diff --git a/src/compiletest/compiletest.rs b/src/compiletest/compiletest.rs
index 701f8899fa4..8fcad94ee1c 100644
--- a/src/compiletest/compiletest.rs
+++ b/src/compiletest/compiletest.rs
@@ -188,41 +188,41 @@ pub fn parse_config(args: Vec<String> ) -> Config {
 
 pub fn log_config(config: &Config) {
     let c = config;
-    logv(c, format_strbuf!("configuration:"));
-    logv(c, format_strbuf!("compile_lib_path: {}", config.compile_lib_path));
-    logv(c, format_strbuf!("run_lib_path: {}", config.run_lib_path));
-    logv(c, format_strbuf!("rustc_path: {}", config.rustc_path.display()));
-    logv(c, format_strbuf!("src_base: {}", config.src_base.display()));
-    logv(c, format_strbuf!("build_base: {}", config.build_base.display()));
-    logv(c, format_strbuf!("stage_id: {}", config.stage_id));
-    logv(c, format_strbuf!("mode: {}", config.mode));
-    logv(c, format_strbuf!("run_ignored: {}", config.run_ignored));
-    logv(c, format_strbuf!("filter: {}",
-                           opt_str(&config.filter
-                                          .as_ref()
-                                          .map(|re| {
-                                              re.to_str().into_string()
-                                          }))));
-    logv(c, format_strbuf!("runtool: {}", opt_str(&config.runtool)));
-    logv(c, format_strbuf!("host-rustcflags: {}",
-                           opt_str(&config.host_rustcflags)));
-    logv(c, format_strbuf!("target-rustcflags: {}",
-                           opt_str(&config.target_rustcflags)));
-    logv(c, format_strbuf!("jit: {}", config.jit));
-    logv(c, format_strbuf!("target: {}", config.target));
-    logv(c, format_strbuf!("host: {}", config.host));
-    logv(c, format_strbuf!("android-cross-path: {}",
-                           config.android_cross_path.display()));
-    logv(c, format_strbuf!("adb_path: {}", config.adb_path));
-    logv(c, format_strbuf!("adb_test_dir: {}", config.adb_test_dir));
-    logv(c, format_strbuf!("adb_device_status: {}",
-                           config.adb_device_status));
+    logv(c, format!("configuration:"));
+    logv(c, format!("compile_lib_path: {}", config.compile_lib_path));
+    logv(c, format!("run_lib_path: {}", config.run_lib_path));
+    logv(c, format!("rustc_path: {}", config.rustc_path.display()));
+    logv(c, format!("src_base: {}", config.src_base.display()));
+    logv(c, format!("build_base: {}", config.build_base.display()));
+    logv(c, format!("stage_id: {}", config.stage_id));
+    logv(c, format!("mode: {}", config.mode));
+    logv(c, format!("run_ignored: {}", config.run_ignored));
+    logv(c, format!("filter: {}",
+                    opt_str(&config.filter
+                                   .as_ref()
+                                   .map(|re| {
+                                       re.to_str().into_string()
+                                   }))));
+    logv(c, format!("runtool: {}", opt_str(&config.runtool)));
+    logv(c, format!("host-rustcflags: {}",
+                    opt_str(&config.host_rustcflags)));
+    logv(c, format!("target-rustcflags: {}",
+                    opt_str(&config.target_rustcflags)));
+    logv(c, format!("jit: {}", config.jit));
+    logv(c, format!("target: {}", config.target));
+    logv(c, format!("host: {}", config.host));
+    logv(c, format!("android-cross-path: {}",
+                    config.android_cross_path.display()));
+    logv(c, format!("adb_path: {}", config.adb_path));
+    logv(c, format!("adb_test_dir: {}", config.adb_test_dir));
+    logv(c, format!("adb_device_status: {}",
+                    config.adb_device_status));
     match config.test_shard {
         None => logv(c, "test_shard: (all)".to_string()),
-        Some((a,b)) => logv(c, format_strbuf!("test_shard: {}.{}", a, b))
+        Some((a,b)) => logv(c, format!("test_shard: {}.{}", a, b))
     }
-    logv(c, format_strbuf!("verbose: {}", config.verbose));
-    logv(c, format_strbuf!("\n"));
+    logv(c, format!("verbose: {}", config.verbose));
+    logv(c, format!("\n"));
 }
 
 pub fn opt_str<'a>(maybestr: &'a Option<String>) -> &'a str {
@@ -356,12 +356,10 @@ pub fn make_test_name(config: &Config, testfile: &Path) -> test::TestName {
         let filename = path.filename_str();
         let p = path.dir_path();
         let dir = p.filename_str();
-        format_strbuf!("{}/{}", dir.unwrap_or(""), filename.unwrap_or(""))
+        format!("{}/{}", dir.unwrap_or(""), filename.unwrap_or(""))
     }
 
-    test::DynTestName(format_strbuf!("[{}] {}",
-                                     config.mode,
-                                     shorten(testfile)))
+    test::DynTestName(format!("[{}] {}", config.mode, shorten(testfile)))
 }
 
 pub fn make_test_closure(config: &Config, testfile: &Path) -> test::TestFn {
diff --git a/src/compiletest/header.rs b/src/compiletest/header.rs
index 531f51f982f..4b0b68bca99 100644
--- a/src/compiletest/header.rs
+++ b/src/compiletest/header.rs
@@ -120,11 +120,11 @@ pub fn load_props(testfile: &Path) -> TestProps {
 
 pub fn is_test_ignored(config: &Config, testfile: &Path) -> bool {
     fn ignore_target(config: &Config) -> String {
-        format_strbuf!("ignore-{}", util::get_os(config.target.as_slice()))
+        format!("ignore-{}", util::get_os(config.target.as_slice()))
     }
     fn ignore_stage(config: &Config) -> String {
-        format_strbuf!("ignore-{}",
-                       config.stage_id.as_slice().split('-').next().unwrap())
+        format!("ignore-{}",
+                config.stage_id.as_slice().split('-').next().unwrap())
     }
 
     let val = iter_header(testfile, |ln| {
@@ -243,7 +243,7 @@ fn parse_name_directive(line: &str, directive: &str) -> bool {
 
