
+		if e != syscall.ENOSYS {
+			return nil, os.NewSyscallError("epoll_create1", e)
+		}
+		// The arg to epoll_create is a hint to the kernel
+		// about the number of FDs we will care about.
+		// We don't know, and since 2.6.8 the kernel ignores it anyhow.
+		if p.epfd, e = syscall.EpollCreate(16); e != nil {
+			return nil, os.NewSyscallError("epoll_create", e)
+		}
+		syscall.CloseOnExec(p.epfd)
 	}
 	p.events = make(map[int]uint32)
 	return p, nil
diff --git a/libgo/go/net/fd_netbsd.go b/libgo/go/net/fd_netbsd.go
new file mode 100644
index 00000000000..31d0744e2cb
--- /dev/null
+++ b/libgo/go/net/fd_netbsd.go
@@ -0,0 +1,116 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Waiting for FDs via kqueue/kevent.
+
+package net
+
+import (
+	"os"
+	"syscall"
+)
+
+type pollster struct {
+	kq       int
+	eventbuf [10]syscall.Kevent_t
+	events   []syscall.Kevent_t
+
+	// An event buffer for AddFD/DelFD.
+	// Must hold pollServer lock.
+	kbuf [1]syscall.Kevent_t
+}
+
+func newpollster() (p *pollster, err error) {
+	p = new(pollster)
+	if p.kq, err = syscall.Kqueue(); err != nil {
+		return nil, os.NewSyscallError("kqueue", err)
+	}
+	syscall.CloseOnExec(p.kq)
+	p.events = p.eventbuf[0:0]
+	return p, nil
+}
+
+func (p *pollster) AddFD(fd int, mode int, repeat bool) (bool, error) {
+	// pollServer is locked.
+
+	var kmode int
+	if mode == 'r' {
+		kmode = syscall.EVFILT_READ
+	} else {
+		kmode = syscall.EVFILT_WRITE
+	}
+	ev := &p.kbuf[0]
+	// EV_ADD - add event to kqueue list
+	// EV_ONESHOT - delete the event the first time it triggers
+	flags := syscall.EV_ADD
+	if !repeat {
+		flags |= syscall.EV_ONESHOT
+	}
+	syscall.SetKevent(ev, fd, kmode, flags)
+
+	n, e := syscall.Kevent(p.kq, p.kbuf[:], nil, nil)
+	if e != nil {
+		return false, os.NewSyscallError("kevent", e)
+	}
+	if n != 1 || (ev.Flags&syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
+		return false, os.NewSyscallError("kqueue phase error", e)
+	}
+	if ev.Data != 0 {
+		return false, syscall.Errno(int(ev.Data))
+	}
+	return false, nil
+}
+
+func (p *pollster) DelFD(fd int, mode int) {
+	// pollServer is locked.
+
+	var kmode int
+	if mode == 'r' {
+		kmode = syscall.EVFILT_READ
+	} else {
+		kmode = syscall.EVFILT_WRITE
+	}
+	ev := &p.kbuf[0]
+	// EV_DELETE - delete event from kqueue list
+	syscall.SetKevent(ev, fd, kmode, syscall.EV_DELETE)
+	syscall.Kevent(p.kq, p.kbuf[:], nil, nil)
+}
+
+func (p *pollster) WaitFD(s *pollServer, nsec int64) (fd int, mode int, err error) {
+	var t *syscall.Timespec
+	for len(p.events) == 0 {
+		if nsec > 0 {
+			if t == nil {
+				t = new(syscall.Timespec)
+			}
+			*t = syscall.NsecToTimespec(nsec)
+		}
+
+		s.Unlock()
+		nn, e := syscall.Kevent(p.kq, nil, p.eventbuf[:], t)
+		s.Lock()
+
+		if e != nil {
+			if e == syscall.EINTR {
+				continue
+			}
+			return -1, 0, os.NewSyscallError("kevent", e)
+		}
+		if nn == 0 {
+			return -1, 0, nil
+		}
+		p.events = p.eventbuf[0:nn]
+	}
+	ev := &p.events[0]
+	p.events = p.events[1:]
+	fd = int(ev.Ident)
+	if ev.Filter == syscall.EVFILT_READ {
+		mode = 'r'
+	} else {
+		mode = 'w'
+	}
+	return fd, mode, nil
+}
+
+func (p *pollster) Close() error { return os.NewSyscallError("close", syscall.Close(p.kq)) }
diff --git a/libgo/go/net/fd_openbsd.go b/libgo/go/net/fd_openbsd.go
index e52ac356b9f..31d0744e2cb 100644
--- a/libgo/go/net/fd_openbsd.go
+++ b/libgo/go/net/fd_openbsd.go
@@ -26,6 +26,7 @@ func newpollster() (p *pollster, err error) {
 	if p.kq, err = syscall.Kqueue(); err != nil {
 		return nil, os.NewSyscallError("kqueue", err)
 	}
+	syscall.CloseOnExec(p.kq)
 	p.events = p.eventbuf[0:0]
 	return p, nil
 }
diff --git a/libgo/go/net/file.go b/libgo/go/net/file.go
index bf8cd9dae04..4ac280bd1a3 100644
--- a/libgo/go/net/file.go
+++ b/libgo/go/net/file.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
diff --git a/libgo/go/net/http/client.go b/libgo/go/net/http/client.go
index 211ac44c58a..a4f8f19aac8 100644
--- a/libgo/go/net/http/client.go
+++ b/libgo/go/net/http/client.go
@@ -38,6 +38,11 @@ type Client struct {
 	// If CheckRedirect is nil, the Client uses its default policy,
 	// which is to stop after 10 consecutive requests.
 	CheckRedirect func(req *Request, via []*Request) error
+
+	// Jar specifies the cookie jar. 
+	// If Jar is nil, cookies are not sent in requests and ignored 
+	// in responses.
+	Jar CookieJar
 }
 
 // DefaultClient is the default Client and is used by Get, Head, and Post.
@@ -180,6 +185,11 @@ func (c *Client) doFollowingRedirects(ireq *Request) (r *Response, err error) {
 		return nil, errors.New("http: nil Request.URL")
 	}
 
+	jar := c.Jar
+	if jar == nil {
+		jar = blackHoleJar{}
+	}
+
 	req := ireq
 	urlStr := "" // next relative or absolute URL to fetch (after first request)
 	for redirect := 0; ; redirect++ {
@@ -203,12 +213,19 @@ func (c *Client) doFollowingRedirects(ireq *Request) (r *Response, err error) {
 					break
 				}
 			}
+			for _, cookie := range jar.Cookies(req.URL) {
+				req.AddCookie(cookie)
+			}
 		}
 
 		urlStr = req.URL.String()
 		if r, err = send(req, c.Transport); err != nil {
 			break
 		}
+		if c := r.Cookies(); len(c) > 0 {
+			jar.SetCookies(req.URL, c)
+		}
+
 		if shouldRedirect(r.StatusCode) {
 			r.Body.Close()
 			if urlStr = r.Header.Get("Location"); urlStr == "" {
diff --git a/libgo/go/net/http/jar.go b/libgo/go/net/http/jar.go
new file mode 100644
index 00000000000..2c2caa251fe
--- /dev/null
+++ b/libgo/go/net/http/jar.go
@@ -0,0 +1,30 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package http
+
+import (
+	"net/url"
+)
+
+// A CookieJar manages storage and use of cookies in HTTP requests. 
+//
+// Implementations of CookieJar must be safe for concurrent use by multiple
+// goroutines.
+type CookieJar interface {
+	// SetCookies handles the receipt of the cookies in a reply for the 
+	// given URL.  It may or may not choose to save the cookies, depending 
+	// on the jar's policy and implementation. 
+	SetCookies(u *url.URL, cookies []*Cookie)
+
+	// Cookies returns the cookies to send in a request for the given URL.
+	// It is up to the implementation to honor the standard cookie use 
+	// restrictions such as in RFC 6265. 
+	Cookies(u *url.URL) []*Cookie
+}
+
+type blackHoleJar struct{}
+
+func (blackHoleJar) SetCookies(u *url.URL, cookies []*Cookie) {}
+func (blackHoleJar) Cookies(u *url.URL) []*Cookie             { return nil }
diff --git a/libgo/go/net/http/readrequest_test.go b/libgo/go/net/http/readrequest_test.go
index c64fff6109f..ad7e3c02b0c 100644
--- a/libgo/go/net/http/readrequest_test.go
+++ b/libgo/go/net/http/readrequest_test.go
@@ -219,7 +219,7 @@ func TestReadRequest(t *testing.T) {
 			t.Errorf("#%d: Body = %q want %q", i, body, tt.Body)
 		}
 		if !reflect.DeepEqual(tt.Trailer, req.Trailer) {
-			t.Errorf("%#d. Trailers differ.\n got: %v\nwant: %v", i, req.Trailer, tt.Trailer)
+			t.Errorf("#%d. Trailers differ.\n got: %v\nwant: %v", i, req.Trailer, tt.Trailer)
 		}
 	}
 }
diff --git a/libgo/go/net/http/request_test.go b/libgo/go/net/http/request_test.go
index 714cb64f47f..7b78645169e 100644
--- a/libgo/go/net/http/request_test.go
+++ b/libgo/go/net/http/request_test.go
@@ -202,8 +202,8 @@ func validateTestMultipartContents(t *testing.T, req *Request, allMem bool) {
 	if g, e := req.FormValue("texta"), textaValue; g != e {
 		t.Errorf("texta value = %q, want %q", g, e)
 	}
-	if g, e := req.FormValue("texta"), textaValue; g != e {
-		t.Errorf("texta value = %q, want %q", g, e)
+	if g, e := req.FormValue("textb"), textbValue; g != e {
+		t.Errorf("textb value = %q, want %q", g, e)
 	}
 	if g := req.FormValue("missing"); g != "" {
 		t.Errorf("missing value = %q, want empty string", g)
@@ -214,14 +214,16 @@ func validateTestMultipartContents(t *testing.T, req *Request, allMem bool) {
 			t.Error(n, " is *os.File, should not be")
 		}
 	}
-	fd := testMultipartFile(t, req, "filea", "filea.txt", fileaContents)
-	assertMem("filea", fd)
-	fd = testMultipartFile(t, req, "fileb", "fileb.txt", filebContents)
+	fda := testMultipartFile(t, req, "filea", "filea.txt", fileaContents)
+	defer fda.Close()
+	assertMem("filea", fda)
+	fdb := testMultipartFile(t, req, "fileb", "fileb.txt", filebContents)
+	defer fdb.Close()
 	if allMem {
-		assertMem("fileb", fd)
+		assertMem("fileb", fdb)
 	} else {
-		if _, ok := fd.(*os.File); !ok {
-			t.Errorf("fileb has unexpected underlying type %T", fd)
+		if _, ok := fdb.(*os.File); !ok {
+			t.Errorf("fileb has unexpected underlying type %T", fdb)
 		}
 	}
 
diff --git a/libgo/go/net/http/serve_test.go b/libgo/go/net/http/serve_test.go
index c68e6614b19..24e6b50dab8 100644
--- a/libgo/go/net/http/serve_test.go
+++ b/libgo/go/net/http/serve_test.go
@@ -1164,15 +1164,15 @@ func BenchmarkClientServer(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		res, err := Get(ts.URL)
 		if err != nil {
-			panic("Get: " + err.Error())
+			b.Fatal("Get:", err)
 		}
 		all, err := ioutil.ReadAll(res.Body)
 		if err != nil {
-			panic("ReadAll: " + err.Error())
+			b.Fatal("ReadAll:", err)
 		}
 		body := string(all)
 		if body != "Hello world.\n" {
-			panic("Got body: " + body)
+			b.Fatal("Got body:", body)
 		}
 	}
 
diff --git a/libgo/go/net/interface_bsd.go b/libgo/go/net/interface_bsd.go
index e896d43c321..907f80a80f3 100644
--- a/libgo/go/net/interface_bsd.go
+++ b/libgo/go/net/interface_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 // Network interface identification for BSD variants
 
@@ -18,21 +18,16 @@ import (
 // network interfaces.  Otheriwse it returns a mapping of a specific
 // interface.
 func interfaceTable(ifindex int) ([]Interface, error) {
-	var (
-		tab  []byte
-		e    error
-		msgs []syscall.RoutingMessage
-		ift  []Interface
-	)
+	var ift []Interface
 
-	tab, e = syscall.RouteRIB(syscall.NET_RT_IFLIST, ifindex)
-	if e != nil {
-		return nil, os.NewSyscallError("route rib", e)
+	tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST, ifindex)
+	if err != nil {
+		return nil, os.NewSyscallError("route rib", err)
 	}
 
-	msgs, e = syscall.ParseRoutingMessage(tab)
-	if e != nil {
-		return nil, os.NewSyscallError("route message", e)
+	msgs, err := syscall.ParseRoutingMessage(tab)
+	if err != nil {
+		return nil, os.NewSyscallError("route message", err)
 	}
 
 	for _, m := range msgs {
@@ -54,9 +49,9 @@ func interfaceTable(ifindex int) ([]Interface, error) {
 func newLink(m *syscall.InterfaceMessage) ([]Interface, error) {
 	var ift []Interface
 
-	sas, e := syscall.ParseRoutingSockaddr(m)
-	if e != nil {
-		return nil, os.NewSyscallError("route sockaddr", e)
+	sas, err := syscall.ParseRoutingSockaddr(m)
+	if err != nil {
+		return nil, os.NewSyscallError("route sockaddr", err)
 	}
 
 	for _, s := range sas {
@@ -108,21 +103,16 @@ func linkFlags(rawFlags int32) Flags {
 // for all network interfaces.  Otherwise it returns addresses
 // for a specific interface.
 func interfaceAddrTable(ifindex int) ([]Addr, error) {
-	var (
-		tab  []byte
-		e    error
-		msgs []syscall.RoutingMessage
-		ifat []Addr
-	)
+	var ifat []Addr
 
-	tab, e = syscall.RouteRIB(syscall.NET_RT_IFLIST, ifindex)
-	if e != nil {
-		return nil, os.NewSyscallError("route rib", e)
+	tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST, ifindex)
+	if err != nil {
+		return nil, os.NewSyscallError("route rib", err)
 	}
 
-	msgs, e = syscall.ParseRoutingMessage(tab)
-	if e != nil {
-		return nil, os.NewSyscallError("route message", e)
+	msgs, err := syscall.ParseRoutingMessage(tab)
+	if err != nil {
+		return nil, os.NewSyscallError("route message", err)
 	}
 
 	for _, m := range msgs {
@@ -133,7 +123,7 @@ func interfaceAddrTable(ifindex int) ([]Addr, error) {
 				if err != nil {
 					return nil, err
 				}
-				ifat = append(ifat, ifa...)
+				ifat = append(ifat, ifa)
 			}
 		}
 	}
@@ -141,32 +131,41 @@ func interfaceAddrTable(ifindex int) ([]Addr, error) {
 	return ifat, nil
 }
 
-func newAddr(m *syscall.InterfaceAddrMessage) ([]Addr, error) {
-	var ifat []Addr
+func newAddr(m *syscall.InterfaceAddrMessage) (Addr, error) {
+	ifa := &IPNet{}
 
-	sas, e := syscall.ParseRoutingSockaddr(m)
-	if e != nil {
-		return nil, os.NewSyscallError("route sockaddr", e)
+	sas, err := syscall.ParseRoutingSockaddr(m)
+	if err != nil {
+		return nil, os.NewSyscallError("route sockaddr", err)
 	}
 