 pub fn parse_name_value_directive(line: &str, directive: String)
                                   -> Option<String> {
-    let keycolon = format_strbuf!("{}:", directive);
+    let keycolon = format!("{}:", directive);
     match line.find_str(keycolon.as_slice()) {
         Some(colon) => {
             let value = line.slice(colon + keycolon.len(),
diff --git a/src/compiletest/runtest.rs b/src/compiletest/runtest.rs
index 7ad302646b3..8429e83a7aa 100644
--- a/src/compiletest/runtest.rs
+++ b/src/compiletest/runtest.rs
@@ -121,8 +121,7 @@ fn check_correct_failure_status(proc_res: &ProcRes) {
     static RUST_ERR: int = 101;
     if !proc_res.status.matches_exit_status(RUST_ERR) {
         fatal_ProcRes(
-            format_strbuf!("failure produced the wrong error: {}",
-                           proc_res.status),
+            format!("failure produced the wrong error: {}", proc_res.status),
             proc_res);
     }
 }
@@ -165,7 +164,7 @@ fn run_pretty_test(config: &Config, props: &TestProps, testfile: &Path) {
 
     let mut round = 0;
     while round < rounds {
-        logv(config, format_strbuf!("pretty-printing round {}", round));
+        logv(config, format!("pretty-printing round {}", round));
         let proc_res = print_source(config,
                                     props,
                                     testfile,
@@ -173,8 +172,7 @@ fn run_pretty_test(config: &Config, props: &TestProps, testfile: &Path) {
                                     "normal");
 
         if !proc_res.status.success() {
-            fatal_ProcRes(format_strbuf!("pretty-printing failed in round {}",
-                                         round),
+            fatal_ProcRes(format!("pretty-printing failed in round {}", round),
                           &proc_res);
         }
 
@@ -214,15 +212,14 @@ fn run_pretty_test(config: &Config, props: &TestProps, testfile: &Path) {
     // additionally, run `--pretty expanded` and try to build it.
     let proc_res = print_source(config, props, testfile, (*srcs.get(round)).clone(), "expanded");
     if !proc_res.status.success() {
-        fatal_ProcRes(format_strbuf!("pretty-printing (expanded) failed"),
-                                     &proc_res);
+        fatal_ProcRes(format!("pretty-printing (expanded) failed"), &proc_res);
     }
 
     let ProcRes{ stdout: expanded_src, .. } = proc_res;
     let proc_res = typecheck_source(config, props, testfile, expanded_src);
     if !proc_res.status.success() {
-        fatal_ProcRes(format_strbuf!("pretty-printed source (expanded) does \
-                                      not typecheck"),
+        fatal_ProcRes(format!("pretty-printed source (expanded) does \
+                               not typecheck"),
                       &proc_res);
     }
 
@@ -253,7 +250,7 @@ fn run_pretty_test(config: &Config, props: &TestProps, testfile: &Path) {
         let mut args = vec!("-".to_string(),
                             "--pretty".to_string(),
                             pretty_type,
-                            format_strbuf!("--target={}", config.target),
+                            format!("--target={}", config.target),
                             "-L".to_string(),
                             aux_dir.as_str().unwrap().to_string());
         args.push_all_move(split_maybe_args(&config.target_rustcflags));
@@ -300,7 +297,7 @@ actual:\n\
         let mut args = vec!("-".to_string(),
                             "--no-trans".to_string(),
                             "--crate-type=lib".to_string(),
-                            format_strbuf!("--target={}", target),
+                            format!("--target={}", target),
                             "-L".to_string(),
                             config.build_base.as_str().unwrap().to_string(),
                             "-L".to_string(),
@@ -343,10 +340,8 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
 
             // write debugger script
             let script_str = ["set charset UTF-8".to_string(),
-                              format_strbuf!("file {}",
-                                             exe_file.as_str()
-                                                     .unwrap()
-                                                     .to_string()),
+                              format!("file {}", exe_file.as_str().unwrap()
+                                                         .to_string()),
                               "target remote :5039".to_string(),
                               cmds,
                               "quit".to_string()].connect("\n");
@@ -366,8 +361,7 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
                          ],
                          vec!(("".to_string(), "".to_string())),
                          Some("".to_string()))
-                .expect(format_strbuf!("failed to exec `{}`",
-                                       config.adb_path));
+                .expect(format!("failed to exec `{}`", config.adb_path));
 
             procsrv::run("",
                          config.adb_path.as_slice(),
@@ -378,15 +372,15 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
                          ],
                          vec!(("".to_string(), "".to_string())),
                          Some("".to_string()))
-                .expect(format_strbuf!("failed to exec `{}`", config.adb_path));
+                .expect(format!("failed to exec `{}`", config.adb_path));
 
-            let adb_arg = format_strbuf!("export LD_LIBRARY_PATH={}; \
-                                          gdbserver :5039 {}/{}",
-                                         config.adb_test_dir.clone(),
-                                         config.adb_test_dir.clone(),
-                                         str::from_utf8(
-                                             exe_file.filename()
-                                             .unwrap()).unwrap());
+            let adb_arg = format!("export LD_LIBRARY_PATH={}; \
+                                   gdbserver :5039 {}/{}",
+                                  config.adb_test_dir.clone(),
+                                  config.adb_test_dir.clone(),
+                                  str::from_utf8(
+                                      exe_file.filename()
+                                      .unwrap()).unwrap());
 
             let mut process = procsrv::run_background("",
                                                       config.adb_path
@@ -398,8 +392,7 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
                                                       vec!(("".to_string(),
                                                             "".to_string())),
                                                       Some("".to_string()))
-                .expect(format_strbuf!("failed to exec `{}`",
-                                       config.adb_path));
+                .expect(format!("failed to exec `{}`", config.adb_path));
             loop {
                 //waiting 1 second for gdbserver start
                 timer::sleep(1000);
@@ -423,8 +416,7 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
                 vec!("-quiet".to_string(),
                      "-batch".to_string(),
                      "-nx".to_string(),
-                     format_strbuf!("-command={}",
-                                    debugger_script.as_str().unwrap()));
+                     format!("-command={}", debugger_script.as_str().unwrap()));
 
             let gdb_path = tool_path.append("/bin/arm-linux-androideabi-gdb");
             let procsrv::Result {
@@ -436,12 +428,12 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
                              debugger_opts.as_slice(),
                              vec!(("".to_string(), "".to_string())),
                              None)
-                .expect(format_strbuf!("failed to exec `{}`", gdb_path));
+                .expect(format!("failed to exec `{}`", gdb_path));
             let cmdline = {
                 let cmdline = make_cmdline("",
                                            "arm-linux-androideabi-gdb",
                                            debugger_opts.as_slice());
-                logv(config, format_strbuf!("executing {}", cmdline));
+                logv(config, format!("executing {}", cmdline));
                 cmdline
             };
 