-	for _, s := range sas {
+	for i, s := range sas {
 		switch v := s.(type) {
 		case *syscall.SockaddrInet4:
-			ifa := &IPAddr{IP: IPv4(v.Addr[0], v.Addr[1], v.Addr[2], v.Addr[3])}
-			ifat = append(ifat, ifa.toAddr())
-		case *syscall.SockaddrInet6:
-			ifa := &IPAddr{IP: make(IP, IPv6len)}
-			copy(ifa.IP, v.Addr[:])
-			// NOTE: KAME based IPv6 protcol stack usually embeds
-			// the interface index in the interface-local or link-
-			// local address as the kernel-internal form.
-			if ifa.IP.IsLinkLocalUnicast() {
-				// remove embedded scope zone ID
-				ifa.IP[2], ifa.IP[3] = 0, 0
+			switch i {
+			case 0:
+				ifa.Mask = IPv4Mask(v.Addr[0], v.Addr[1], v.Addr[2], v.Addr[3])
+			case 1:
+				ifa.IP = IPv4(v.Addr[0], v.Addr[1], v.Addr[2], v.Addr[3])
+			}
+		case *syscall.SockaddrInet6:
+			switch i {
+			case 0:
+				ifa.Mask = make(IPMask, IPv6len)
+				copy(ifa.Mask, v.Addr[:])
+			case 1:
+				ifa.IP = make(IP, IPv6len)
+				copy(ifa.IP, v.Addr[:])
+				// NOTE: KAME based IPv6 protcol stack usually embeds
+				// the interface index in the interface-local or link-
+				// local address as the kernel-internal form.
+				if ifa.IP.IsLinkLocalUnicast() {
+					// remove embedded scope zone ID
+					ifa.IP[2], ifa.IP[3] = 0, 0
+				}
 			}
-			ifat = append(ifat, ifa.toAddr())
 		}
 	}
 
-	return ifat, nil
+	return ifa, nil
 }
diff --git a/libgo/go/net/interface_linux.go b/libgo/go/net/interface_linux.go
index 96db7186af5..c0887c57efe 100644
--- a/libgo/go/net/interface_linux.go
+++ b/libgo/go/net/interface_linux.go
@@ -17,21 +17,16 @@ import (
 // network interfaces.  Otheriwse it returns a mapping of a specific
 // interface.
 func interfaceTable(ifindex int) ([]Interface, error) {
-	var (
-		ift  []Interface
-		tab  []byte
-		msgs []syscall.NetlinkMessage
-		e    error
-	)
+	var ift []Interface
 
-	tab, e = syscall.NetlinkRIB(syscall.RTM_GETLINK, syscall.AF_UNSPEC)
-	if e != nil {
-		return nil, os.NewSyscallError("netlink rib", e)
+	tab, err := syscall.NetlinkRIB(syscall.RTM_GETLINK, syscall.AF_UNSPEC)
+	if err != nil {
+		return nil, os.NewSyscallError("netlink rib", err)
 	}
 
-	msgs, e = syscall.ParseNetlinkMessage(tab)
-	if e != nil {
-		return nil, os.NewSyscallError("netlink message", e)
+	msgs, err := syscall.ParseNetlinkMessage(tab)
+	if err != nil {
+		return nil, os.NewSyscallError("netlink message", err)
 	}
 
 	for _, m := range msgs {
@@ -41,11 +36,11 @@ func interfaceTable(ifindex int) ([]Interface, error) {
 		case syscall.RTM_NEWLINK:
 			ifim := (*syscall.IfInfomsg)(unsafe.Pointer(&m.Data[0]))
 			if ifindex == 0 || ifindex == int(ifim.Index) {
-				attrs, e := syscall.ParseNetlinkRouteAttr(&m)
-				if e != nil {
-					return nil, os.NewSyscallError("netlink routeattr", e)
+				attrs, err := syscall.ParseNetlinkRouteAttr(&m)
+				if err != nil {
+					return nil, os.NewSyscallError("netlink routeattr", err)
 				}
-				ifi := newLink(attrs, ifim)
+				ifi := newLink(ifim, attrs)
 				ift = append(ift, ifi)
 			}
 		}
@@ -55,7 +50,7 @@ done:
 	return ift, nil
 }
 
-func newLink(attrs []syscall.NetlinkRouteAttr, ifim *syscall.IfInfomsg) Interface {
+func newLink(ifim *syscall.IfInfomsg, attrs []syscall.NetlinkRouteAttr) Interface {
 	ifi := Interface{Index: int(ifim.Index), Flags: linkFlags(ifim.Flags)}
 	for _, a := range attrs {
 		switch a.Attr.Type {
@@ -102,19 +97,19 @@ func linkFlags(rawFlags uint32) Flags {
 // for all network interfaces.  Otherwise it returns addresses
 // for a specific interface.
 func interfaceAddrTable(ifindex int) ([]Addr, error) {
-	tab, e := syscall.NetlinkRIB(syscall.RTM_GETADDR, syscall.AF_UNSPEC)
-	if e != nil {
-		return nil, os.NewSyscallError("netlink rib", e)
+	tab, err := syscall.NetlinkRIB(syscall.RTM_GETADDR, syscall.AF_UNSPEC)
+	if err != nil {
+		return nil, os.NewSyscallError("netlink rib", err)
 	}
 
-	msgs, e := syscall.ParseNetlinkMessage(tab)
-	if e != nil {
-		return nil, os.NewSyscallError("netlink message", e)
+	msgs, err := syscall.ParseNetlinkMessage(tab)
+	if err != nil {
+		return nil, os.NewSyscallError("netlink message", err)
 	}
 
-	ifat, e := addrTable(msgs, ifindex)
-	if e != nil {
-		return nil, e
+	ifat, err := addrTable(msgs, ifindex)
+	if err != nil {
+		return nil, err
 	}
 
 	return ifat, nil
@@ -130,11 +125,11 @@ func addrTable(msgs []syscall.NetlinkMessage, ifindex int) ([]Addr, error) {
 		case syscall.RTM_NEWADDR:
 			ifam := (*syscall.IfAddrmsg)(unsafe.Pointer(&m.Data[0]))
 			if ifindex == 0 || ifindex == int(ifam.Index) {
-				attrs, e := syscall.ParseNetlinkRouteAttr(&m)
-				if e != nil {
-					return nil, os.NewSyscallError("netlink routeattr", e)
+				attrs, err := syscall.ParseNetlinkRouteAttr(&m)
+				if err != nil {
+					return nil, os.NewSyscallError("netlink routeattr", err)
 				}
-				ifat = append(ifat, newAddr(attrs, int(ifam.Family))...)
+				ifat = append(ifat, newAddr(attrs, int(ifam.Family), int(ifam.Prefixlen)))
 			}
 		}
 	}
@@ -143,25 +138,23 @@ done:
 	return ifat, nil
 }
 
-func newAddr(attrs []syscall.NetlinkRouteAttr, family int) []Addr {
-	var ifat []Addr
-
+func newAddr(attrs []syscall.NetlinkRouteAttr, family, pfxlen int) Addr {
+	ifa := &IPNet{}
 	for _, a := range attrs {
 		switch a.Attr.Type {
 		case syscall.IFA_ADDRESS:
 			switch family {
 			case syscall.AF_INET:
-				ifa := &IPAddr{IP: IPv4(a.Value[0], a.Value[1], a.Value[2], a.Value[3])}
-				ifat = append(ifat, ifa.toAddr())
+				ifa.IP = IPv4(a.Value[0], a.Value[1], a.Value[2], a.Value[3])
+				ifa.Mask = CIDRMask(pfxlen, 8*IPv4len)
 			case syscall.AF_INET6:
-				ifa := &IPAddr{IP: make(IP, IPv6len)}
+				ifa.IP = make(IP, IPv6len)
 				copy(ifa.IP, a.Value[:])
-				ifat = append(ifat, ifa.toAddr())
+				ifa.Mask = CIDRMask(pfxlen, 8*IPv6len)
 			}
 		}
 	}
-
-	return ifat
+	return ifa
 }
 
 // If the ifindex is zero, interfaceMulticastAddrTable returns
@@ -169,8 +162,8 @@ func newAddr(attrs []syscall.NetlinkRouteAttr, family int) []Addr {
 // addresses for a specific interface.
 func interfaceMulticastAddrTable(ifindex int) ([]Addr, error) {
 	var (
-		ifi *Interface
 		err error
+		ifi *Interface
 	)
 
 	if ifindex > 0 {
diff --git a/libgo/go/net/interface_netbsd.go b/libgo/go/net/interface_netbsd.go
new file mode 100644
index 00000000000..4150e9ad5d1
--- /dev/null
+++ b/libgo/go/net/interface_netbsd.go
@@ -0,0 +1,14 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Network interface identification for NetBSD
+
+package net
+
+// If the ifindex is zero, interfaceMulticastAddrTable returns
+// addresses for all network interfaces.  Otherwise it returns
+// addresses for a specific interface.
+func interfaceMulticastAddrTable(ifindex int) ([]Addr, error) {
+	return nil, nil
+}
diff --git a/libgo/go/net/interface_test.go b/libgo/go/net/interface_test.go
index cc614910fac..4ce01dc9061 100644
--- a/libgo/go/net/interface_test.go
+++ b/libgo/go/net/interface_test.go
@@ -24,7 +24,7 @@ func sameInterface(i, j *Interface) bool {
 func TestInterfaces(t *testing.T) {
 	ift, err := Interfaces()
 	if err != nil {
-		t.Fatalf("Interfaces() failed: %v", err)
+		t.Fatalf("Interfaces failed: %v", err)
 	}
 	t.Logf("table: len/cap = %v/%v\n", len(ift), cap(ift))
 
@@ -43,34 +43,57 @@ func TestInterfaces(t *testing.T) {
 		if !sameInterface(ifxn, &ifi) {
 			t.Fatalf("InterfaceByName(%#q) = %v, want %v", ifi.Name, *ifxn, ifi)
 		}
-		ifat, err := ifi.Addrs()
-		if err != nil {
-			t.Fatalf("Interface.Addrs() failed: %v", err)
-		}
-		ifmat, err := ifi.MulticastAddrs()
-		if err != nil {
-			t.Fatalf("Interface.MulticastAddrs() failed: %v", err)
-		}
 		t.Logf("%q: flags %q, ifindex %v, mtu %v\n", ifi.Name, ifi.Flags.String(), ifi.Index, ifi.MTU)
-		for _, ifa := range ifat {
-			t.Logf("\tinterface address %q\n", ifa.String())
-		}
-		for _, ifma := range ifmat {
-			t.Logf("\tjoined group address %q\n", ifma.String())
-		}
 		t.Logf("\thardware address %q", ifi.HardwareAddr.String())
+		testInterfaceAddrs(t, &ifi)
+		testInterfaceMulticastAddrs(t, &ifi)
 	}
 }
 
 func TestInterfaceAddrs(t *testing.T) {
 	ifat, err := InterfaceAddrs()
 	if err != nil {
-		t.Fatalf("InterfaceAddrs() failed: %v", err)
+		t.Fatalf("InterfaceAddrs failed: %v", err)
 	}
 	t.Logf("table: len/cap = %v/%v\n", len(ifat), cap(ifat))
+	testAddrs(t, ifat)
+}
 
+func testInterfaceAddrs(t *testing.T, ifi *Interface) {
+	ifat, err := ifi.Addrs()
+	if err != nil {
+		t.Fatalf("Interface.Addrs failed: %v", err)
+	}
+	testAddrs(t, ifat)
+}
+
+func testInterfaceMulticastAddrs(t *testing.T, ifi *Interface) {
+	ifmat, err := ifi.MulticastAddrs()
+	if err != nil {
+		t.Fatalf("Interface.MulticastAddrs failed: %v", err)
+	}
+	testMulticastAddrs(t, ifmat)
+}
+
+func testAddrs(t *testing.T, ifat []Addr) {
 	for _, ifa := range ifat {
-		t.Logf("interface address %q\n", ifa.String())
+		switch ifa.(type) {
+		case *IPAddr, *IPNet:
+			t.Logf("\tinterface address %q\n", ifa.String())
+		default:
+			t.Errorf("\tunexpected type: %T", ifa)
+		}
+	}
+}
+
+func testMulticastAddrs(t *testing.T, ifmat []Addr) {
+	for _, ifma := range ifmat {
+		switch ifma.(type) {
+		case *IPAddr:
+			t.Logf("\tjoined group address %q\n", ifma.String())
+		default:
+			t.Errorf("\tunexpected type: %T", ifma)
+		}
 	}
 }
 
diff --git a/libgo/go/net/ip.go b/libgo/go/net/ip.go
index 4a388827875..979d7acd53d 100644
--- a/libgo/go/net/ip.go
+++ b/libgo/go/net/ip.go
@@ -450,6 +450,9 @@ func (n *IPNet) String() string {
 	return nn.String() + "/" + itod(uint(l))
 }
 
+// Network returns the address's network name, "ip+net".
+func (n *IPNet) Network() string { return "ip+net" }
+
 // Parse IPv4 address (d.d.d.d).
 func parseIPv4(s string) IP {
 	var p [IPv4len]byte
diff --git a/libgo/go/net/ipraw_test.go b/libgo/go/net/ipraw_test.go
index 60c405ab4ac..67a4049d5d3 100644
--- a/libgo/go/net/ipraw_test.go
+++ b/libgo/go/net/ipraw_test.go
@@ -59,6 +59,7 @@ func parsePingReply(p []byte) (id, seq int) {
 }
 
 var srchost = flag.String("srchost", "", "Source of the ICMP ECHO request")
+
 // 127.0.0.1 because this is an IPv4-specific test.
 var dsthost = flag.String("dsthost", "127.0.0.1", "Destination for the ICMP ECHO request")
 
diff --git a/libgo/go/net/iprawsock_posix.go b/libgo/go/net/iprawsock_posix.go
index d3cb38a6517..7bb4c7dc0d3 100644
--- a/libgo/go/net/iprawsock_posix.go
+++ b/libgo/go/net/iprawsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // (Raw) IP sockets
 
diff --git a/libgo/go/net/ipsock_posix.go b/libgo/go/net/ipsock_posix.go
index f0ca7dad345..d141c050b23 100644
--- a/libgo/go/net/ipsock_posix.go
+++ b/libgo/go/net/ipsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 package net
 
diff --git a/libgo/go/net/lookup_unix.go b/libgo/go/net/lookup_unix.go
index aae6d6ceb95..5c475477b83 100644
--- a/libgo/go/net/lookup_unix.go
+++ b/libgo/go/net/lookup_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
diff --git a/libgo/go/net/net.go b/libgo/go/net/net.go
index 48f0ae791c8..b236dfdb1dd 100644
--- a/libgo/go/net/net.go
+++ b/libgo/go/net/net.go
@@ -157,6 +157,14 @@ func (e *OpError) Timeout() bool {
 	return ok && t.Timeout()
 }
 
+type timeoutError struct{}
+
+func (e *timeoutError) Error() string   { return "i/o timeout" }
+func (e *timeoutError) Timeout() bool   { return true }
+func (e *timeoutError) Temporary() bool { return true }
+
+var errTimeout error = &timeoutError{}
+
 type AddrError struct {
 	Err  string
 	Addr string
diff --git a/libgo/go/net/newpollserver.go b/libgo/go/net/newpollserver.go
index 035df4a6ff1..a410bb6ce1f 100644
--- a/libgo/go/net/newpollserver.go
+++ b/libgo/go/net/newpollserver.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
diff --git a/libgo/go/net/port.go b/libgo/go/net/port.go
index 80597f7555d..16780da1160 100644
--- a/libgo/go/net/port.go
+++ b/libgo/go/net/port.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Read system port mappings from /etc/services
 
diff --git a/libgo/go/net/rpc/server_test.go b/libgo/go/net/rpc/server_test.go
index a52a86e414e..c1845fa5073 100644
--- a/libgo/go/net/rpc/server_test.go
+++ b/libgo/go/net/rpc/server_test.go
@@ -516,12 +516,10 @@ func benchmarkEndToEnd(dial func() (*Client, error), b *testing.B) {
 			for atomic.AddInt32(&N, -1) >= 0 {
 				err = client.Call("Arith.Add", args, reply)
 				if err != nil {
-					fmt.Printf("Add: expected no error but got string %q", err.Error())
-					panic("rpc error")
+					b.Fatalf("rpc error: Add: expected no error but got string %q", err.Error())
 				}
 				if reply.C != args.A+args.B {
-					fmt.Printf("Add: expected %d got %d", reply.C, args.A+args.B)
-					panic("rpc error")
+					b.Fatalf("rpc error: Add: expected %d got %d", reply.C, args.A+args.B)
 				}
 			}
 			wg.Done()
@@ -536,8 +534,7 @@ func benchmarkEndToEndAsync(dial func() (*Client, error), b *testing.B) {
 	once.Do(startServer)
 	client, err := dial()
 	if err != nil {
-		fmt.Println("error dialing", err)
-		return
+		b.Fatalf("error dialing:", err)
 	}
 
 	// Asynchronous calls
@@ -561,12 +558,11 @@ func benchmarkEndToEndAsync(dial func() (*Client, error), b *testing.B) {
 		}()
 		go func() {
 			for call := range res {
-				a := call.Args.(*Args).A
-				b := call.Args.(*Args).B
-				c := call.Reply.(*Reply).C
-				if a+b != c {
-					fmt.Printf("Add: expected %d got %d", a+b, c)
-					panic("incorrect reply")
+				A := call.Args.(*Args).A
+				B := call.Args.(*Args).B
+				C := call.Reply.(*Reply).C
+				if A+B != C {
+					b.Fatalf("incorrect reply: Add: expected %d got %d", A+B, C)
 				}
 				<-gate
 				if atomic.AddInt32(&recv, -1) == 0 {
diff --git a/libgo/go/net/sendfile_stub.go b/libgo/go/net/sendfile_stub.go
index b0adea47873..ff76ab9cf0e 100644
--- a/libgo/go/net/sendfile_stub.go
+++ b/libgo/go/net/sendfile_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 package net
 
diff --git a/libgo/go/net/sock.go b/libgo/go/net/sock.go
index 777f204b186..dc073927eb4 100644
--- a/libgo/go/net/sock.go
+++ b/libgo/go/net/sock.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // Sockets
 
diff --git a/libgo/go/net/sock_bsd.go b/libgo/go/net/sock_bsd.go
index 7025edf7421..816e4fc3f74 100644
--- a/libgo/go/net/sock_bsd.go
+++ b/libgo/go/net/sock_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 // Sockets for BSD variants
 
diff --git a/libgo/go/net/tcpsock_posix.go b/libgo/go/net/tcpsock_posix.go
index 44890ba66bb..a7c09c73ed5 100644
--- a/libgo/go/net/tcpsock_posix.go
+++ b/libgo/go/net/tcpsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // TCP sockets
 
diff --git a/libgo/go/net/textproto/reader_test.go b/libgo/go/net/textproto/reader_test.go
index 5aefe39867d..0460c1c8dee 100644
--- a/libgo/go/net/textproto/reader_test.go
+++ b/libgo/go/net/textproto/reader_test.go
@@ -203,7 +203,7 @@ func TestRFC959Lines(t *testing.T) {
 			t.Errorf("#%d: code=%d, want %d", i, code, tt.wantCode)
 		}
 		if msg != tt.wantMsg {
-			t.Errorf("%#d: msg=%q, want %q", i, msg, tt.wantMsg)
+			t.Errorf("#%d: msg=%q, want %q", i, msg, tt.wantMsg)
 		}
 	}
 }
diff --git a/libgo/go/net/udpsock_posix.go b/libgo/go/net/udpsock_posix.go
index c25ec9c506a..6bb15714e2b 100644
--- a/libgo/go/net/udpsock_posix.go
+++ b/libgo/go/net/udpsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // UDP sockets
 
diff --git a/libgo/go/net/unixsock_posix.go b/libgo/go/net/unixsock_posix.go
index 929f6409a4f..10632c1412e 100644
--- a/libgo/go/net/unixsock_posix.go
+++ b/libgo/go/net/unixsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // Unix domain sockets
 
diff --git a/libgo/go/old/regexp/all_test.go b/libgo/go/old/regexp/all_test.go
index 9a04360dd11..180dac4d455 100644
--- a/libgo/go/old/regexp/all_test.go
+++ b/libgo/go/old/regexp/all_test.go
@@ -321,8 +321,7 @@ func BenchmarkLiteral(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatal("no match!")
 		}
 	}
 }
@@ -334,8 +333,7 @@ func BenchmarkNotLiteral(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatal("no match!")
 		}
 	}
 }
@@ -347,8 +345,7 @@ func BenchmarkMatchClass(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatal("no match!")
 		}
 	}
 }
@@ -362,8 +359,7 @@ func BenchmarkMatchClass_InRange(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatal("no match!")
 		}
 	}
 }
diff --git a/libgo/go/old/template/template_test.go b/libgo/go/old/template/template_test.go
index a6e0c3e1b4e..f42a61a1b13 100644
--- a/libgo/go/old/template/template_test.go
+++ b/libgo/go/old/template/template_test.go
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"os"
 	"strings"
 	"testing"
 )
@@ -463,23 +464,32 @@ func TestAll(t *testing.T) {
 	// Parse
 	testAll(t, func(test *Test) (*Template, error) { return Parse(test.in, formatters) })
 	// ParseFile
+	f, err := ioutil.TempFile("", "template-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		name := f.Name()
+		f.Close()
+		os.Remove(name)
+	}()
 	testAll(t, func(test *Test) (*Template, error) {
-		err := ioutil.WriteFile("_test/test.tmpl", []byte(test.in), 0600)
+		err := ioutil.WriteFile(f.Name(), []byte(test.in), 0600)
 		if err != nil {
 			t.Error("unexpected write error:", err)
 			return nil, err
 		}
-		return ParseFile("_test/test.tmpl", formatters)
+		return ParseFile(f.Name(), formatters)
 	})
 	// tmpl.ParseFile
 	testAll(t, func(test *Test) (*Template, error) {
-		err := ioutil.WriteFile("_test/test.tmpl", []byte(test.in), 0600)
+		err := ioutil.WriteFile(f.Name(), []byte(test.in), 0600)
 		if err != nil {
 			t.Error("unexpected write error:", err)
 			return nil, err
 		}
 		tmpl := New(formatters)
-		return tmpl, tmpl.ParseFile("_test/test.tmpl")
+		return tmpl, tmpl.ParseFile(f.Name())
 	})
 }
 
diff --git a/libgo/go/os/dir_unix.go b/libgo/go/os/dir_unix.go
index e4dff835d89..e7a29554c15 100644
--- a/libgo/go/os/dir_unix.go
+++ b/libgo/go/os/dir_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package os
 
diff --git a/libgo/go/os/error_posix.go b/libgo/go/os/error_posix.go
index dbe1b9a8d5e..ebbe4369703 100644
--- a/libgo/go/os/error_posix.go
+++ b/libgo/go/os/error_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 package os
 
diff --git a/libgo/go/os/exec/exec.go b/libgo/go/os/exec/exec.go
index 4c95c1b0dac..a00fdad497f 100644
--- a/libgo/go/os/exec/exec.go
+++ b/libgo/go/os/exec/exec.go
@@ -67,6 +67,9 @@ type Cmd struct {
 	// ExtraFiles specifies additional open files to be inherited by the
 	// new process. It does not include standard input, standard output, or
 	// standard error. If non-nil, entry i becomes file descriptor 3+i.
+	//
+	// BUG: on OS X 10.6, child processes may sometimes inherit extra fds.
+	// http://golang.org/issue/2603
 	ExtraFiles []*os.File
 
 	// SysProcAttr holds optional, operating system-specific attributes.
diff --git a/libgo/go/os/exec/exec_test.go b/libgo/go/os/exec/exec_test.go
index 8f63653c014..c68498047fa 100644
--- a/libgo/go/os/exec/exec_test.go
+++ b/libgo/go/os/exec/exec_test.go
@@ -10,6 +10,9 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"net"
+	"net/http"
+	"net/http/httptest"
 	"os"
 	"runtime"
 	"strconv"
@@ -18,7 +21,7 @@ import (
 )
 
 func helperCommand(s ...string) *Cmd {
-	cs := []string{"-test.run=exec.TestHelperProcess", "--"}
+	cs := []string{"-test.run=TestHelperProcess", "--"}
 	cs = append(cs, s...)
 	cmd := Command(os.Args[0], cs...)
 	cmd.Env = append([]string{"GO_WANT_HELPER_PROCESS=1"}, os.Environ()...)
@@ -146,6 +149,23 @@ func TestExtraFiles(t *testing.T) {
 		t.Logf("no operating system support; skipping")
 		return
 	}
+
+	// Force network usage, to verify the epoll (or whatever) fd
+	// doesn't leak to the child,
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer ln.Close()
+
+	// Force TLS root certs to be loaded (which might involve
+	// cgo), to make sure none of that potential C code leaks fds.
+	ts := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("Hello"))
+	}))
+	defer ts.Close()
+	http.Get(ts.URL) // ignore result; just calling to force root cert loading
+
 	tf, err := ioutil.TempFile("", "")
 	if err != nil {
 		t.Fatalf("TempFile: %v", err)
@@ -167,7 +187,7 @@ func TestExtraFiles(t *testing.T) {
 	c.ExtraFiles = []*os.File{tf}
 	bs, err := c.CombinedOutput()
 	if err != nil {
-		t.Fatalf("CombinedOutput: %v", err)
+		t.Fatalf("CombinedOutput: %v; output %q", err, bs)
 	}
 	if string(bs) != text {
 		t.Errorf("got %q; want %q", string(bs), text)
@@ -246,6 +266,32 @@ func TestHelperProcess(*testing.T) {
 			fmt.Printf("ReadAll from fd 3: %v", err)
 			os.Exit(1)
 		}
+		switch runtime.GOOS {
+		case "darwin":
+			// TODO(bradfitz): broken? Sometimes.
+			// http://golang.org/issue/2603
+			// Skip this additional part of the test for now.
+		default:
+			// Now verify that there are no other open fds.
+			var files []*os.File
+			for wantfd := os.Stderr.Fd() + 2; wantfd <= 100; wantfd++ {
+				f, err := os.Open(os.Args[0])
+				if err != nil {
+					fmt.Printf("error opening file with expected fd %d: %v", wantfd, err)
+					os.Exit(1)
+				}
+				if got := f.Fd(); got != wantfd {
+					fmt.Printf("leaked parent file. fd = %d; want %d\n", got, wantfd)
+					out, _ := Command("lsof", "-p", fmt.Sprint(os.Getpid())).CombinedOutput()
+					fmt.Print(string(out))
+					os.Exit(1)
+				}
+				files = append(files, f)
+			}
+			for _, f := range files {
+				f.Close()
+			}
+		}
 		os.Stderr.Write(bs)
 	case "exit":
 		n, _ := strconv.Atoi(args[0])
diff --git a/libgo/go/os/exec/lp_unix.go b/libgo/go/os/exec/lp_unix.go
index 9665ea8f413..a221137230d 100644
--- a/libgo/go/os/exec/lp_unix.go
+++ b/libgo/go/os/exec/lp_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package exec
 
diff --git a/libgo/go/os/exec_posix.go b/libgo/go/os/exec_posix.go
index 8b08eebd0da..218b8cdc1d6 100644
--- a/libgo/go/os/exec_posix.go
+++ b/libgo/go/os/exec_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 package os
 
@@ -24,7 +24,7 @@ func (sig UnixSignal) String() string {
 // StartProcess starts a new process with the program, arguments and attributes
 // specified by name, argv and attr.
 //
-// StartProcess is a low-level interface. The exec package provides
+// StartProcess is a low-level interface. The os/exec package provides
 // higher-level interfaces.
 func StartProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
 	sysattr := &syscall.ProcAttr{
@@ -56,7 +56,7 @@ func (p *Process) Kill() error {
 // If successful, Exec never returns.  If it fails, it returns an error.
 //
 // To run a child process, see StartProcess (for a low-level interface)
-// or the exec package (for higher-level interfaces).
+// or the os/exec package (for higher-level interfaces).
 func Exec(name string, argv []string, envv []string) error {
 	if envv == nil {
 		envv = Environ()
diff --git a/libgo/go/os/exec_unix.go b/libgo/go/os/exec_unix.go
index 3dcac414c5a..375813895d9 100644
--- a/libgo/go/os/exec_unix.go
+++ b/libgo/go/os/exec_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package os
 
diff --git a/libgo/go/os/file_posix.go b/libgo/go/os/file_posix.go
index a4ab5d6ae25..8231ef4817c 100644
--- a/libgo/go/os/file_posix.go
+++ b/libgo/go/os/file_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 package os
 
@@ -24,39 +24,6 @@ func epipecheck(file *File, e error) {
 	}
 }
 
-// Remove removes the named file or directory.
-func Remove(name string) error {
-	// System call interface forces us to know
-	// whether name is a file or directory.
-	// Try both: it is cheaper on average than
-	// doing a Stat plus the right one.
-	e := syscall.Unlink(name)
-	if e == nil {
-		return nil
-	}
-	e1 := syscall.Rmdir(name)
-	if e1 == nil {
-		return nil
-	}
-
-	// Both failed: figure out which error to return.
-	// OS X and Linux differ on whether unlink(dir)
-	// returns EISDIR, so can't use that.  However,
-	// both agree that rmdir(file) returns ENOTDIR,
-	// so we can use that to decide which error is real.
-	// Rmdir might also return ENOTDIR if given a bad
-	// file path, like /etc/passwd/foo, but in that case,
-	// both errors will be ENOTDIR, so it's okay to
-	// use the error from unlink.
-	// For windows syscall.ENOTDIR is set
-	// to syscall.ERROR_PATH_NOT_FOUND, hopefully it should
-	// do the trick.
-	if e1 != syscall.ENOTDIR {
-		e = e1
-	}
-	return &PathError{"remove", name, e}
-}
-
 // LinkError records an error during a link or symlink or rename
 // system call and the paths that caused it.
 type LinkError struct {
diff --git a/libgo/go/os/file_unix.go b/libgo/go/os/file_unix.go
index 671d1a4cb62..069baa14d4e 100644
--- a/libgo/go/os/file_unix.go
+++ b/libgo/go/os/file_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package os
 
@@ -67,8 +67,13 @@ func OpenFile(name string, flag int, perm uint32) (file *File, err error) {
 	}
 
 	// There's a race here with fork/exec, which we are
-	// content to live with.  See ../syscall/exec.go
-	if syscall.O_CLOEXEC == 0 { // O_CLOEXEC not supported
+	// content to live with.  See ../syscall/exec_unix.go.
+	// On OS X 10.6, the O_CLOEXEC flag is not respected.
+	// On OS X 10.7, the O_CLOEXEC flag works.
+	// Without a cheap & reliable way to detect 10.6 vs 10.7 at
+	// runtime, we just always call syscall.CloseOnExec on Darwin.
+	// Once >=10.7 is prevalent, this extra call can removed.
+	if syscall.O_CLOEXEC == 0 || runtime.GOOS == "darwin" { // O_CLOEXEC not supported
 		syscall.CloseOnExec(r)
 	}
 
@@ -216,6 +221,36 @@ func Truncate(name string, size int64) error {
 	return nil
 }
 
+// Remove removes the named file or directory.
+func Remove(name string) error {
+	// System call interface forces us to know
+	// whether name is a file or directory.
+	// Try both: it is cheaper on average than
+	// doing a Stat plus the right one.
+	e := syscall.Unlink(name)
+	if e == nil {
+		return nil
+	}
+	e1 := syscall.Rmdir(name)
+	if e1 == nil {
+		return nil
+	}
+
+	// Both failed: figure out which error to return.
+	// OS X and Linux differ on whether unlink(dir)
+	// returns EISDIR, so can't use that.  However,
+	// both agree that rmdir(file) returns ENOTDIR,
+	// so we can use that to decide which error is real.
+	// Rmdir might also return ENOTDIR if given a bad
+	// file path, like /etc/passwd/foo, but in that case,
+	// both errors will be ENOTDIR, so it's okay to
+	// use the error from unlink.
+	if e1 != syscall.ENOTDIR {
+		e = e1
+	}
+	return &PathError{"remove", name, e}
+}
+
 // basename removes trailing slashes and the leading directory name from path name
 func basename(name string) string {
 	i := len(name) - 1
diff --git a/libgo/go/os/os_test.go b/libgo/go/os/os_test.go
index 299d2e86155..9a609908034 100644
--- a/libgo/go/os/os_test.go
+++ b/libgo/go/os/os_test.go
@@ -917,7 +917,7 @@ func TestReadAt(t *testing.T) {
 	b := make([]byte, 5)
 	n, err := f.ReadAt(b, 7)
 	if err != nil || n != len(b) {
-		t.Fatalf("ReadAt 7: %d, %r", n, err)
+		t.Fatalf("ReadAt 7: %d, %v", n, err)
 	}
 	if string(b) != "world" {
 		t.Fatalf("ReadAt 7: have %q want %q", string(b), "world")
diff --git a/libgo/go/os/os_unix_test.go b/libgo/go/os/os_unix_test.go
index 3109a8171a5..1f800d78cca 100644
--- a/libgo/go/os/os_unix_test.go
+++ b/libgo/go/os/os_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package os_test
 
diff --git a/libgo/go/os/path_unix.go b/libgo/go/os/path_unix.go
index 33045b60c45..30a167b1adc 100644
--- a/libgo/go/os/path_unix.go
+++ b/libgo/go/os/path_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package os
 
diff --git a/libgo/go/os/signal/signal.go b/libgo/go/os/signal/signal.go
index 520f3f8a9ea..bce4530e7bc 100644
--- a/libgo/go/os/signal/signal.go
+++ b/libgo/go/os/signal/signal.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build darwin freebsd linux netbsd openbsd
+
 // Package signal implements operating system-independent signal handling.
 package signal
 