@@ -484,8 +476,7 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
                 vec!("-quiet".to_string(),
                      "-batch".to_string(),
                      "-nx".to_string(),
-                     format_strbuf!("-command={}",
-                                    debugger_script.as_str().unwrap()),
+                     format!("-command={}", debugger_script.as_str().unwrap()),
                      exe_file.as_str().unwrap().to_string());
             proc_args = ProcArgs {
                 prog: debugger(),
@@ -593,9 +584,8 @@ fn run_debuginfo_lldb_test(config: &Config, props: &TestProps, testfile: &Path)
                  str::from_utf8(error.as_slice()).unwrap().to_string())
             },
             Err(e) => {
-                fatal(format_strbuf!("Failed to setup Python process for \
-                                      LLDB script: {}",
-                                     e))
+                fatal(format!("Failed to setup Python process for \
+                               LLDB script: {}", e))
             }
         };
 
@@ -604,7 +594,7 @@ fn run_debuginfo_lldb_test(config: &Config, props: &TestProps, testfile: &Path)
             status: status,
             stdout: out,
             stderr: err,
-            cmdline: format_strbuf!("{}", cmd)
+            cmdline: format!("{}", cmd)
         };
     }
 }
@@ -647,9 +637,7 @@ fn parse_debugger_commands(file_path: &Path, debugger_prefix: &str)
                 });
             }
             Err(e) => {
-                fatal(format_strbuf!("Error while parsing debugger commands: \
-                                      {}",
-                                     e))
+                fatal(format!("Error while parsing debugger commands: {}", e))
             }
         }
         counter += 1;
@@ -732,9 +720,8 @@ fn check_debugger_output(debugger_run_result: &ProcRes, check_lines: &[String])
             }
         }
         if i != num_check_lines {
-            fatal_ProcRes(format_strbuf!("line not found in debugger output: \
-                                          {}",
-                                         check_lines.get(i).unwrap()),
+            fatal_ProcRes(format!("line not found in debugger output: {}",
+                                  check_lines.get(i).unwrap()),
                           debugger_run_result);
         }
     }
@@ -744,8 +731,8 @@ fn check_error_patterns(props: &TestProps,
                         testfile: &Path,
                         proc_res: &ProcRes) {
     if props.error_patterns.is_empty() {
-        fatal(format_strbuf!("no error pattern specified in {}",
-                             testfile.display().as_maybe_owned().as_slice()));
+        fatal(format!("no error pattern specified in {}",
+                      testfile.display().as_maybe_owned().as_slice()));
     }
 
     if proc_res.status.success() {
@@ -756,7 +743,7 @@ fn check_error_patterns(props: &TestProps,
     let mut next_err_pat = props.error_patterns.get(next_err_idx);
     let mut done = false;
     let output_to_check = if props.check_stdout {
-        format_strbuf!("{}{}", proc_res.stdout, proc_res.stderr)
+        format!("{}{}", proc_res.stdout, proc_res.stderr)
     } else {
         proc_res.stderr.clone()
     };
@@ -777,12 +764,12 @@ fn check_error_patterns(props: &TestProps,
     let missing_patterns =
         props.error_patterns.slice(next_err_idx, props.error_patterns.len());
     if missing_patterns.len() == 1u {
-        fatal_ProcRes(format_strbuf!("error pattern '{}' not found!",
-                                     missing_patterns[0]),
+        fatal_ProcRes(format!("error pattern '{}' not found!",
+                              missing_patterns[0]),
                       proc_res);
     } else {
         for pattern in missing_patterns.iter() {
-            error(format_strbuf!("error pattern '{}' not found!", *pattern));
+            error(format!("error pattern '{}' not found!", *pattern));
         }
         fatal_ProcRes("multiple error patterns not found".to_string(),
                       proc_res);
@@ -811,7 +798,7 @@ fn check_expected_errors(expected_errors: Vec<errors::ExpectedError> ,
     }
 
     let prefixes = expected_errors.iter().map(|ee| {
-        format_strbuf!("{}:{}:", testfile.display(), ee.line)
+        format!("{}:{}:", testfile.display(), ee.line)
     }).collect::<Vec<String> >();
 
     #[cfg(target_os = "win32")]
@@ -870,9 +857,8 @@ fn check_expected_errors(expected_errors: Vec<errors::ExpectedError> ,
         }
 
         if !was_expected && is_compiler_error_or_warning(line) {
-            fatal_ProcRes(format_strbuf!("unexpected compiler error or \
-                                          warning: '{}'",
-                                         line),
+            fatal_ProcRes(format!("unexpected compiler error or warning: '{}'",
+                                  line),
                           proc_res);
         }
     }
@@ -880,11 +866,8 @@ fn check_expected_errors(expected_errors: Vec<errors::ExpectedError> ,
     for (i, &flag) in found_flags.iter().enumerate() {
         if !flag {
             let ee = expected_errors.get(i);
-            fatal_ProcRes(format_strbuf!("expected {} on line {} not found: \
-                                          {}",
-                                         ee.kind,
-                                         ee.line,
-                                         ee.msg),
+            fatal_ProcRes(format!("expected {} on line {} not found: {}",
+                                  ee.kind, ee.line, ee.msg),
                           proc_res);
         }
     }
@@ -1065,8 +1048,8 @@ fn compose_and_run_compiler(
                                      None);
         if !auxres.status.success() {
             fatal_ProcRes(
-                format_strbuf!("auxiliary build of {} failed to compile: ",
-                               abs_ab.display()),
+                format!("auxiliary build of {} failed to compile: ",
+                        abs_ab.display()),
                 &auxres);
         }
 