@@ -31,3 +33,5 @@ func init() {
 	Incoming = ch
 	go process(ch)
 }
+
+// BUG(rsc): This package is unavailable on Plan 9 and Windows.
diff --git a/libgo/go/os/signal/signal_test.go b/libgo/go/os/signal/signal_test.go
index 00eb29578f9..4568aa9518e 100644
--- a/libgo/go/os/signal/signal_test.go
+++ b/libgo/go/os/signal/signal_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build darwin freebsd linux netbsd openbsd
+
 package signal
 
 import (
diff --git a/libgo/go/os/sys_bsd.go b/libgo/go/os/sys_bsd.go
index c6a6de5c816..d196469e7d4 100644
--- a/libgo/go/os/sys_bsd.go
+++ b/libgo/go/os/sys_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 // os code shared between *BSD systems including OS X (Darwin)
 // and FreeBSD.
diff --git a/libgo/go/os/user/lookup_stubs.go b/libgo/go/os/user/lookup_stubs.go
index 0999dedbb95..42fa557445f 100644
--- a/libgo/go/os/user/lookup_stubs.go
+++ b/libgo/go/os/user/lookup_stubs.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build openbsd plan9 windows
+// +build nocgo windows
 
 package user
 
diff --git a/libgo/go/os/user/lookup_unix.go b/libgo/go/os/user/lookup_unix.go
index 89886cb03cf..602a3da2cd4 100644
--- a/libgo/go/os/user/lookup_unix.go
+++ b/libgo/go/os/user/lookup_unix.go
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build darwin freebsd linux
+// +build cgo
 
 package user
 
diff --git a/libgo/go/path/filepath/path.go b/libgo/go/path/filepath/path.go
index e3d6c342ca6..3dc52aab467 100644
--- a/libgo/go/path/filepath/path.go
+++ b/libgo/go/path/filepath/path.go
@@ -147,6 +147,7 @@ func SplitList(path string) []string {
 // separating it into a directory and file name component.
 // If there is no Separator in path, Split returns an empty dir
 // and file set to path.
+// The returned values have the property that path = dir+file.
 func Split(path string) (dir, file string) {
 	vol := VolumeName(path)
 	i := len(path) - 1
@@ -262,6 +263,8 @@ func Abs(path string) (string, error) {
 // Rel returns a relative path that is lexically equivalent to targpath when
 // joined to basepath with an intervening separator. That is,
 // Join(basepath, Rel(basepath, targpath)) is equivalent to targpath itself.
+// On success, the returned path will always be relative to basepath,
+// even if basepath and targpath share no elements.
 // An error is returned if targpath can't be made relative to basepath or if
 // knowing the current working directory would be necessary to compute it.
 func Rel(basepath, targpath string) (string, error) {
@@ -423,6 +426,8 @@ func Base(path string) string {
 	for len(path) > 0 && os.IsPathSeparator(path[len(path)-1]) {
 		path = path[0 : len(path)-1]
 	}
+	// Throw away volume name
+	path = path[len(VolumeName(path)):]
 	// Find the last element
 	i := len(path) - 1
 	for i >= 0 && !os.IsPathSeparator(path[i]) {
@@ -437,3 +442,25 @@ func Base(path string) string {
 	}
 	return path
 }
+
+// Dir returns the all but the last element of path, typically the path's directory.
+// Trailing path separators are removed before processing.
+// If the path is empty, Dir returns ".".
+// If the path consists entirely of separators, Dir returns a single separator.
+// The returned path does not end in a separator unless it is the root directory.
+func Dir(path string) string {
+	vol := VolumeName(path)
+	i := len(path) - 1
+	for i >= len(vol) && !os.IsPathSeparator(path[i]) {
+		i--
+	}
+	dir := Clean(path[len(vol) : i+1])
+	last := len(dir) - 1
+	if last > 0 && os.IsPathSeparator(dir[last]) {
+		dir = dir[:last]
+	}
+	if dir == "" {
+		dir = "."
+	}
+	return vol + dir
+}
diff --git a/libgo/go/path/filepath/path_test.go b/libgo/go/path/filepath/path_test.go
index b5b0dedcd40..63adcb88c46 100644
--- a/libgo/go/path/filepath/path_test.go
+++ b/libgo/go/path/filepath/path_test.go
@@ -422,14 +422,77 @@ var basetests = []PathTest{
 	{"a/b/c.x", "c.x"},
 }
 
+var winbasetests = []PathTest{
+	{`c:\`, `\`},
+	{`c:.`, `.`},
+	{`c:\a\b`, `b`},
+	{`c:a\b`, `b`},
+	{`c:a\b\c`, `c`},
+	{`\\host\share\`, `\`},
+	{`\\host\share\a`, `a`},
+	{`\\host\share\a\b`, `b`},
+}
+
 func TestBase(t *testing.T) {
-	for _, test := range basetests {
-		if s := filepath.ToSlash(filepath.Base(test.path)); s != test.result {
+	tests := basetests
+	if runtime.GOOS == "windows" {
+		// make unix tests work on windows
+		for i, _ := range tests {
+			tests[i].result = filepath.Clean(tests[i].result)
+		}
+		// add windows specific tests
+		tests = append(tests, winbasetests...)
+	}
+	for _, test := range tests {
+		if s := filepath.Base(test.path); s != test.result {
 			t.Errorf("Base(%q) = %q, want %q", test.path, s, test.result)
 		}
 	}
 }
 
+var dirtests = []PathTest{
+	{"", "."},
+	{".", "."},
+	{"/.", "/"},
+	{"/", "/"},
+	{"////", "/"},
+	{"/foo", "/"},
+	{"x/", "x"},
+	{"abc", "."},
+	{"abc/def", "abc"},
+	{"a/b/.x", "a/b"},
+	{"a/b/c.", "a/b"},
+	{"a/b/c.x", "a/b"},
+}
+
+var windirtests = []PathTest{
+	{`c:\`, `c:\`},
+	{`c:.`, `c:.`},
+	{`c:\a\b`, `c:\a`},
+	{`c:a\b`, `c:a`},
+	{`c:a\b\c`, `c:a\b`},
+	{`\\host\share\`, `\\host\share\`},
+	{`\\host\share\a`, `\\host\share\`},
+	{`\\host\share\a\b`, `\\host\share\a`},
+}
+
+func TestDir(t *testing.T) {
+	tests := dirtests
+	if runtime.GOOS == "windows" {
+		// make unix tests work on windows
+		for i, _ := range tests {
+			tests[i].result = filepath.Clean(tests[i].result)
+		}
+		// add windows specific tests
+		tests = append(tests, windirtests...)
+	}
+	for _, test := range tests {
+		if s := filepath.Dir(test.path); s != test.result {
+			t.Errorf("Dir(%q) = %q, want %q", test.path, s, test.result)
+		}
+	}
+}
+
 type IsAbsTest struct {
 	path  string
 	isAbs bool
diff --git a/libgo/go/path/filepath/path_unix.go b/libgo/go/path/filepath/path_unix.go
index daf0eb2af7c..c5ac71efe21 100644
--- a/libgo/go/path/filepath/path_unix.go
+++ b/libgo/go/path/filepath/path_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package filepath
 
diff --git a/libgo/go/path/path.go b/libgo/go/path/path.go
index 235384667c6..20d89c9ff0c 100644
--- a/libgo/go/path/path.go
+++ b/libgo/go/path/path.go
@@ -160,3 +160,21 @@ func Base(path string) string {
 func IsAbs(path string) bool {
 	return len(path) > 0 && path[0] == '/'
 }
+
+// Dir returns the all but the last element of path, typically the path's directory.
+// Trailing path separators are removed before processing.
+// If the path is empty, Dir returns ".".
+// If the path consists entirely of separators, Dir returns a single separator.
+// The returned path does not end in a separator unless it is the root directory.
+func Dir(path string) string {
+	dir, _ := Split(path)
+	dir = Clean(dir)
+	last := len(dir) - 1
+	if last > 0 && dir[last] == '/' {
+		dir = dir[:last]
+	}
+	if dir == "" {
+		dir = "."
+	}
+	return dir
+}
diff --git a/libgo/go/path/path_test.go b/libgo/go/path/path_test.go
index 1fd57cc800e..77f080433b6 100644
--- a/libgo/go/path/path_test.go
+++ b/libgo/go/path/path_test.go
@@ -8,11 +8,11 @@ import (
 	"testing"
 )
 
-type CleanTest struct {
-	path, clean string
+type PathTest struct {
+	path, result string
 }
 
-var cleantests = []CleanTest{
+var cleantests = []PathTest{
 	// Already clean
 	{"", "."},
 	{"abc", "abc"},
@@ -64,8 +64,8 @@ var cleantests = []CleanTest{
 
 func TestClean(t *testing.T) {
 	for _, test := range cleantests {
-		if s := Clean(test.path); s != test.clean {
-			t.Errorf("Clean(%q) = %q, want %q", test.path, s, test.clean)
+		if s := Clean(test.path); s != test.result {
+			t.Errorf("Clean(%q) = %q, want %q", test.path, s, test.result)
 		}
 	}
 }
@@ -148,7 +148,7 @@ func TestExt(t *testing.T) {
 	}
 }
 
-var basetests = []CleanTest{
+var basetests = []PathTest{
 	// Already clean
 	{"", "."},
 	{".", "."},
@@ -165,8 +165,31 @@ var basetests = []CleanTest{
 
 func TestBase(t *testing.T) {
 	for _, test := range basetests {
-		if s := Base(test.path); s != test.clean {
-			t.Errorf("Base(%q) = %q, want %q", test.path, s, test.clean)
+		if s := Base(test.path); s != test.result {
+			t.Errorf("Base(%q) = %q, want %q", test.path, s, test.result)
+		}
+	}
+}
+
+var dirtests = []PathTest{
+	{"", "."},
+	{".", "."},
+	{"/.", "/"},
+	{"/", "/"},
+	{"////", "/"},
+	{"/foo", "/"},
+	{"x/", "x"},
+	{"abc", "."},
+	{"abc/def", "abc"},
+	{"a/b/.x", "a/b"},
+	{"a/b/c.", "a/b"},
+	{"a/b/c.x", "a/b"},
+}
+
+func TestDir(t *testing.T) {
+	for _, test := range dirtests {
+		if s := Dir(test.path); s != test.result {
+			t.Errorf("Dir(%q) = %q, want %q", test.path, s, test.result)
 		}
 	}
 }
diff --git a/libgo/go/regexp/all_test.go b/libgo/go/regexp/all_test.go
index 8810796daf2..e729510b513 100644
--- a/libgo/go/regexp/all_test.go
+++ b/libgo/go/regexp/all_test.go
@@ -324,8 +324,7 @@ func BenchmarkLiteral(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatalf("no match!")
 		}
 	}
 }
@@ -337,8 +336,7 @@ func BenchmarkNotLiteral(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatalf("no match!")
 		}
 	}
 }
@@ -350,8 +348,7 @@ func BenchmarkMatchClass(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatalf("no match!")
 		}
 	}
 }
@@ -365,8 +362,7 @@ func BenchmarkMatchClass_InRange(b *testing.B) {
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		if !re.MatchString(x) {
-			println("no match!")
-			break
+			b.Fatalf("no match!")
 		}
 	}
 }
diff --git a/libgo/go/regexp/exec_test.go b/libgo/go/regexp/exec_test.go
index 312bf0275fd..e668574a514 100644
--- a/libgo/go/regexp/exec_test.go
+++ b/libgo/go/regexp/exec_test.go
@@ -673,7 +673,7 @@ func benchmark(b *testing.B, re string, n int) {
 	b.SetBytes(int64(n))
 	for i := 0; i < b.N; i++ {
 		if r.Match(t) {
-			panic("match!")
+			b.Fatal("match!")
 		}
 	}
 }
diff --git a/libgo/go/sort/sort.go b/libgo/go/sort/sort.go
index 83ee170cbab..4aa4ca6d7da 100644
--- a/libgo/go/sort/sort.go
+++ b/libgo/go/sort/sort.go
@@ -240,14 +240,18 @@ func (p StringSlice) Sort() { Sort(p) }
 
 // Ints sorts a slice of ints in increasing order.
 func Ints(a []int) { Sort(IntSlice(a)) }
+
 // Float64s sorts a slice of float64s in increasing order.
 func Float64s(a []float64) { Sort(Float64Slice(a)) }
+
 // Strings sorts a slice of strings in increasing order.
 func Strings(a []string) { Sort(StringSlice(a)) }
 
 // IntsAreSorted tests whether a slice of ints is sorted in increasing order.
 func IntsAreSorted(a []int) bool { return IsSorted(IntSlice(a)) }
+
 // Float64sAreSorted tests whether a slice of float64s is sorted in increasing order.
 func Float64sAreSorted(a []float64) bool { return IsSorted(Float64Slice(a)) }
+
 // StringsAreSorted tests whether a slice of strings is sorted in increasing order.
 func StringsAreSorted(a []string) bool { return IsSorted(StringSlice(a)) }
diff --git a/libgo/go/strconv/atof.go b/libgo/go/strconv/atof.go
index 8bda89088bf..42fc431db8a 100644
--- a/libgo/go/strconv/atof.go
+++ b/libgo/go/strconv/atof.go
@@ -263,6 +263,18 @@ func (d *decimal) atof32int() float32 {
 	return f
 }
 
+// Reads a uint64 decimal mantissa, which might be truncated.
+func (d *decimal) atou64() (mant uint64, digits int) {
+	const uint64digits = 19
+	for i, c := range d.d[:d.nd] {
+		if i == uint64digits {
+			return mant, i
+		}
+		mant = 10*mant + uint64(c-'0')
+	}
+	return mant, d.nd
+}
+
 // Exact powers of 10.
 var float64pow10 = []float64{
 	1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
@@ -375,6 +387,17 @@ func atof64(s string) (f float64, err error) {
 		if f, ok := d.atof64(); ok {
 			return f, nil
 		}
+
+		// Try another fast path.
+		ext := new(extFloat)
+		if ok := ext.AssignDecimal(&d); ok {
+			b, ovf := ext.floatBits()
+			f = math.Float64frombits(b)
+			if ovf {
+				err = rangeError(fnParseFloat, s)
+			}
+			return f, err
+		}
 	}
 	b, ovf := d.floatBits(&float64info)
 	f = math.Float64frombits(b)
diff --git a/libgo/go/strconv/atof_test.go b/libgo/go/strconv/atof_test.go
index 4d5ce1714f4..3fa637d2bc6 100644
--- a/libgo/go/strconv/atof_test.go
+++ b/libgo/go/strconv/atof_test.go
@@ -5,9 +5,12 @@
 package strconv_test
 
 import (
+	"math"
+	"math/rand"
 	"reflect"
 	. "strconv"
 	"testing"
+	"time"
 )
 
 type atofTest struct {
@@ -111,8 +114,22 @@ var atoftests = []atofTest{
 	{"2.2250738585072012e-308", "2.2250738585072014e-308", nil},
 	// http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/
 	{"2.2250738585072011e-308", "2.225073858507201e-308", nil},
+
+	// A very large number (initially wrongly parsed by the fast algorithm).
+	{"4.630813248087435e+307", "4.630813248087435e+307", nil},
 }
 
+type atofSimpleTest struct {
+	x float64
+	s string
+}
+
+var (
+	atofRandomTests        []atofSimpleTest
+	benchmarksRandomBits   [1024]string
+	benchmarksRandomNormal [1024]string
+)
+
 func init() {
 	// The atof routines return NumErrors wrapping
 	// the error and the string.  Convert the table above.
@@ -122,6 +139,31 @@ func init() {
 			test.err = &NumError{"ParseFloat", test.in, test.err}
 		}
 	}
+
+	// Generate random inputs for tests and benchmarks
+	rand.Seed(time.Now().UnixNano())
+	if testing.Short() {
+		atofRandomTests = make([]atofSimpleTest, 100)
+	} else {
+		atofRandomTests = make([]atofSimpleTest, 10000)
+	}
+	for i := range atofRandomTests {
+		n := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())
+		x := math.Float64frombits(n)
+		s := FormatFloat(x, 'g', -1, 64)
+		atofRandomTests[i] = atofSimpleTest{x, s}
+	}
+
+	for i := range benchmarksRandomBits {
+		bits := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())
+		x := math.Float64frombits(bits)
+		benchmarksRandomBits[i] = FormatFloat(x, 'g', -1, 64)
+	}
+
+	for i := range benchmarksRandomNormal {
+		x := rand.NormFloat64()
+		benchmarksRandomNormal[i] = FormatFloat(x, 'g', -1, 64)
+	}
 }
 
 func testAtof(t *testing.T, opt bool) {
@@ -156,6 +198,19 @@ func TestAtof(t *testing.T) { testAtof(t, true) }
 
 func TestAtofSlow(t *testing.T) { testAtof(t, false) }
 
+func TestAtofRandom(t *testing.T) {
+	for _, test := range atofRandomTests {
+		x, _ := ParseFloat(test.s, 64)
+		switch {
+		default:
+			t.Errorf("number %s badly parsed as %b (expected %b)", test.s, x, test.x)
+		case x == test.x:
+		case math.IsNaN(test.x) && math.IsNaN(x):
+		}
+	}
+	t.Logf("tested %d random numbers", len(atofRandomTests))
+}
+
 func BenchmarkAtof64Decimal(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		ParseFloat("33909", 64)
@@ -179,3 +234,15 @@ func BenchmarkAtof64Big(b *testing.B) {
 		ParseFloat("123456789123456789123456789", 64)
 	}
 }
+
+func BenchmarkAtof64RandomBits(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		ParseFloat(benchmarksRandomBits[i%1024], 64)
+	}
+}
+
+func BenchmarkAtof64RandomFloats(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		ParseFloat(benchmarksRandomNormal[i%1024], 64)
+	}
+}
diff --git a/libgo/go/strconv/decimal.go b/libgo/go/strconv/decimal.go
index 541553097bb..cc5591a8d8f 100644
--- a/libgo/go/strconv/decimal.go
+++ b/libgo/go/strconv/decimal.go
@@ -14,9 +14,9 @@ package strconv
 type decimal struct {
 	// TODO(rsc): Can make d[] a bit smaller and add
 	// truncated bool;
-	d   [2000]byte // digits
-	nd  int        // number of digits used
-	dp  int        // decimal point
+	d   [800]byte // digits
+	nd  int       // number of digits used
+	dp  int       // decimal point
 	neg bool
 }
 
diff --git a/libgo/go/strconv/extfloat.go b/libgo/go/strconv/extfloat.go
new file mode 100644
index 00000000000..980052a778b
--- /dev/null
+++ b/libgo/go/strconv/extfloat.go
@@ -0,0 +1,311 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package strconv
+
+import "math"
+
+// An extFloat represents an extended floating-point number, with more
+// precision than a float64. It does not try to save bits: the
+// number represented by the structure is mant*(2^exp), with a negative
+// sign if neg is true.
+type extFloat struct {
+	mant uint64
+	exp  int
+	neg  bool
+}
+
+// Powers of ten taken from double-conversion library.
+// http://code.google.com/p/double-conversion/
+const (
+	firstPowerOfTen = -348
+	stepPowerOfTen  = 8
+)
+
+var smallPowersOfTen = [...]extFloat{
+	{1 << 63, -63, false},        // 1
+	{0xa << 60, -60, false},      // 1e1
+	{0x64 << 57, -57, false},     // 1e2
+	{0x3e8 << 54, -54, false},    // 1e3
+	{0x2710 << 50, -50, false},   // 1e4
+	{0x186a0 << 47, -47, false},  // 1e5
+	{0xf4240 << 44, -44, false},  // 1e6
+	{0x989680 << 40, -40, false}, // 1e7
+}
+
+var powersOfTen = [...]extFloat{
+	{0xfa8fd5a0081c0288, -1220, false}, // 10^-348
+	{0xbaaee17fa23ebf76, -1193, false}, // 10^-340
+	{0x8b16fb203055ac76, -1166, false}, // 10^-332
+	{0xcf42894a5dce35ea, -1140, false}, // 10^-324
+	{0x9a6bb0aa55653b2d, -1113, false}, // 10^-316
+	{0xe61acf033d1a45df, -1087, false}, // 10^-308
+	{0xab70fe17c79ac6ca, -1060, false}, // 10^-300
+	{0xff77b1fcbebcdc4f, -1034, false}, // 10^-292
+	{0xbe5691ef416bd60c, -1007, false}, // 10^-284
+	{0x8dd01fad907ffc3c, -980, false},  // 10^-276
+	{0xd3515c2831559a83, -954, false},  // 10^-268
+	{0x9d71ac8fada6c9b5, -927, false},  // 10^-260
+	{0xea9c227723ee8bcb, -901, false},  // 10^-252
+	{0xaecc49914078536d, -874, false},  // 10^-244
+	{0x823c12795db6ce57, -847, false},  // 10^-236
+	{0xc21094364dfb5637, -821, false},  // 10^-228
+	{0x9096ea6f3848984f, -794, false},  // 10^-220
+	{0xd77485cb25823ac7, -768, false},  // 10^-212
+	{0xa086cfcd97bf97f4, -741, false},  // 10^-204
+	{0xef340a98172aace5, -715, false},  // 10^-196
+	{0xb23867fb2a35b28e, -688, false},  // 10^-188
+	{0x84c8d4dfd2c63f3b, -661, false},  // 10^-180
+	{0xc5dd44271ad3cdba, -635, false},  // 10^-172
+	{0x936b9fcebb25c996, -608, false},  // 10^-164
+	{0xdbac6c247d62a584, -582, false},  // 10^-156
+	{0xa3ab66580d5fdaf6, -555, false},  // 10^-148
+	{0xf3e2f893dec3f126, -529, false},  // 10^-140
+	{0xb5b5ada8aaff80b8, -502, false},  // 10^-132
+	{0x87625f056c7c4a8b, -475, false},  // 10^-124
+	{0xc9bcff6034c13053, -449, false},  // 10^-116
+	{0x964e858c91ba2655, -422, false},  // 10^-108
+	{0xdff9772470297ebd, -396, false},  // 10^-100
+	{0xa6dfbd9fb8e5b88f, -369, false},  // 10^-92
+	{0xf8a95fcf88747d94, -343, false},  // 10^-84
+	{0xb94470938fa89bcf, -316, false},  // 10^-76
+	{0x8a08f0f8bf0f156b, -289, false},  // 10^-68
+	{0xcdb02555653131b6, -263, false},  // 10^-60
+	{0x993fe2c6d07b7fac, -236, false},  // 10^-52
+	{0xe45c10c42a2b3b06, -210, false},  // 10^-44
+	{0xaa242499697392d3, -183, false},  // 10^-36
+	{0xfd87b5f28300ca0e, -157, false},  // 10^-28
+	{0xbce5086492111aeb, -130, false},  // 10^-20
+	{0x8cbccc096f5088cc, -103, false},  // 10^-12
+	{0xd1b71758e219652c, -77, false},   // 10^-4
+	{0x9c40000000000000, -50, false},   // 10^4
+	{0xe8d4a51000000000, -24, false},   // 10^12
+	{0xad78ebc5ac620000, 3, false},     // 10^20
+	{0x813f3978f8940984, 30, false},    // 10^28
+	{0xc097ce7bc90715b3, 56, false},    // 10^36
+	{0x8f7e32ce7bea5c70, 83, false},    // 10^44
+	{0xd5d238a4abe98068, 109, false},   // 10^52
+	{0x9f4f2726179a2245, 136, false},   // 10^60
+	{0xed63a231d4c4fb27, 162, false},   // 10^68
+	{0xb0de65388cc8ada8, 189, false},   // 10^76
+	{0x83c7088e1aab65db, 216, false},   // 10^84
+	{0xc45d1df942711d9a, 242, false},   // 10^92
+	{0x924d692ca61be758, 269, false},   // 10^100
+	{0xda01ee641a708dea, 295, false},   // 10^108
+	{0xa26da3999aef774a, 322, false},   // 10^116
+	{0xf209787bb47d6b85, 348, false},   // 10^124
+	{0xb454e4a179dd1877, 375, false},   // 10^132
+	{0x865b86925b9bc5c2, 402, false},   // 10^140
+	{0xc83553c5c8965d3d, 428, false},   // 10^148
+	{0x952ab45cfa97a0b3, 455, false},   // 10^156
+	{0xde469fbd99a05fe3, 481, false},   // 10^164
+	{0xa59bc234db398c25, 508, false},   // 10^172
+	{0xf6c69a72a3989f5c, 534, false},   // 10^180
+	{0xb7dcbf5354e9bece, 561, false},   // 10^188
+	{0x88fcf317f22241e2, 588, false},   // 10^196
+	{0xcc20ce9bd35c78a5, 614, false},   // 10^204
+	{0x98165af37b2153df, 641, false},   // 10^212
+	{0xe2a0b5dc971f303a, 667, false},   // 10^220
+	{0xa8d9d1535ce3b396, 694, false},   // 10^228
+	{0xfb9b7cd9a4a7443c, 720, false},   // 10^236
+	{0xbb764c4ca7a44410, 747, false},   // 10^244
+	{0x8bab8eefb6409c1a, 774, false},   // 10^252
+	{0xd01fef10a657842c, 800, false},   // 10^260
+	{0x9b10a4e5e9913129, 827, false},   // 10^268
+	{0xe7109bfba19c0c9d, 853, false},   // 10^276
+	{0xac2820d9623bf429, 880, false},   // 10^284
+	{0x80444b5e7aa7cf85, 907, false},   // 10^292
+	{0xbf21e44003acdd2d, 933, false},   // 10^300
+	{0x8e679c2f5e44ff8f, 960, false},   // 10^308
+	{0xd433179d9c8cb841, 986, false},   // 10^316
+	{0x9e19db92b4e31ba9, 1013, false},  // 10^324
+	{0xeb96bf6ebadf77d9, 1039, false},  // 10^332
+	{0xaf87023b9bf0ee6b, 1066, false},  // 10^340
+}
+
+// floatBits returns the bits of the float64 that best approximates
+// the extFloat passed as receiver. Overflow is set to true if
+// the resulting float64 is ±Inf.
+func (f *extFloat) floatBits() (bits uint64, overflow bool) {
+	flt := &float64info
+	f.Normalize()
+
+	exp := f.exp + 63
+
+	// Exponent too small.
+	if exp < flt.bias+1 {
+		n := flt.bias + 1 - exp
+		f.mant >>= uint(n)
+		exp += n
+	}
+
+	// Extract 1+flt.mantbits bits.
+	mant := f.mant >> (63 - flt.mantbits)
+	if f.mant&(1<<(62-flt.mantbits)) != 0 {
+		// Round up.
+		mant += 1
+	}
+
+	// Rounding might have added a bit; shift down.
+	if mant == 2<<flt.mantbits {
+		mant >>= 1
+		exp++
+	}
+
+	// Infinities.
+	if exp-flt.bias >= 1<<flt.expbits-1 {
+		goto overflow
+	}
+
+	// Denormalized?
+	if mant&(1<<flt.mantbits) == 0 {
+		exp = flt.bias
+	}
+	goto out
+
+overflow:
+	// ±Inf
+	mant = 0
+	exp = 1<<flt.expbits - 1 + flt.bias
+	overflow = true
+
+out:
+	// Assemble bits.
+	bits = mant & (uint64(1)<<flt.mantbits - 1)
+	bits |= uint64((exp-flt.bias)&(1<<flt.expbits-1)) << flt.mantbits
+	if f.neg {
+		bits |= 1 << (flt.mantbits + flt.expbits)
+	}
+	return
+}
+
+// Assign sets f to the value of x.
+func (f *extFloat) Assign(x float64) {
+	if x < 0 {
+		x = -x
+		f.neg = true
+	}
+	x, f.exp = math.Frexp(x)
+	f.mant = uint64(x * float64(1<<64))
+	f.exp -= 64
+}
+
+// Normalize normalizes f so that the highest bit of the mantissa is
+// set, and returns the number by which the mantissa was left-shifted.
+func (f *extFloat) Normalize() uint {
+	if f.mant == 0 {
+		return 0
+	}
+	exp_before := f.exp
+	for f.mant < (1 << 55) {
+		f.mant <<= 8
+		f.exp -= 8
+	}
+	for f.mant < (1 << 63) {
+		f.mant <<= 1
+		f.exp -= 1
+	}
+	return uint(exp_before - f.exp)
+}
+
+// Multiply sets f to the product f*g: the result is correctly rounded,
+// but not normalized.
+func (f *extFloat) Multiply(g extFloat) {
+	fhi, flo := f.mant>>32, uint64(uint32(f.mant))
+	ghi, glo := g.mant>>32, uint64(uint32(g.mant))
+
+	// Cross products.
+	cross1 := fhi * glo
+	cross2 := flo * ghi
+
+	// f.mant*g.mant is fhi*ghi << 64 + (cross1+cross2) << 32 + flo*glo
+	f.mant = fhi*ghi + (cross1 >> 32) + (cross2 >> 32)
+	rem := uint64(uint32(cross1)) + uint64(uint32(cross2)) + ((flo * glo) >> 32)
+	// Round up.
+	rem += (1 << 31)
+
+	f.mant += (rem >> 32)
+	f.exp = f.exp + g.exp + 64
+}
+
+var uint64pow10 = [...]uint64{
+	1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
+	1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
+}
+
+// AssignDecimal sets f to an approximate value of the decimal d. It
+// returns true if the value represented by f is guaranteed to be the
+// best approximation of d after being rounded to a float64. 
+func (f *extFloat) AssignDecimal(d *decimal) (ok bool) {
+	const uint64digits = 19
+	const errorscale = 8
+	mant10, digits := d.atou64()
+	exp10 := d.dp - digits
+	errors := 0 // An upper bound for error, computed in errorscale*ulp.
+
+	if digits < d.nd {
+		// the decimal number was truncated.
+		errors += errorscale / 2
+	}
+
+	f.mant = mant10
+	f.exp = 0
+	f.neg = d.neg
+
+	// Multiply by powers of ten.
+	i := (exp10 - firstPowerOfTen) / stepPowerOfTen
+	if exp10 < firstPowerOfTen || i >= len(powersOfTen) {
+		return false
+	}
+	adjExp := (exp10 - firstPowerOfTen) % stepPowerOfTen
+
+	// We multiply by exp%step
+	if digits+adjExp <= uint64digits {
+		// We can multiply the mantissa
+		f.mant *= uint64(float64pow10[adjExp])
+		f.Normalize()
+	} else {
+		f.Normalize()
+		f.Multiply(smallPowersOfTen[adjExp])
+		errors += errorscale / 2
+	}
+
+	// We multiply by 10 to the exp - exp%step.
+	f.Multiply(powersOfTen[i])
+	if errors > 0 {
+		errors += 1
+	}
+	errors += errorscale / 2
+
+	// Normalize
+	shift := f.Normalize()
+	errors <<= shift
+
+	// Now f is a good approximation of the decimal.
+	// Check whether the error is too large: that is, if the mantissa
+	// is perturbated by the error, the resulting float64 will change.
+	// The 64 bits mantissa is 1 + 52 bits for float64 + 11 extra bits.
+	//
+	// In many cases the approximation will be good enough.
+	const denormalExp = -1023 - 63
+	flt := &float64info
+	var extrabits uint
+	if f.exp <= denormalExp {
+		extrabits = uint(63 - flt.mantbits + 1 + uint(denormalExp-f.exp))
+	} else {
+		extrabits = uint(63 - flt.mantbits)
+	}
+
+	halfway := uint64(1) << (extrabits - 1)
+	mant_extra := f.mant & (1<<extrabits - 1)
+
+	// Do a signed comparison here! If the error estimate could make
+	// the mantissa round differently for the conversion to double,
+	// then we can't give a definite answer.
+	if int64(halfway)-int64(errors) < int64(mant_extra) &&
+		int64(mant_extra) < int64(halfway)+int64(errors) {
+		return false
+	}
+	return true
+}
diff --git a/libgo/go/strconv/ftoa.go b/libgo/go/strconv/ftoa.go
index 692e3e40875..f4434fd5175 100644
--- a/libgo/go/strconv/ftoa.go
+++ b/libgo/go/strconv/ftoa.go
@@ -40,11 +40,7 @@ var float64info = floatInfo{52, 11, -1023}
 // For 'e', 'E', and 'f' it is the number of digits after the decimal point.
 // For 'g' and 'G' it is the total number of digits.
 // The special precision -1 uses the smallest number of digits
-// necessary such that Atof32 will return f exactly.
-//
-// Ftoa32(f) is not the same as Ftoa64(float32(f)),
-// because correct rounding and the number of digits
-// needed to identify f depend on the precision of the representation.
+// necessary such that ParseFloat will return f exactly.
 func FormatFloat(f float64, fmt byte, prec, bitSize int) string {
 	return string(genericFtoa(make([]byte, 0, max(prec+4, 24)), f, fmt, prec, bitSize))
 }
diff --git a/libgo/go/strings/strings_test.go b/libgo/go/strings/strings_test.go
index 8866d220c00..54046d68aa0 100644
--- a/libgo/go/strings/strings_test.go
+++ b/libgo/go/strings/strings_test.go
@@ -8,7 +8,6 @@ import (
 	"bytes"
 	"io"
 	"reflect"
-	"strconv"
 	. "strings"
 	"testing"
 	"unicode"
@@ -143,7 +142,7 @@ const benchmarkString = "some_text=some☺value"
 