@@ -1121,7 +1104,7 @@ fn make_compile_args(config: &Config,
     let mut args = vec!(testfile.as_str().unwrap().to_string(),
                         "-L".to_string(),
                         config.build_base.as_str().unwrap().to_string(),
-                        format_strbuf!("--target={}", target));
+                        format!("--target={}", target));
     args.push_all(extras.as_slice());
     if !props.no_prefer_dynamic {
         args.push("-C".to_string());
@@ -1213,7 +1196,7 @@ fn program_output(config: &Config, testfile: &Path, lib_path: &str, prog: String
             let cmdline = make_cmdline(lib_path,
                                        prog.as_slice(),
                                        args.as_slice());
-            logv(config, format_strbuf!("executing {}", cmdline));
+            logv(config, format!("executing {}", cmdline));
             cmdline
         };
     let procsrv::Result {
@@ -1224,8 +1207,7 @@ fn program_output(config: &Config, testfile: &Path, lib_path: &str, prog: String
                      prog.as_slice(),
                      args.as_slice(),
                      env,
-                     input).expect(format_strbuf!("failed to exec `{}`",
-                                                  prog));
+                     input).expect(format!("failed to exec `{}`", prog));
     dump_output(config, testfile, out.as_slice(), err.as_slice());
     return ProcRes {
         status: status,
@@ -1240,24 +1222,19 @@ fn program_output(config: &Config, testfile: &Path, lib_path: &str, prog: String
 #[cfg(target_os = "macos")]
 #[cfg(target_os = "freebsd")]
 fn make_cmdline(_libpath: &str, prog: &str, args: &[String]) -> String {
-    format_strbuf!("{} {}", prog, args.connect(" "))
+    format!("{} {}", prog, args.connect(" "))
 }
 
 #[cfg(target_os = "win32")]
 fn make_cmdline(libpath: &str, prog: &str, args: &[String]) -> String {
-    format_strbuf!("{} {} {}",
-                   lib_path_cmd_prefix(libpath),
-                   prog,
-                   args.connect(" "))
+    format!("{} {} {}", lib_path_cmd_prefix(libpath), prog, args.connect(" "))
 }
 
 // Build the LD_LIBRARY_PATH variable as it would be seen on the command line
 // for diagnostic purposes
 #[cfg(target_os = "win32")]
 fn lib_path_cmd_prefix(path: &str) -> String {
-    format_strbuf!("{}=\"{}\"",
-                   util::lib_path_env_var(),
-                   util::make_new_path(path))
+    format!("{}=\"{}\"", util::lib_path_env_var(), util::make_new_path(path))
 }
 
 fn dump_output(config: &Config, testfile: &Path, out: &str, err: &str) {
@@ -1356,7 +1333,7 @@ fn _arm_exec_compiled_test(config: &Config,
                                    ],
                                    vec!(("".to_string(), "".to_string())),
                                    Some("".to_string()))
-        .expect(format_strbuf!("failed to exec `{}`", config.adb_path));
+        .expect(format!("failed to exec `{}`", config.adb_path));
 
     if config.verbose {
         println!("push ({}) {} {} {}",
@@ -1366,19 +1343,18 @@ fn _arm_exec_compiled_test(config: &Config,
                  copy_result.err);
     }
 
-    logv(config, format_strbuf!("executing ({}) {}", config.target, cmdline));
+    logv(config, format!("executing ({}) {}", config.target, cmdline));
 
     let mut runargs = Vec::new();
 
     // run test via adb_run_wrapper
     runargs.push("shell".to_string());
     for (key, val) in env.move_iter() {
-        runargs.push(format_strbuf!("{}={}", key, val));
+        runargs.push(format!("{}={}", key, val));
     }
-    runargs.push(format_strbuf!("{}/adb_run_wrapper.sh",
-                                config.adb_test_dir));
-    runargs.push(format_strbuf!("{}", config.adb_test_dir));
-    runargs.push(format_strbuf!("{}", prog_short));
+    runargs.push(format!("{}/adb_run_wrapper.sh", config.adb_test_dir));
+    runargs.push(format!("{}", config.adb_test_dir));
+    runargs.push(format!("{}", prog_short));
 
     for tv in args.args.iter() {
         runargs.push(tv.to_string());
@@ -1387,15 +1363,13 @@ fn _arm_exec_compiled_test(config: &Config,
                  config.adb_path.as_slice(),
                  runargs.as_slice(),
                  vec!(("".to_string(), "".to_string())), Some("".to_string()))
-        .expect(format_strbuf!("failed to exec `{}`", config.adb_path));
+        .expect(format!("failed to exec `{}`", config.adb_path));
 
     // get exitcode of result
     runargs = Vec::new();
     runargs.push("shell".to_string());
     runargs.push("cat".to_string());
-    runargs.push(format_strbuf!("{}/{}.exitcode",
-                                config.adb_test_dir,
-                                prog_short));
+    runargs.push(format!("{}/{}.exitcode", config.adb_test_dir, prog_short));
 
     let procsrv::Result{ out: exitcode_out, err: _, status: _ } =
         procsrv::run("",
@@ -1403,7 +1377,7 @@ fn _arm_exec_compiled_test(config: &Config,
                      runargs.as_slice(),
                      vec!(("".to_string(), "".to_string())),
                      Some("".to_string()))
-        .expect(format_strbuf!("failed to exec `{}`", config.adb_path));
+        .expect(format!("failed to exec `{}`", config.adb_path));
 
     let mut exitcode: int = 0;
     for c in exitcode_out.as_slice().chars() {
@@ -1418,9 +1392,7 @@ fn _arm_exec_compiled_test(config: &Config,
     runargs = Vec::new();
     runargs.push("shell".to_string());
     runargs.push("cat".to_string());
-    runargs.push(format_strbuf!("{}/{}.stdout",
-                                config.adb_test_dir,
-                                prog_short));
+    runargs.push(format!("{}/{}.stdout", config.adb_test_dir, prog_short));
 
     let procsrv::Result{ out: stdout_out, err: _, status: _ } =
         procsrv::run("",
@@ -1428,15 +1400,13 @@ fn _arm_exec_compiled_test(config: &Config,
                      runargs.as_slice(),
                      vec!(("".to_string(), "".to_string())),
                      Some("".to_string()))
-        .expect(format_strbuf!("failed to exec `{}`", config.adb_path));
+        .expect(format!("failed to exec `{}`", config.adb_path));
 