 func BenchmarkIndexRune(b *testing.B) {
 	if got := IndexRune(benchmarkString, '☺'); got != 14 {
-		panic("wrong index: got=" + strconv.Itoa(got))
+		b.Fatalf("wrong index: expected 14, got=%d", got)
 	}
 	for i := 0; i < b.N; i++ {
 		IndexRune(benchmarkString, '☺')
@@ -152,7 +151,7 @@ func BenchmarkIndexRune(b *testing.B) {
 
 func BenchmarkIndexRuneFastPath(b *testing.B) {
 	if got := IndexRune(benchmarkString, 'v'); got != 17 {
-		panic("wrong index: got=" + strconv.Itoa(got))
+		b.Fatalf("wrong index: expected 17, got=%d", got)
 	}
 	for i := 0; i < b.N; i++ {
 		IndexRune(benchmarkString, 'v')
@@ -161,7 +160,7 @@ func BenchmarkIndexRuneFastPath(b *testing.B) {
 
 func BenchmarkIndex(b *testing.B) {
 	if got := Index(benchmarkString, "v"); got != 17 {
-		panic("wrong index: got=" + strconv.Itoa(got))
+		b.Fatalf("wrong index: expected 17, got=%d", got)
 	}
 	for i := 0; i < b.N; i++ {
 		Index(benchmarkString, "v")
diff --git a/libgo/go/syscall/bpf_bsd.go b/libgo/go/syscall/bpf_bsd.go
index f94b7233b67..f98036c42cd 100644
--- a/libgo/go/syscall/bpf_bsd.go
+++ b/libgo/go/syscall/bpf_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 // Berkeley packet filter for BSD variants
 
diff --git a/libgo/go/syscall/env_unix.go b/libgo/go/syscall/env_unix.go
index df259097c6a..3ba0fb1b098 100644
--- a/libgo/go/syscall/env_unix.go
+++ b/libgo/go/syscall/env_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Unix environment variables.
 
diff --git a/libgo/go/syscall/exec_unix.go b/libgo/go/syscall/exec_unix.go
index c9814b7050e..0cd37c4a0b5 100644
--- a/libgo/go/syscall/exec_unix.go
+++ b/libgo/go/syscall/exec_unix.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build darwin freebsd linux netbsd openbsd
+
 // Fork, exec, wait, etc.
 
 package syscall
diff --git a/libgo/go/syscall/route_bsd.go b/libgo/go/syscall/route_bsd.go
index bc4c15e950b..e17d976b154 100644
--- a/libgo/go/syscall/route_bsd.go
+++ b/libgo/go/syscall/route_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 // Routing sockets and messages
 
@@ -85,8 +85,8 @@ func (m *RouteMessage) sockaddr() []Sockaddr {
 		rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
 		switch i {
 		case RTAX_DST, RTAX_GATEWAY:
-			sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
-			if e != nil {
+			sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
+			if err != nil {
 				return nil
 			}
 			if i == RTAX_DST {
@@ -128,8 +128,8 @@ func (m *InterfaceMessage) sockaddr() (sas []Sockaddr) {
 	if m.Header.Addrs&RTA_IFP == 0 {
 		return nil
 	}
-	sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(&m.Data[0])))
-	if e != nil {
+	sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(&m.Data[0])))
+	if err != nil {
 		return nil
 	}
 	return append(sas, sa)
@@ -157,12 +157,21 @@ func (m *InterfaceAddrMessage) sockaddr() (sas []Sockaddr) {
 		rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
 		switch i {
 		case RTAX_IFA:
-			sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
-			if e != nil {
+			sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
+			if err != nil {
 				return nil
 			}
 			sas = append(sas, sa)
-		case RTAX_NETMASK, RTAX_BRD:
+		case RTAX_NETMASK:
+			if rsa.Family == AF_UNSPEC {
+				rsa.Family = AF_INET // an old fasion, AF_UNSPEC means AF_INET
+			}
+			sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
+			if err != nil {
+				return nil
+			}
+			sas = append(sas, sa)
+		case RTAX_BRD:
 			// nothing to do
 		}
 		buf = buf[rsaAlignOf(int(rsa.Len)):]
diff --git a/libgo/go/syscall/route_netbsd.go b/libgo/go/syscall/route_netbsd.go
new file mode 100644
index 00000000000..d6d9031bcbf
--- /dev/null
+++ b/libgo/go/syscall/route_netbsd.go
@@ -0,0 +1,35 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Routing sockets and messages for NetBSD
+
+package syscall
+
+import (
+	"unsafe"
+)
+
+func (any *anyMessage) toRoutingMessage(buf []byte) RoutingMessage {
+	switch any.Type {
+	case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
+		p := (*RouteMessage)(unsafe.Pointer(any))
+		rtm := &RouteMessage{}
+		rtm.Header = p.Header
+		rtm.Data = buf[SizeofRtMsghdr:any.Msglen]
+		return rtm
+	case RTM_IFINFO:
+		p := (*InterfaceMessage)(unsafe.Pointer(any))
+		ifm := &InterfaceMessage{}
+		ifm.Header = p.Header
+		ifm.Data = buf[SizeofIfMsghdr:any.Msglen]
+		return ifm
+	case RTM_NEWADDR, RTM_DELADDR:
+		p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
+		ifam := &InterfaceAddrMessage{}
+		ifam.Header = p.Header
+		ifam.Data = buf[SizeofIfaMsghdr:any.Msglen]
+		return ifam
+	}
+	return nil
+}
diff --git a/libgo/go/syscall/sockcmsg_unix.go b/libgo/go/syscall/sockcmsg_unix.go
index 84c1383d7e2..d279decb65a 100644
--- a/libgo/go/syscall/sockcmsg_unix.go
+++ b/libgo/go/syscall/sockcmsg_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Socket control messages
 
diff --git a/libgo/go/syscall/socket_linux.go b/libgo/go/syscall/socket_linux.go
index 212e0b2d418..42ab2185084 100644
--- a/libgo/go/syscall/socket_linux.go
+++ b/libgo/go/syscall/socket_linux.go
@@ -167,6 +167,9 @@ func anyToSockaddrOS(rsa *RawSockaddrAny) (Sockaddr, error) {
 //sysnb	EpollCreate(size int) (fd int, err error)
 //epoll_create(size int) int
 
+//sysnb EpollCreate1(flags int) (fd int, err error)
+//epoll_create1(flags int) int
+
 //sysnb	EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
 //epoll_ctl(epfd int, op int, fd int, event *EpollEvent) int
 
diff --git a/libgo/go/syscall/syscall_unix.go b/libgo/go/syscall/syscall_unix.go
index 07d3af3a622..ba109f63ac1 100644
--- a/libgo/go/syscall/syscall_unix.go
+++ b/libgo/go/syscall/syscall_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package syscall
 
diff --git a/libgo/go/testing/benchmark.go b/libgo/go/testing/benchmark.go
index e81e5c5845c..4ce637082ca 100644
--- a/libgo/go/testing/benchmark.go
+++ b/libgo/go/testing/benchmark.go
@@ -25,12 +25,12 @@ type InternalBenchmark struct {
 // B is a type passed to Benchmark functions to manage benchmark
 // timing and to specify the number of iterations to run.
 type B struct {
+	common
 	N         int
 	benchmark InternalBenchmark
-	ns        time.Duration
 	bytes     int64
-	start     time.Time
 	timerOn   bool
+	result    BenchmarkResult
 }
 
 // StartTimer starts timing a test.  This function is called automatically
@@ -48,7 +48,7 @@ func (b *B) StartTimer() {
 // want to measure.
 func (b *B) StopTimer() {
 	if b.timerOn {
-		b.ns += time.Now().Sub(b.start)
+		b.duration += time.Now().Sub(b.start)
 		b.timerOn = false
 	}
 }
@@ -59,7 +59,7 @@ func (b *B) ResetTimer() {
 	if b.timerOn {
 		b.start = time.Now()
 	}
-	b.ns = 0
+	b.duration = 0
 }
 
 // SetBytes records the number of bytes processed in a single operation.
@@ -70,7 +70,7 @@ func (b *B) nsPerOp() int64 {
 	if b.N <= 0 {
 		return 0
 	}
-	return b.ns.Nanoseconds() / int64(b.N)
+	return b.duration.Nanoseconds() / int64(b.N)
 }
 
 // runN runs a single benchmark for the specified number of iterations.
@@ -127,17 +127,25 @@ func roundUp(n int) int {
 	return 10 * base
 }
 
-// run times the benchmark function.  It gradually increases the number
+// run times the benchmark function in a separate goroutine.
+func (b *B) run() BenchmarkResult {
+	go b.launch()
+	<-b.signal
+	return b.result
+}
+
+// launch launches the benchmark function.  It gradually increases the number
 // of benchmark iterations until the benchmark runs for a second in order
 // to get a reasonable measurement.  It prints timing information in this form
 //		testing.BenchmarkHello	100000		19 ns/op
-func (b *B) run() BenchmarkResult {
+// launch is run by the fun function as a separate goroutine.
+func (b *B) launch() {
 	// Run the benchmark for a single iteration in case it's expensive.
 	n := 1
 	b.runN(n)
 	// Run the benchmark for at least the specified amount of time.
 	d := time.Duration(*benchTime * float64(time.Second))
-	for b.ns < d && n < 1e9 {
+	for !b.failed && b.duration < d && n < 1e9 {
 		last := n
 		// Predict iterations/sec.
 		if b.nsPerOp() == 0 {
@@ -153,7 +161,8 @@ func (b *B) run() BenchmarkResult {
 		n = roundUp(n)
 		b.runN(n)
 	}
-	return BenchmarkResult{b.N, b.ns, b.bytes}
+	b.result = BenchmarkResult{b.N, b.duration, b.bytes}
+	b.signal <- b
 }
 
 // The results of a benchmark run.
@@ -215,14 +224,32 @@ func RunBenchmarks(matchString func(pat, str string) (bool, error), benchmarks [
 		}
 		for _, procs := range cpuList {
 			runtime.GOMAXPROCS(procs)
-			b := &B{benchmark: Benchmark}
+			b := &B{
+				common: common{
+					signal: make(chan interface{}),
+				},
+				benchmark: Benchmark,
+			}
 			benchName := Benchmark.Name
 			if procs != 1 {
 				benchName = fmt.Sprintf("%s-%d", Benchmark.Name, procs)
 			}
 			fmt.Printf("%s\t", benchName)
 			r := b.run()
+			if b.failed {
+				// The output could be very long here, but probably isn't.
+				// We print it all, regardless, because we don't want to trim the reason
+				// the benchmark failed.
+				fmt.Printf("--- FAIL: %s\n%s", benchName, b.output)
+				continue
+			}
 			fmt.Printf("%v\n", r)
+			// Unlike with tests, we ignore the -chatty flag and always print output for
+			// benchmarks since the output generation time will skew the results.
+			if len(b.output) > 0 {
+				b.trimOutput()
+				fmt.Printf("--- BENCH: %s\n%s", benchName, b.output)
+			}
 			if p := runtime.GOMAXPROCS(-1); p != procs {
 				fmt.Fprintf(os.Stderr, "testing: %s left GOMAXPROCS set to %d\n", benchName, p)
 			}
@@ -230,9 +257,31 @@ func RunBenchmarks(matchString func(pat, str string) (bool, error), benchmarks [
 	}
 }
 
+// trimOutput shortens the output from a benchmark, which can be very long.
+func (b *B) trimOutput() {
+	// The output is likely to appear multiple times because the benchmark
+	// is run multiple times, but at least it will be seen. This is not a big deal
+	// because benchmarks rarely print, but just in case, we trim it if it's too long.
+	const maxNewlines = 10
+	for nlCount, j := 0, 0; j < len(b.output); j++ {
+		if b.output[j] == '\n' {
+			nlCount++
+			if nlCount >= maxNewlines {
+				b.output = append(b.output[:j], "\n\t... [output truncated]\n"...)
+				break
+			}
+		}
+	}
+}
+
 // Benchmark benchmarks a single function. Useful for creating
 // custom benchmarks that do not use gotest.
 func Benchmark(f func(b *B)) BenchmarkResult {
-	b := &B{benchmark: InternalBenchmark{"", f}}
+	b := &B{
+		common: common{
+			signal: make(chan interface{}),
+		},
+		benchmark: InternalBenchmark{"", f},
+	}
 	return b.run()
 }
diff --git a/libgo/go/testing/example.go b/libgo/go/testing/example.go
index e23f13b6f16..fdeda137e76 100644
--- a/libgo/go/testing/example.go
+++ b/libgo/go/testing/example.go
@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"
 	"time"
 )
 
@@ -67,11 +68,9 @@ func RunExamples(examples []InternalExample) (ok bool) {
 
 		// report any errors
 		tstr := fmt.Sprintf("(%.2f seconds)", dt.Seconds())
-		if out != eg.Output {
-			fmt.Printf(
-				"--- FAIL: %s %s\ngot:\n%s\nwant:\n%s\n",
-				eg.Name, tstr, out, eg.Output,
-			)
+		if g, e := strings.TrimSpace(out), strings.TrimSpace(eg.Output); g != e {
+			fmt.Printf("--- FAIL: %s %s\ngot:\n%s\nwant:\n%s\n",
+				eg.Name, tstr, g, e)
 			ok = false
 		} else if *chatty {
 			fmt.Printf("--- PASS: %s %s\n", eg.Name, tstr)
diff --git a/libgo/go/testing/testing.go b/libgo/go/testing/testing.go
index ca2fced3fb9..16890e0b3fa 100644
--- a/libgo/go/testing/testing.go
+++ b/libgo/go/testing/testing.go
@@ -23,8 +23,8 @@
 //     }
 // The benchmark package will vary b.N until the benchmark function lasts
 // long enough to be timed reliably.  The output
-//     testing.BenchmarkHello	500000	      4076 ns/op
-// means that the loop ran 500000 times at a speed of 4076 ns per loop.
+//     testing.BenchmarkHello    10000000    282 ns/op
+// means that the loop ran 10000000 times at a speed of 282 ns per loop.
 //
 // If a benchmark needs some expensive setup before running, the timer
 // may be stopped:
@@ -70,6 +70,17 @@ var (
 	cpuList []int
 )
 
+// common holds the elements common between T and B and
+// captures common methods such as Errorf.
+type common struct {
+	output   []byte    // Output generated by test or benchmark.
+	failed   bool      // Test or benchmark has failed.
+	start    time.Time // Time test or benchmark started
+	duration time.Duration
+	self     interface{}      // To be sent on signal channel when done.
+	signal   chan interface{} // Output for serial tests.
+}
+
 // Short reports whether the -test.short flag is set.
 func Short() bool {
 	return *short
@@ -79,7 +90,7 @@ func Short() bool {
 // If addFileLine is true, it also prefixes the string with the file and line of the call site.
 func decorate(s string, addFileLine bool) string {
 	if addFileLine {
-		_, file, line, ok := runtime.Caller(3) // decorate + log + public function.
+		_, file, line, ok := runtime.Caller(4) // decorate + log + public function.
 		if ok {
 			// Truncate file name at last file name separator.
 			if index := strings.LastIndex(file, "/"); index >= 0 {
@@ -111,70 +122,68 @@ func decorate(s string, addFileLine bool) string {
 // T is a type passed to Test functions to manage test state and support formatted test logs.
 // Logs are accumulated during execution and dumped to standard error when done.
 type T struct {
-	name          string        // Name of test.
-	errors        string        // Error string from test.
-	failed        bool          // Test has failed.
-	ch            chan *T       // Output for serial tests.
-	startParallel chan bool     // Parallel tests will wait on this.
-	start         time.Time     // Time test started
-	dt            time.Duration // Length of test
+	common
+	name          string    // Name of test.
+	startParallel chan bool // Parallel tests will wait on this.
 }
 
-// Fail marks the Test function as having failed but continues execution.
-func (t *T) Fail() { t.failed = true }
+// Fail marks the function as having failed but continues execution.
+func (c *common) Fail() { c.failed = true }
 
-// Failed returns whether the Test function has failed.
-func (t *T) Failed() bool { return t.failed }
+// Failed returns whether the function has failed.
+func (c *common) Failed() bool { return c.failed }
 
-// FailNow marks the Test function as having failed and stops its execution.
+// FailNow marks the function as having failed and stops its execution.
 // Execution will continue at the next Test.
-func (t *T) FailNow() {
-	t.dt = time.Now().Sub(t.start)
-	t.Fail()
-	t.ch <- t
+func (c *common) FailNow() {
+	c.duration = time.Now().Sub(c.start)
+	c.Fail()
+	c.signal <- c.self
 	runtime.Goexit()
 }
 
 // log generates the output. It's always at the same stack depth.
-func (t *T) log(s string) { t.errors += decorate(s, true) }
+func (c *common) log(s string) {
+	c.output = append(c.output, decorate(s, true)...)
+}
 
-// Log formats its arguments using default formatting, analogous to Print(),
+// Log formats its arguments using default formatting, analogous to Println(),
 // and records the text in the error log.
-func (t *T) Log(args ...interface{}) { t.log(fmt.Sprintln(args...)) }
+func (c *common) Log(args ...interface{}) { c.log(fmt.Sprintln(args...)) }
 
 // Logf formats its arguments according to the format, analogous to Printf(),
 // and records the text in the error log.
-func (t *T) Logf(format string, args ...interface{}) { t.log(fmt.Sprintf(format, args...)) }
+func (c *common) Logf(format string, args ...interface{}) { c.log(fmt.Sprintf(format, args...)) }
 
 // Error is equivalent to Log() followed by Fail().
-func (t *T) Error(args ...interface{}) {
-	t.log(fmt.Sprintln(args...))
-	t.Fail()
+func (c *common) Error(args ...interface{}) {
+	c.log(fmt.Sprintln(args...))
+	c.Fail()
 }
 
 // Errorf is equivalent to Logf() followed by Fail().
-func (t *T) Errorf(format string, args ...interface{}) {
-	t.log(fmt.Sprintf(format, args...))
-	t.Fail()
+func (c *common) Errorf(format string, args ...interface{}) {
+	c.log(fmt.Sprintf(format, args...))
+	c.Fail()
 }
 
 // Fatal is equivalent to Log() followed by FailNow().
-func (t *T) Fatal(args ...interface{}) {
-	t.log(fmt.Sprintln(args...))
-	t.FailNow()
+func (c *common) Fatal(args ...interface{}) {
+	c.log(fmt.Sprintln(args...))
+	c.FailNow()
 }
 
 // Fatalf is equivalent to Logf() followed by FailNow().
-func (t *T) Fatalf(format string, args ...interface{}) {
-	t.log(fmt.Sprintf(format, args...))
-	t.FailNow()
+func (c *common) Fatalf(format string, args ...interface{}) {
+	c.log(fmt.Sprintf(format, args...))
+	c.FailNow()
 }
 
 // Parallel signals that this test is to be run in parallel with (and only with) 
 // other parallel tests in this CPU group.
 func (t *T) Parallel() {
-	t.ch <- nil       // Release main testing loop
-	<-t.startParallel // Wait for serial tests to finish
+	t.signal <- (*T)(nil) // Release main testing loop
+	<-t.startParallel     // Wait for serial tests to finish
 }
 
 // An internal type but exported because it is cross-package; part of the implementation
@@ -187,8 +196,8 @@ type InternalTest struct {
 func tRunner(t *T, test *InternalTest) {
 	t.start = time.Now()
 	test.F(t)
-	t.dt = time.Now().Sub(t.start)
-	t.ch <- t
+	t.duration = time.Now().Sub(t.start)
+	t.signal <- t
 }
 
 // An internal function but exported because it is cross-package; part of the implementation
@@ -211,13 +220,13 @@ func Main(matchString func(pat, str string) (bool, error), tests []InternalTest,
 	after()
 }
 
-func report(t *T) {
-	tstr := fmt.Sprintf("(%.2f seconds)", t.dt.Seconds())
+func (t *T) report() {
+	tstr := fmt.Sprintf("(%.2f seconds)", t.duration.Seconds())
 	format := "--- %s: %s %s\n%s"
 	if t.failed {
-		fmt.Printf(format, "FAIL", t.name, tstr, t.errors)
+		fmt.Printf(format, "FAIL", t.name, tstr, t.output)
 	} else if *chatty {
-		fmt.Printf(format, "PASS", t.name, tstr, t.errors)
+		fmt.Printf(format, "PASS", t.name, tstr, t.output)
 	}
 }
 
@@ -227,9 +236,14 @@ func RunTests(matchString func(pat, str string) (bool, error), tests []InternalT
 		fmt.Fprintln(os.Stderr, "testing: warning: no tests to run")
 		return
 	}
-	ch := make(chan *T)
 	for _, procs := range cpuList {
 		runtime.GOMAXPROCS(procs)
+		// We build a new channel tree for each run of the loop.
+		// collector merges in one channel all the upstream signals from parallel tests.
+		// If all tests pump to the same channel, a bug can occur where a test
+		// kicks off a goroutine that Fails, yet the test still delivers a completion signal,
+		// which skews the counting.
+		var collector = make(chan interface{})
 
 		numParallel := 0
 		startParallel := make(chan bool)
@@ -247,17 +261,27 @@ func RunTests(matchString func(pat, str string) (bool, error), tests []InternalT
 			if procs != 1 {
 				testName = fmt.Sprintf("%s-%d", tests[i].Name, procs)
 			}
-			t := &T{ch: ch, name: testName, startParallel: startParallel}
+			t := &T{
+				common: common{
+					signal: make(chan interface{}),
+				},
+				name:          testName,
+				startParallel: startParallel,
+			}
+			t.self = t
 			if *chatty {
 				fmt.Printf("=== RUN %s\n", t.name)
 			}
 			go tRunner(t, &tests[i])
-			out := <-t.ch
+			out := (<-t.signal).(*T)
 			if out == nil { // Parallel run.
+				go func() {
+					collector <- <-t.signal
+				}()
 				numParallel++
 				continue
 			}
-			report(t)
+			t.report()
 			ok = ok && !out.failed
 		}
 
@@ -269,8 +293,8 @@ func RunTests(matchString func(pat, str string) (bool, error), tests []InternalT
 				numParallel--
 				continue
 			}
-			t := <-ch
-			report(t)
+			t := (<-collector).(*T)
+			t.report()
 			ok = ok && !t.failed
 			running--
 		}
diff --git a/libgo/go/testing/wrapper.go b/libgo/go/testing/wrapper.go
new file mode 100644
index 00000000000..2bef9df9c6f
--- /dev/null
+++ b/libgo/go/testing/wrapper.go
@@ -0,0 +1,105 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file contains wrappers so t.Errorf etc. have documentation.
+// TODO: delete when godoc shows exported methods for unexported embedded fields.
+// TODO: need to change the argument to runtime.Caller in testing.go from 4 to 3 at that point.
+
+package testing
+
+// Fail marks the function as having failed but continues execution.
+func (b *B) Fail() {
+	b.common.Fail()
+}
+
+// Failed returns whether the function has failed.
+func (b *B) Failed() bool {
+	return b.common.Failed()
+}
+
+// FailNow marks the function as having failed and stops its execution.
+// Execution will continue at the next Test.
+func (b *B) FailNow() {
+	b.common.FailNow()
+}
+
+// Log formats its arguments using default formatting, analogous to Println(),
+// and records the text in the error log.
+func (b *B) Log(args ...interface{}) {
+	b.common.Log(args...)
+}
+
+// Logf formats its arguments according to the format, analogous to Printf(),
+// and records the text in the error log.
+func (b *B) Logf(format string, args ...interface{}) {
+	b.common.Logf(format, args...)
+}
+
+// Error is equivalent to Log() followed by Fail().
+func (b *B) Error(args ...interface{}) {
+	b.common.Error(args...)
+}
+
+// Errorf is equivalent to Logf() followed by Fail().
+func (b *B) Errorf(format string, args ...interface{}) {
+	b.common.Errorf(format, args...)
+}
+
+// Fatal is equivalent to Log() followed by FailNow().
+func (b *B) Fatal(args ...interface{}) {
+	b.common.Fatal(args...)
+}
+
+// Fatalf is equivalent to Logf() followed by FailNow().
+func (b *B) Fatalf(format string, args ...interface{}) {
+	b.common.Fatalf(format, args...)
+}
+
+// Fail marks the function as having failed but continues execution.
+func (t *T) Fail() {
+	t.common.Fail()
+}
+
+// Failed returns whether the function has failed.
+func (t *T) Failed() bool {
+	return t.common.Failed()
+}
+
+// FailNow marks the function as having failed and stops its execution.
+// Execution will continue at the next Test.
+func (t *T) FailNow() {
+	t.common.FailNow()
+}
+
+// Log formats its arguments using default formatting, analogous to Println(),
+// and records the text in the error log.
+func (t *T) Log(args ...interface{}) {
+	t.common.Log(args...)
+}
+
+// Logf formats its arguments according to the format, analogous to Printf(),
+// and records the text in the error log.
+func (t *T) Logf(format string, args ...interface{}) {
+	t.common.Logf(format, args...)
+}
+
+// Error is equivalent to Log() followed by Fail().
+func (t *T) Error(args ...interface{}) {
+	t.common.Error(args...)
+}
+
+// Errorf is equivalent to Logf() followed by Fail().
+func (t *T) Errorf(format string, args ...interface{}) {
+	t.common.Errorf(format, args...)
+}
+
+// Fatal is equivalent to Log() followed by FailNow().
+func (t *T) Fatal(args ...interface{}) {
+	t.common.Fatal(args...)
+}
+
+// Fatalf is equivalent to Logf() followed by FailNow().
+func (t *T) Fatalf(format string, args ...interface{}) {
+	t.common.Fatalf(format, args...)
+}
diff --git a/libgo/go/text/template/exec.go b/libgo/go/text/template/exec.go
index b74bc3b01c9..acb88afee36 100644
--- a/libgo/go/text/template/exec.go
+++ b/libgo/go/text/template/exec.go
@@ -107,7 +107,7 @@ func (t *Template) Execute(wr io.Writer, data interface{}) (err error) {
 		vars: []variable{{"$", value}},
 	}
 	if t.Tree == nil || t.Root == nil {
-		state.errorf("must be parsed before execution")
+		state.errorf("%q is an incomplete or empty template", t.name)
 	}
 	state.walk(value, t.Root)
 	return
@@ -497,7 +497,13 @@ func (s *state) evalCall(dot, fun reflect.Value, name string, args []parse.Node,
 // validateType guarantees that the value is valid and assignable to the type.
 func (s *state) validateType(value reflect.Value, typ reflect.Type) reflect.Value {
 	if !value.IsValid() {
-		s.errorf("invalid value; expected %s", typ)
+		switch typ.Kind() {
+		case reflect.Interface, reflect.Ptr, reflect.Chan, reflect.Map, reflect.Slice, reflect.Func:
+			// An untyped nil interface{}. Accept as a proper nil value.
+			value = reflect.Zero(typ)
+		default:
+			s.errorf("invalid value; expected %s", typ)
+		}
 	}
 	if !value.Type().AssignableTo(typ) {
 		// Does one dereference or indirection work? We could do more, as we
diff --git a/libgo/go/text/template/exec_test.go b/libgo/go/text/template/exec_test.go
index cf3c4157281..e33988b86c0 100644
--- a/libgo/go/text/template/exec_test.go
+++ b/libgo/go/text/template/exec_test.go
@@ -157,6 +157,10 @@ func (t *T) Method2(a uint16, b string) string {
 	return fmt.Sprintf("Method2: %d %s", a, b)
 }
 
+func (t *T) Method3(v interface{}) string {
+	return fmt.Sprintf("Method3: %v", v)
+}
+
 func (t *T) MAdd(a int, b []int) []int {
 	v := make([]int, len(b))
 	for i, x := range b {
@@ -293,6 +297,7 @@ var execTests = []execTest{
 	{".Method2(3, .X)", "-{{.Method2 3 .X}}-", "-Method2: 3 x-", tVal, true},
 	{".Method2(.U16, `str`)", "-{{.Method2 .U16 `str`}}-", "-Method2: 16 str-", tVal, true},
 	{".Method2(.U16, $x)", "{{if $x := .X}}-{{.Method2 .U16 $x}}{{end}}-", "-Method2: 16 x-", tVal, true},
+	{".Method3(nil)", "-{{.Method3 .MXI.unset}}-", "-Method3: <nil>-", tVal, true},
 	{"method on var", "{{if $x := .}}-{{$x.Method2 .U16 $x.X}}{{end}}-", "-Method2: 16 x-", tVal, true},
 	{"method on chained var",
 		"{{range .MSIone}}{{if $.U.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
@@ -322,6 +327,8 @@ var execTests = []execTest{
 	{"if slice", "{{if .SI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
 	{"if emptymap", "{{if .MSIEmpty}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
 	{"if map", "{{if .MSI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
+	{"if map unset", "{{if .MXI.none}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
+	{"if map not unset", "{{if not .MXI.none}}ZERO{{else}}NON-ZERO{{end}}", "ZERO", tVal, true},
 	{"if $x with $y int", "{{if $x := true}}{{with $y := .I}}{{$x}},{{$y}}{{end}}{{end}}", "true,17", tVal, true},
 	{"if $x with $x int", "{{if $x := true}}{{with $x := .I}}{{$x}},{{end}}{{$x}}{{end}}", "17,true", tVal, true},
 
diff --git a/libgo/go/time/sys_unix.go b/libgo/go/time/sys_unix.go
index 55ae5f7da28..56a7414e0ce 100644
--- a/libgo/go/time/sys_unix.go
+++ b/libgo/go/time/sys_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package time
 
diff --git a/libgo/go/time/time.go b/libgo/go/time/time.go
index e58099676f0..33d557f7369 100644
--- a/libgo/go/time/time.go
+++ b/libgo/go/time/time.go
@@ -7,6 +7,8 @@
 // The calendrical calculations always assume a Gregorian calendar.
 package time
 
+import "errors"
+
 // A Time represents an instant in time with nanosecond precision.
 //
 // Programs using times should typically store and pass them as values,
@@ -564,6 +566,20 @@ func (t Time) Sub(u Time) Duration {
 	return Duration(t.sec-u.sec)*Second + Duration(t.nsec-u.nsec)
 }
 