     // get stderr of result
     runargs = Vec::new();
     runargs.push("shell".to_string());
     runargs.push("cat".to_string());
-    runargs.push(format_strbuf!("{}/{}.stderr",
-                                config.adb_test_dir,
-                                prog_short));
+    runargs.push(format!("{}/{}.stderr", config.adb_test_dir, prog_short));
 
     let procsrv::Result{ out: stderr_out, err: _, status: _ } =
         procsrv::run("",
@@ -1444,7 +1414,7 @@ fn _arm_exec_compiled_test(config: &Config,
                      runargs.as_slice(),
                      vec!(("".to_string(), "".to_string())),
                      Some("".to_string()))
-        .expect(format_strbuf!("failed to exec `{}`", config.adb_path));
+        .expect(format!("failed to exec `{}`", config.adb_path));
 
     dump_output(config,
                 testfile,
@@ -1478,8 +1448,7 @@ fn _arm_push_aux_shared_library(config: &Config, testfile: &Path) {
                                            vec!(("".to_string(),
                                                  "".to_string())),
                                            Some("".to_string()))
-                .expect(format_strbuf!("failed to exec `{}`",
-                                       config.adb_path));
+                .expect(format!("failed to exec `{}`", config.adb_path));
 
             if config.verbose {
                 println!("push ({}) {} {} {}",
@@ -1549,8 +1518,8 @@ fn extract_function_from_bitcode(config: &Config, _props: &TestProps,
     let proc_args = ProcArgs {
         // FIXME (#9639): This needs to handle non-utf8 paths
         prog: prog.as_str().unwrap().to_string(),
-        args: vec!(format_strbuf!("-func={}", fname),
-                   format_strbuf!("-o={}", extracted_bc.as_str().unwrap()),
+        args: vec!(format!("-func={}", fname),
+                   format!("-o={}", extracted_bc.as_str().unwrap()),
                    bitcodefile.as_str().unwrap().to_string())
     };
     compose_and_run(config, testfile, proc_args, Vec::new(), "", None)
@@ -1566,7 +1535,7 @@ fn disassemble_extract(config: &Config, _props: &TestProps,
     let proc_args = ProcArgs {
         // FIXME (#9639): This needs to handle non-utf8 paths
         prog: prog.as_str().unwrap().to_string(),
-        args: vec!(format_strbuf!("-o={}", extracted_ll.as_str().unwrap()),
+        args: vec!(format!("-o={}", extracted_ll.as_str().unwrap()),
                    extracted_bc.as_str().unwrap().to_string())
     };
     compose_and_run(config, testfile, proc_args, Vec::new(), "", None)
diff --git a/src/compiletest/util.rs b/src/compiletest/util.rs
index 8f1d5cceb2b..00f0689b96b 100644
--- a/src/compiletest/util.rs
+++ b/src/compiletest/util.rs
@@ -39,7 +39,7 @@ pub fn make_new_path(path: &str) -> String {
     // maintain the current value while adding our own
     match getenv(lib_path_env_var().as_slice()) {
       Some(curr) => {
-        format_strbuf!("{}{}{}", path, path_div(), curr)
+        format!("{}{}{}", path, path_div(), curr)
       }
       None => path.to_str().to_string()
     }
diff --git a/src/doc/complement-cheatsheet.md b/src/doc/complement-cheatsheet.md
index 759518b6769..f14b70afc7a 100644
--- a/src/doc/complement-cheatsheet.md
+++ b/src/doc/complement-cheatsheet.md
@@ -23,14 +23,14 @@ let y: int = x.unwrap();
 
 **Int to string, in non-base-10**
 
-Use the `format_strbuf!` syntax extension.
+Use the `format!` syntax extension.
 
 ~~~
 let x: int = 42;
-let y: String = format_strbuf!("{:t}", x);   // binary
-let y: String = format_strbuf!("{:o}", x);   // octal
-let y: String = format_strbuf!("{:x}", x);   // lowercase hexadecimal
-let y: String = format_strbuf!("{:X}", x);   // uppercase hexadecimal
+let y: String = format!("{:t}", x);   // binary
+let y: String = format!("{:o}", x);   // octal
+let y: String = format!("{:x}", x);   // lowercase hexadecimal
+let y: String = format!("{:X}", x);   // uppercase hexadecimal
 ~~~
 
 **String to int, in non-base-10**
diff --git a/src/libgetopts/lib.rs b/src/libgetopts/lib.rs
index c88b825811f..37c3fe0d2ef 100644
--- a/src/libgetopts/lib.rs
+++ b/src/libgetopts/lib.rs
@@ -500,19 +500,19 @@ impl Fail_ {
     pub fn to_err_msg(self) -> String {
         match self {
             ArgumentMissing(ref nm) => {
-                format_strbuf!("Argument to option '{}' missing.", *nm)
+                format!("Argument to option '{}' missing.", *nm)
             }
             UnrecognizedOption(ref nm) => {
-                format_strbuf!("Unrecognized option: '{}'.", *nm)
+                format!("Unrecognized option: '{}'.", *nm)
             }
             OptionMissing(ref nm) => {
-                format_strbuf!("Required option '{}' missing.", *nm)
+                format!("Required option '{}' missing.", *nm)
             }
             OptionDuplicated(ref nm) => {
-                format_strbuf!("Option '{}' given more than once.", *nm)
+                format!("Option '{}' given more than once.", *nm)
             }
             UnexpectedArgument(ref nm) => {
-                format_strbuf!("Option '{}' does not take an argument.", *nm)
+                format!("Option '{}' does not take an argument.", *nm)
             }
         }
     }
@@ -740,9 +740,8 @@ pub fn usage(brief: &str, opts: &[OptGroup]) -> String {
         row
     });
 
-    format_strbuf!("{}\n\nOptions:\n{}\n",
-                   brief,
-                   rows.collect::<Vec<String>>().connect("\n"))
+    format!("{}\n\nOptions:\n{}\n", brief,
+            rows.collect::<Vec<String>>().connect("\n"))
 }
 
 fn format_option(opt: &OptGroup) -> String {
@@ -784,7 +783,7 @@ fn format_option(opt: &OptGroup) -> String {
 
 /// Derive a short one-line usage summary from a set of long options.
 pub fn short_usage(program_name: &str, opts: &[OptGroup]) -> String {
-    let mut line = format_strbuf!("Usage: {} ", program_name);
+    let mut line = format!("Usage: {} ", program_name);
     line.push_str(opts.iter()
                       .map(format_option)
                       .collect::<Vec<String>>()
diff --git a/src/libnum/bigint.rs b/src/libnum/bigint.rs
index e8d0434c392..cc35cd749d6 100644
--- a/src/libnum/bigint.rs
+++ b/src/libnum/bigint.rs
@@ -1215,7 +1215,7 @@ impl ToStrRadix for BigInt {
         match self.sign {
             Plus  => self.data.to_str_radix(radix),
             Zero  => "0".to_string(),
-            Minus => format_strbuf!("-{}", self.data.to_str_radix(radix)),
+            Minus => format!("-{}", self.data.to_str_radix(radix)),
         }
     }
 }
@@ -2055,34 +2055,34 @@ mod biguint_tests {
             (16, "fff".to_string())
         )), ( BigUint::from_slice([ 1, 2 ]), vec!(
             (2,
-             format_strbuf!("10{}1", "0".repeat(bits - 1))),
+             format!("10{}1", "0".repeat(bits - 1))),
             (4,
-             format_strbuf!("2{}1", "0".repeat(bits / 2 - 1))),
+             format!("2{}1", "0".repeat(bits / 2 - 1))),
             (10, match bits {
                 32 => "8589934593".to_string(),
                 16 => "131073".to_string(),
                 _ => fail!()
             }),
             (16,
-             format_strbuf!("2{}1", "0".repeat(bits / 4 - 1)))
+             format!("2{}1", "0".repeat(bits / 4 - 1)))
         )), ( BigUint::from_slice([ 1, 2, 3 ]), vec!(
             (2,
-             format_strbuf!("11{}10{}1",
-                            "0".repeat(bits - 2),
-                            "0".repeat(bits - 1))),
+             format!("11{}10{}1",
+                     "0".repeat(bits - 2),
+                     "0".repeat(bits - 1))),
             (4,
-             format_strbuf!("3{}2{}1",
-                            "0".repeat(bits / 2 - 1),
-                            "0".repeat(bits / 2 - 1))),
+             format!("3{}2{}1",
+                     "0".repeat(bits / 2 - 1),
+                     "0".repeat(bits / 2 - 1))),
             (10, match bits {
                 32 => "55340232229718589441".to_string(),
                 16 => "12885032961".to_string(),
                 _ => fail!()
             }),
             (16,
-             format_strbuf!("3{}2{}1",
-                            "0".repeat(bits / 4 - 1),
-                            "0".repeat(bits / 4 - 1)))
+             format!("3{}2{}1",
+                     "0".repeat(bits / 4 - 1),
+                     "0".repeat(bits / 4 - 1)))
         )) )
     }
 
diff --git a/src/libnum/complex.rs b/src/libnum/complex.rs
index a4c21839214..6c5547b28e8 100644
--- a/src/libnum/complex.rs
+++ b/src/libnum/complex.rs
@@ -177,13 +177,13 @@ impl<T: fmt::Show + Num + Ord> fmt::Show for Complex<T> {
 impl<T: ToStrRadix + Num + Ord> ToStrRadix for Complex<T> {
     fn to_str_radix(&self, radix: uint) -> String {
         if self.im < Zero::zero() {
-            format_strbuf!("{}-{}i",
-                           self.re.to_str_radix(radix),
-                           (-self.im).to_str_radix(radix))
+            format!("{}-{}i",
+                    self.re.to_str_radix(radix),
+                    (-self.im).to_str_radix(radix))
         } else {
-            format_strbuf!("{}+{}i",
-                           self.re.to_str_radix(radix),
-                           self.im.to_str_radix(radix))
+            format!("{}+{}i",
+                    self.re.to_str_radix(radix),
+                    self.im.to_str_radix(radix))
         }
     }
 }
diff --git a/src/libnum/rational.rs b/src/libnum/rational.rs
index e916265396e..ba0a571268f 100644
--- a/src/libnum/rational.rs
+++ b/src/libnum/rational.rs
@@ -282,9 +282,9 @@ impl<T: fmt::Show> fmt::Show for Ratio<T> {
 impl<T: ToStrRadix> ToStrRadix for Ratio<T> {
     /// Renders as `numer/denom` where the numbers are in base `radix`.
     fn to_str_radix(&self, radix: uint) -> String {
-        format_strbuf!("{}/{}",
-                       self.numer.to_str_radix(radix),
-                       self.denom.to_str_radix(radix))
+        format!("{}/{}",
+                self.numer.to_str_radix(radix),
+                self.denom.to_str_radix(radix))
     }
 }
 
diff --git a/src/libregex/re.rs b/src/libregex/re.rs
index 5958089a8a4..83c1cb37158 100644
--- a/src/libregex/re.rs
+++ b/src/libregex/re.rs
@@ -425,7 +425,7 @@ impl Regex {
     /// # use regex::Captures; fn main() {
     /// let re = regex!(r"([^,\s]+),\s+(\S+)");
     /// let result = re.replace("Springsteen, Bruce", |caps: &Captures| {
-    ///     format_strbuf!("{} {}", caps.at(2), caps.at(1))
+    ///     format!("{} {}", caps.at(2), caps.at(1))
     /// });
     /// assert_eq!(result.as_slice(), "Bruce Springsteen");
     /// # }
@@ -761,9 +761,8 @@ impl<'t> Captures<'t> {
         let re = Regex::new(r"(^|[^$]|\b)\$(\w+)").unwrap();
         let text = re.replace_all(text, |refs: &Captures| -> String {
             let (pre, name) = (refs.at(1), refs.at(2));
-            format_strbuf!("{}{}",
-                           pre,
-                           match from_str::<uint>(name.as_slice()) {
+            format!("{}{}", pre,
+                    match from_str::<uint>(name.as_slice()) {
                 None => self.name(name).to_string(),
                 Some(i) => self.at(i).to_string(),
             })
diff --git a/src/librustc/back/archive.rs b/src/librustc/back/archive.rs
index 82cda6f13f1..1c60e4fbe92 100644
--- a/src/librustc/back/archive.rs
+++ b/src/librustc/back/archive.rs
@@ -165,7 +165,7 @@ impl<'a> Archive<'a> {
             if skip.iter().any(|s| *s == filename) { continue }
             if filename.contains(".SYMDEF") { continue }
 