+// AddDate returns the time corresponding to adding the
+// given number of years, months, and days to t.
+// For example, AddDate(-1, 2, 3) applied to January 1, 2011
+// returns March 4, 2010.
+//
+// AddDate normalizes its result in the same way that Date does,
+// so, for example, adding one month to October 31 yields
+// December 1, the normalized form for November 31.
+func (t Time) AddDate(years int, months int, days int) Time {
+	year, month, day := t.Date()
+	hour, min, sec := t.Clock()
+	return Date(year+years, month+Month(months), day+days, hour, min, sec, int(t.nsec), t.loc)
+}
+
 const (
 	secondsPerMinute = 60
 	secondsPerHour   = 60 * 60
@@ -751,11 +767,11 @@ func (t Time) GobEncode() ([]byte, error) {
 	} else {
 		_, offset := t.Zone()
 		if offset%60 != 0 {
-			return nil, gobError("Time.GobEncode: zone offset has fractional minute")
+			return nil, errors.New("Time.GobEncode: zone offset has fractional minute")
 		}
 		offset /= 60
 		if offset < -32768 || offset == -1 || offset > 32767 {
-			return nil, gobError("Time.GobEncode: unexpected zone offset")
+			return nil, errors.New("Time.GobEncode: unexpected zone offset")
 		}
 		offsetMin = int16(offset)
 	}
@@ -784,15 +800,15 @@ func (t Time) GobEncode() ([]byte, error) {
 // GobDecode implements the gob.GobDecoder interface.
 func (t *Time) GobDecode(buf []byte) error {
 	if len(buf) == 0 {
-		return gobError("Time.GobDecode: no data")
+		return errors.New("Time.GobDecode: no data")
 	}
 
 	if buf[0] != timeGobVersion {
-		return gobError("Time.GobDecode: unsupported version")
+		return errors.New("Time.GobDecode: unsupported version")
 	}
 
 	if len(buf) != /*version*/ 1+ /*sec*/ 8+ /*nsec*/ 4+ /*zone offset*/ 2 {
-		return gobError("Time.GobDecode: invalid length")
+		return errors.New("Time.GobDecode: invalid length")
 	}
 
 	buf = buf[1:]
@@ -816,6 +832,52 @@ func (t *Time) GobDecode(buf []byte) error {
 	return nil
 }
 
+// MarshalJSON implements the json.Marshaler interface.
+// Time is formatted as RFC3339.
+func (t Time) MarshalJSON() ([]byte, error) {
+	yearInt := t.Year()
+	if yearInt < 0 || yearInt > 9999 {
+		return nil, errors.New("Time.MarshalJSON: year outside of range [0,9999]")
+	}
+
+	// We need a four-digit year, but Format produces variable-width years.
+	year := itoa(yearInt)
+	year = "0000"[:4-len(year)] + year
+
+	var formattedTime string
+	if t.nsec == 0 {
+		// RFC3339, no fractional second
+		formattedTime = t.Format("-01-02T15:04:05Z07:00")
+	} else {
+		// RFC3339 with fractional second
+		formattedTime = t.Format("-01-02T15:04:05.000000000Z07:00")
+
+		// Trim trailing zeroes from fractional second.
+		const nanoEnd = 24 // Index of last digit of fractional second
+		var i int
+		for i = nanoEnd; formattedTime[i] == '0'; i-- {
+			// Seek backwards until first significant digit is found.
+		}
+
+		formattedTime = formattedTime[:i+1] + formattedTime[nanoEnd+1:]
+	}
+
+	buf := make([]byte, 0, 1+len(year)+len(formattedTime)+1)
+	buf = append(buf, '"')
+	buf = append(buf, year...)
+	buf = append(buf, formattedTime...)
+	buf = append(buf, '"')
+	return buf, nil
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+// Time is expected in RFC3339 format.
+func (t *Time) UnmarshalJSON(data []byte) (err error) {
+	*t, err = Parse("\""+RFC3339+"\"", string(data))
+	// Fractional seconds are handled implicitly by Parse.
+	return
+}
+
 // Unix returns the local Time corresponding to the given Unix time,
 // sec seconds and nsec nanoseconds since January 1, 1970 UTC.
 // It is valid to pass nsec outside the range [0, 999999999].
diff --git a/libgo/go/time/time_test.go b/libgo/go/time/time_test.go
index 2a22e7b2746..484ae4266a3 100644
--- a/libgo/go/time/time_test.go
+++ b/libgo/go/time/time_test.go
@@ -7,6 +7,7 @@ package time_test
 import (
 	"bytes"
 	"encoding/gob"
+	"encoding/json"
 	"strconv"
 	"strings"
 	"testing"
@@ -634,6 +635,32 @@ func TestDate(t *testing.T) {
 	}
 }
 
+// Several ways of getting from
+// Fri Nov 18 7:56:35 PST 2011
+// to
+// Thu Mar 19 7:56:35 PST 2016
+var addDateTests = []struct {
+	years, months, days int
+}{
+	{4, 4, 1},
+	{3, 16, 1},
+	{3, 15, 30},
+	{5, -6, -18 - 30 - 12},
+}
+
+func TestAddDate(t *testing.T) {
+	t0 := Date(2011, 11, 18, 7, 56, 35, 0, UTC)
+	t1 := Date(2016, 3, 19, 7, 56, 35, 0, UTC)
+	for _, at := range addDateTests {
+		time := t0.AddDate(at.years, at.months, at.days)
+		if !time.Equal(t1) {
+			t.Errorf("AddDate(%d, %d, %d) = %v, want %v",
+				at.years, at.months, at.days,
+				time, t1)
+		}
+	}
+}
+
 var daysInTests = []struct {
 	year, month, di int
 }{
@@ -668,6 +695,12 @@ func TestAddToExactSecond(t *testing.T) {
 	}
 }
 
+func equalTimeAndZone(a, b Time) bool {
+	aname, aoffset := a.Zone()
+	bname, boffset := b.Zone()
+	return a.Equal(b) && aoffset == boffset && aname == bname
+}
+
 var gobTests = []Time{
 	Date(0, 1, 2, 3, 4, 5, 6, UTC),
 	Date(7, 8, 9, 10, 11, 12, 13, FixedZone("", 0)),
@@ -687,12 +720,8 @@ func TestTimeGob(t *testing.T) {
 			t.Errorf("%v gob Encode error = %q, want nil", tt, err)
 		} else if err := dec.Decode(&gobtt); err != nil {
 			t.Errorf("%v gob Decode error = %q, want nil", tt, err)
-		} else {
-			gobname, goboffset := gobtt.Zone()
-			name, offset := tt.Zone()
-			if !gobtt.Equal(tt) || goboffset != offset || gobname != name {
-				t.Errorf("Decoded time = %v, want %v", gobtt, tt)
-			}
+		} else if !equalTimeAndZone(gobtt, tt) {
+			t.Errorf("Decoded time = %v, want %v", gobtt, tt)
 		}
 		b.Reset()
 	}
@@ -736,6 +765,57 @@ func TestNotGobEncodableTime(t *testing.T) {
 	}
 }
 
+var jsonTests = []struct {
+	time Time
+	json string
+}{
+	{Date(9999, 4, 12, 23, 20, 50, .52*1e9, UTC), `"9999-04-12T23:20:50.52Z"`},
+	{Date(1996, 12, 19, 16, 39, 57, 0, Local), `"1996-12-19T16:39:57-08:00"`},
+	{Date(0, 1, 1, 0, 0, 0, 1, FixedZone("", 1*60)), `"0000-01-01T00:00:00.000000001+00:01"`},
+}
+
+func TestTimeJSON(t *testing.T) {
+	for _, tt := range jsonTests {
+		var jsonTime Time
+
+		if jsonBytes, err := json.Marshal(tt.time); err != nil {
+			t.Errorf("%v json.Marshal error = %v, want nil", tt.time, err)
+		} else if string(jsonBytes) != tt.json {
+			t.Errorf("%v JSON = %q, want %q", tt.time, string(jsonBytes), tt.json)
+		} else if err = json.Unmarshal(jsonBytes, &jsonTime); err != nil {
+			t.Errorf("%v json.Unmarshal error = %v, want nil", tt.time, err)
+		} else if !equalTimeAndZone(jsonTime, tt.time) {
+			t.Errorf("Unmarshaled time = %v, want %v", jsonTime, tt.time)
+		}
+	}
+}
+
+func TestInvalidTimeJSON(t *testing.T) {
+	var tt Time
+	err := json.Unmarshal([]byte(`{"now is the time":"buddy"}`), &tt)
+	_, isParseErr := err.(*ParseError)
+	if !isParseErr {
+		t.Errorf("expected *time.ParseError unmarshaling JSON, got %v", err)
+	}
+}
+
+var notJSONEncodableTimes = []struct {
+	time Time
+	want string
+}{
+	{Date(10000, 1, 1, 0, 0, 0, 0, UTC), "Time.MarshalJSON: year outside of range [0,9999]"},
+	{Date(-1, 1, 1, 0, 0, 0, 0, UTC), "Time.MarshalJSON: year outside of range [0,9999]"},
+}
+
+func TestNotJSONEncodableTime(t *testing.T) {
+	for _, tt := range notJSONEncodableTimes {
+		_, err := tt.time.MarshalJSON()
+		if err == nil || err.Error() != tt.want {
+			t.Errorf("%v MarshalJSON error = %v, want %v", tt.time, err, tt.want)
+		}
+	}
+}
+
 func BenchmarkNow(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		Now()
diff --git a/libgo/go/time/zoneinfo_unix.go b/libgo/go/time/zoneinfo_unix.go
index 83d5b983c6e..540b653c57d 100644
--- a/libgo/go/time/zoneinfo_unix.go
+++ b/libgo/go/time/zoneinfo_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Parse "zoneinfo" time zone file.
 // This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.
diff --git a/libgo/go/websocket/server.go b/libgo/go/websocket/server.go
index 8320b032ead..63f48e25693 100644
--- a/libgo/go/websocket/server.go
+++ b/libgo/go/websocket/server.go
@@ -74,7 +74,7 @@ A trivial example server:
 		http.Handle("/echo", websocket.Handler(EchoServer));
 		err := http.ListenAndServe(":12345", nil);
 		if err != nil {
-			panic("ListenAndServe: " + err.String())
+			panic("ListenAndServe: " + err.Error())
 		}
 	}
 */
diff --git a/libgo/merge.sh b/libgo/merge.sh
index 496abe53ad5..c8a57ca2816 100755
--- a/libgo/merge.sh
+++ b/libgo/merge.sh
@@ -168,8 +168,8 @@ for f in $runtime; do
   merge_c $f $f
 done
 
-merge_c linux/thread.c thread-linux.c
-merge_c linux/mem.c mem.c
+merge_c thread_linux.c thread-linux.c
+merge_c mem_linux.c mem.c
 
 (cd ${OLDDIR}/src/pkg && find . -name '*.go' -print) | while read f; do
   oldfile=${OLDDIR}/src/pkg/$f
diff --git a/libgo/runtime/goc2c.c b/libgo/runtime/goc2c.c
index fe413fe42af..93031ffe253 100644
--- a/libgo/runtime/goc2c.c
+++ b/libgo/runtime/goc2c.c
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build ignore
+
 /*
  * Translate a .goc file into a .c file.  A .goc file is a combination
  * of a limited form of Go with C.
@@ -774,6 +776,7 @@ main(int argc, char **argv)
 		}
 	}
 
+	printf("// AUTO-GENERATED by autogen.sh; DO NOT EDIT\n\n");
 	process_file();
 	exit(0);
 }
diff --git a/libgo/runtime/lock_futex.c b/libgo/runtime/lock_futex.c
index 4f3d507726d..cdc12d7c75c 100644
--- a/libgo/runtime/lock_futex.c
+++ b/libgo/runtime/lock_futex.c
@@ -2,17 +2,19 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build freebsd linux
+
 #include "runtime.h"
 
 // This implementation depends on OS-specific implementations of
 //
-//	runtime.futexsleep(uint32 *addr, uint32 val, int64 ns)
+//	runtime_futexsleep(uint32 *addr, uint32 val, int64 ns)
 //		Atomically,
 //			if(*addr == val) sleep
 //		Might be woken up spuriously; that's allowed.
 //		Don't sleep longer than ns; ns < 0 means forever.
 //
-//	runtime.futexwakeup(uint32 *addr, uint32 cnt)
+//	runtime_futexwakeup(uint32 *addr, uint32 cnt)
 //		If any procs are sleeping on addr, wake up at most cnt.
 
 enum
diff --git a/libgo/runtime/lock_sema.c b/libgo/runtime/lock_sema.c
index 6b4fffbdcf8..b2a8f53be41 100644
--- a/libgo/runtime/lock_sema.c
+++ b/libgo/runtime/lock_sema.c
@@ -2,21 +2,23 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build darwin netbsd openbsd plan9 windows
+
 #include "runtime.h"
 
 // This implementation depends on OS-specific implementations of
 //
-//	uintptr runtime.semacreate(void)
+//	uintptr runtime_semacreate(void)
 //		Create a semaphore, which will be assigned to m->waitsema.
 //		The zero value is treated as absence of any semaphore,
 //		so be sure to return a non-zero value.
 //
-//	int32 runtime.semasleep(int64 ns)
+//	int32 runtime_semasleep(int64 ns)
 //		If ns < 0, acquire m->waitsema and return 0.
 //		If ns >= 0, try to acquire m->waitsema for at most ns nanoseconds.
 //		Return 0 if the semaphore was acquired, -1 if interrupted or timed out.
 //
-//	int32 runtime.semawakeup(M *mp)
+//	int32 runtime_semawakeup(M *mp)
 //		Wake up mp, which is or will soon be sleeping on mp->waitsema.
 //
 
diff --git a/libgo/runtime/mprof.goc b/libgo/runtime/mprof.goc
index f44f45083f7..d143d19e5ba 100644
--- a/libgo/runtime/mprof.goc
+++ b/libgo/runtime/mprof.goc
@@ -12,8 +12,6 @@ package runtime
 #include "defs.h"
 #include "go-type.h"
 
-typedef struct __go_open_array Slice;
-
 // NOTE(rsc): Everything here could use cas if contention became an issue.
 static Lock proflock;
 
diff --git a/libgo/runtime/runtime.h b/libgo/runtime/runtime.h
index 040a1b617c8..94113b8db83 100644
--- a/libgo/runtime/runtime.h
+++ b/libgo/runtime/runtime.h
@@ -196,7 +196,7 @@ enum
 
 /* Macros.  */
 
-#ifdef __WINDOWS__
+#ifdef GOOS_windows
 enum {
    Windows = 1
 };
@@ -343,7 +343,6 @@ void	runtime_panic(Eface);
 #define runtime_printf printf
 #define runtime_malloc(s) __go_alloc(s)
 #define runtime_free(p) __go_free(p)
-#define runtime_memclr(buf, size) __builtin_memset((buf), 0, (size))
 #define runtime_strcmp(s1, s2) __builtin_strcmp((s1), (s2))
 #define runtime_mcmp(a, b, s) __builtin_memcmp((a), (b), (s))
 #define runtime_memmove(a, b, s) __builtin_memmove((a), (b), (s))
@@ -352,9 +351,6 @@ MCache*	runtime_allocmcache(void);
 void	free(void *v);
 struct __go_func_type;
 bool	runtime_addfinalizer(void*, void(*fn)(void*), const struct __go_func_type *);
-#define runtime_mmap mmap
-#define runtime_munmap munmap
-#define runtime_madvise madvise
 #define runtime_cas(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
 #define runtime_casp(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
 #define runtime_xadd(p, v) __sync_add_and_fetch (p, v)
@@ -384,6 +380,14 @@ void	runtime_osyield(void);
 void	runtime_LockOSThread(void) __asm__("libgo_runtime.runtime.LockOSThread");
 void	runtime_UnlockOSThread(void) __asm__("libgo_runtime.runtime.UnlockOSThread");
 
+/*
+ * low level C-called
+ */
+#define runtime_mmap mmap
+#define runtime_munmap munmap
+#define runtime_madvise madvise
+#define runtime_memclr(buf, size) __builtin_memset((buf), 0, (size))
+
 struct __go_func_type;
 void reflect_call(const struct __go_func_type *, const void *, _Bool, _Bool,
 		  void **, void **)
diff --git a/libgo/runtime/string.goc b/libgo/runtime/string.goc
index fbbe393bbef..486caf09a42 100644
--- a/libgo/runtime/string.goc
+++ b/libgo/runtime/string.goc
@@ -4,6 +4,9 @@
 
 package runtime
 #include "runtime.h"
+#include "arch.h"
+#include "malloc.h"
+
 #define charntorune(pv, str, len) __go_get_rune(str, len, pv)
 
 int32