-            let filename = format_strbuf!("r-{}-{}", name, filename);
+            let filename = format!("r-{}-{}", name, filename);
             let new_filename = file.with_filename(filename);
             try!(fs::rename(file, &new_filename));
             inputs.push(new_filename);
@@ -185,8 +185,8 @@ impl<'a> Archive<'a> {
         };
         // On Windows, static libraries sometimes show up as libfoo.a and other
         // times show up as foo.lib
-        let oslibname = format_strbuf!("{}{}.{}", osprefix, name, osext);
-        let unixlibname = format_strbuf!("lib{}.a", name);
+        let oslibname = format!("{}{}.{}", osprefix, name, osext);
+        let unixlibname = format!("lib{}.a", name);
 
         let mut rustpath = filesearch::rust_path();
         rustpath.push(self.sess.target_filesearch().get_lib_path());
diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs
index 2baf8c24697..05a366c1d32 100644
--- a/src/librustc/back/link.rs
+++ b/src/librustc/back/link.rs
@@ -751,10 +751,7 @@ pub fn mangle_internal_name_by_path_and_seq(path: PathElems, flav: &str) -> Stri
 }
 
 pub fn output_lib_filename(id: &CrateId) -> String {
-    format_strbuf!("{}-{}-{}",
-                   id.name,
-                   crate_id_hash(id),
-                   id.version_or_default())
+    format!("{}-{}-{}", id.name, crate_id_hash(id), id.version_or_default())
 }
 
 pub fn get_cc_prog(sess: &Session) -> String {
@@ -827,7 +824,7 @@ pub fn filename_for_input(sess: &Session, crate_type: config::CrateType,
     let libname = output_lib_filename(id);
     match crate_type {
         config::CrateTypeRlib => {
-            out_filename.with_filename(format_strbuf!("lib{}.rlib", libname))
+            out_filename.with_filename(format!("lib{}.rlib", libname))
         }
         config::CrateTypeDylib => {
             let (prefix, suffix) = match sess.targ_cfg.os {
@@ -837,13 +834,11 @@ pub fn filename_for_input(sess: &Session, crate_type: config::CrateType,
                 abi::OsAndroid => (loader::ANDROID_DLL_PREFIX, loader::ANDROID_DLL_SUFFIX),
                 abi::OsFreebsd => (loader::FREEBSD_DLL_PREFIX, loader::FREEBSD_DLL_SUFFIX),
             };
-            out_filename.with_filename(format_strbuf!("{}{}{}",
-                                                      prefix,
-                                                      libname,
-                                                      suffix))
+            out_filename.with_filename(format!("{}{}{}", prefix, libname,
+                                               suffix))
         }
         config::CrateTypeStaticlib => {
-            out_filename.with_filename(format_strbuf!("lib{}.a", libname))
+            out_filename.with_filename(format!("lib{}.a", libname))
         }
         config::CrateTypeExecutable => out_filename.clone(),
     }
@@ -1350,7 +1345,7 @@ fn add_local_native_libraries(cmd: &mut Command, sess: &Session) {
                         cmd.arg("-Wl,-Bdynamic");
                     }
                 }
-                cmd.arg(format_strbuf!("-l{}", *l));
+                cmd.arg(format!("-l{}", *l));
             }
             cstore::NativeFramework => {
                 cmd.arg("-framework");
@@ -1514,7 +1509,7 @@ fn add_upstream_native_libraries(cmd: &mut Command, sess: &Session) {
         for &(kind, ref lib) in libs.iter() {
             match kind {
                 cstore::NativeUnknown => {
-                    cmd.arg(format_strbuf!("-l{}", *lib));
+                    cmd.arg(format!("-l{}", *lib));
                 }
                 cstore::NativeFramework => {
                     cmd.arg("-framework");
diff --git a/src/librustc/back/lto.rs b/src/librustc/back/lto.rs
index 372d66003f2..09dfc918967 100644
--- a/src/librustc/back/lto.rs
+++ b/src/librustc/back/lto.rs
@@ -85,8 +85,8 @@ pub fn run(sess: &session::Session, llmod: ModuleRef,
                                                     ptr as *libc::c_char,
                                                     bc.len() as libc::size_t) {
                 link::llvm_err(sess,
-                               format_strbuf!("failed to load bc of `{}`",
-                                               name.as_slice()));
+                               format!("failed to load bc of `{}`",
+                                       name.as_slice()));
             }
         });
     }
diff --git a/src/librustc/driver/driver.rs b/src/librustc/driver/driver.rs
index bc0d8e2f75c..d04df996186 100644
--- a/src/librustc/driver/driver.rs
+++ b/src/librustc/driver/driver.rs
@@ -653,14 +653,14 @@ pub fn pretty_print_input(sess: Session,
         PpmFlowGraph(nodeid) => {
             let ast_map = ast_map.expect("--pretty flowgraph missing ast_map");
             let node = ast_map.find(nodeid).unwrap_or_else(|| {
-                sess.fatal(format_strbuf!("--pretty flowgraph couldn't find id: {}",
-                                          nodeid).as_slice())
+                sess.fatal(format!("--pretty flowgraph couldn't find id: {}",
+                                   nodeid).as_slice())
             });
             let block = match node {
                 syntax::ast_map::NodeBlock(block) => block,
                 _ => {
-                    let message = format_strbuf!("--pretty=flowgraph needs block, got {:?}",
-                                                 node);
+                    let message = format!("--pretty=flowgraph needs block, got {:?}",
+                                          node);
 
                     // point to what was found, if there's an
                     // accessible span.
@@ -706,7 +706,7 @@ fn print_flowgraph<W:io::Writer>(analysis: CrateAnalysis,
             io::IoError {
                 detail: Some(match orig_detail {
                     None => m.into_string(),
-                    Some(d) => format_strbuf!("{}: {}", m, d)
+                    Some(d) => format!("{}: {}", m, d)
                 }),
                 ..ioerr
             }
diff --git a/src/librustc/lib/llvm.rs b/src/librustc/lib/llvm.rs
index 781720277a9..95a2c558836 100644
--- a/src/librustc/lib/llvm.rs
+++ b/src/librustc/lib/llvm.rs
@@ -1892,7 +1892,7 @@ impl TypeNames {
 
     pub fn types_to_str(&self, tys: &[Type]) -> String {
         let strs: Vec<String> = tys.iter().map(|t| self.type_to_str(*t)).collect();
-        format_strbuf!("[{}]", strs.connect(",").to_string())
+        format!("[{}]", strs.connect(",").to_string())
     }
 
     pub fn val_to_str(&self, val: ValueRef) -> String {
diff --git a/src/librustc/metadata/encoder.rs b/src/librustc/metadata/encoder.rs
index 60562e55ce6..4012bbfef75 100644
--- a/src/librustc/metadata/encoder.rs
+++ b/src/librustc/metadata/encoder.rs
@@ -140,7 +140,7 @@ fn encode_family(ebml_w: &mut Encoder, c: char) {
 }
 
 pub fn def_to_str(did: DefId) -> String {
-    format_strbuf!("{}:{}", did.krate, did.node)
+    format!("{}:{}", did.krate, did.node)
 }
 
 fn encode_ty_type_param_defs(ebml_w: &mut Encoder,
diff --git a/src/librustc/metadata/loader.rs b/src/librustc/metadata/loader.rs
index 5cc8d9f7a15..471240f10af 100644
--- a/src/librustc/metadata/loader.rs
+++ b/src/librustc/metadata/loader.rs
@@ -506,7 +506,7 @@ fn get_metadata_section(os: Os, filename: &Path) -> Result<MetadataBlob, String>
 
 fn get_metadata_section_imp(os: Os, filename: &Path) -> Result<MetadataBlob, String> {
     if !filename.exists() {
-        return Err(format_strbuf!("no such file: '{}'", filename.display()));
+        return Err(format!("no such file: '{}'", filename.display()));
     }
     if filename.filename_str().unwrap().ends_with(".rlib") {
         // Use ArchiveRO for speed here, it's backed by LLVM and uses mmap
@@ -516,16 +516,14 @@ fn get_metadata_section_imp(os: Os, filename: &Path) -> Result<MetadataBlob, Str
             Some(ar) => ar,
             None => {
                 debug!("llvm didn't like `{}`", filename.display());
-                return Err(format_strbuf!("failed to read rlib metadata: \
-                                           '{}'",
-                                          filename.display()));
+                return Err(format!("failed to read rlib metadata: '{}'",
+                                   filename.display()));
             }
         };
         return match ArchiveMetadata::new(archive).map(|ar| MetadataArchive(ar)) {
             None => {
-                return Err((format_strbuf!("failed to read rlib metadata: \
-                                            '{}'",
-                                           filename.display())))
+                return Err((format!("failed to read rlib metadata: '{}'",
+                                    filename.display())))
             }
             Some(blob) => return Ok(blob)
         }
@@ -535,15 +533,14 @@ fn get_metadata_section_imp(os: Os, filename: &Path) -> Result<MetadataBlob, Str
             llvm::LLVMRustCreateMemoryBufferWithContentsOfFile(buf)
         });
         if mb as int == 0 {
-            return Err(format_strbuf!("error reading library: '{}'",
-                                      filename.display()))
+            return Err(format!("error reading library: '{}'",
+                               filename.display()))
         }
         let of = match ObjectFile::new(mb) {
             Some(of) => of,
             _ => {
-                return Err((format_strbuf!("provided path not an object \
-                                            file: '{}'",
-                                           filename.display())))
+                return Err((format!("provided path not an object file: '{}'",
+                                    filename.display())))
             }
         };
         let si = mk_section_iter(of.llof);
@@ -556,8 +553,7 @@ fn get_metadata_section_imp(os: Os, filename: &Path) -> Result<MetadataBlob, Str
                 let cbuf = llvm::LLVMGetSectionContents(si.llsi);
                 let csz = llvm::LLVMGetSectionSize(si.llsi) as uint;
                 let mut found =
-                    Err(format_strbuf!("metadata not found: '{}'",
-                                       filename.display()));
+                    Err(format!("metadata not found: '{}'", filename.display()));
                 let cvbuf: *u8 = mem::transmute(cbuf);
                 let vlen = encoder::metadata_encoding_version.len();
                 debug!("checking {} bytes of metadata-version stamp",
@@ -566,8 +562,7 @@ fn get_metadata_section_imp(os: Os, filename: &Path) -> Result<MetadataBlob, Str
                 let version_ok = slice::raw::buf_as_slice(cvbuf, minsz,
                     |buf0| buf0 == encoder::metadata_encoding_version);
                 if !version_ok {
-                    return Err((format_strbuf!("incompatible metadata \
-                                                version found: '{}'",
+                    return Err((format!("incompatible metadata version found: '{}'",
                                         filename.display())));
                 }
 
@@ -579,9 +574,9 @@ fn get_metadata_section_imp(os: Os, filename: &Path) -> Result<MetadataBlob, Str
                         Some(inflated) => found = Ok(MetadataVec(inflated)),
                         None => {
                             found =
-                                Err(format_strbuf!("failed to decompress \
-                                                    metadata for: '{}'",
-                                                   filename.display()))
+                                Err(format!("failed to decompress \
+                                             metadata for: '{}'",
+                                            filename.display()))
                         }
                     }
                 });
@@ -591,8 +586,7 @@ fn get_metadata_section_imp(os: Os, filename: &Path) -> Result<MetadataBlob, Str
             }
             llvm::LLVMMoveToNextSection(si.llsi);
         }
-        return Err(format_strbuf!("metadata not found: '{}'",
-                                  filename.display()));
+        return Err(format!("metadata not found: '{}'", filename.display()));
     }
 }
 
diff --git a/src/librustc/metadata/tyencode.rs b/src/librustc/metadata/tyencode.rs
index 1b0e2469b05..aa8a8998e2b 100644
--- a/src/librustc/metadata/tyencode.rs
+++ b/src/librustc/metadata/tyencode.rs
@@ -69,7 +69,7 @@ pub fn enc_ty(w: &mut MemWriter, cx: &ctxt, t: ty::t) {
         cx.abbrevs.borrow_mut().insert(t, ty_abbrev {
             pos: pos as uint,
             len: len as uint,
-            s: format_strbuf!("\\#{:x}:{:x}\\#", pos, len)
+            s: format!("\\#{:x}:{:x}\\#", pos, len)
         });
     }
 }
diff --git a/src/librustc/middle/borrowck/mod.rs b/src/librustc/middle/borrowck/mod.rs
index 5dd988a82ce..e52d8ba3975 100644
--- a/src/librustc/middle/borrowck/mod.rs
+++ b/src/librustc/middle/borrowck/mod.rs
@@ -94,7 +94,7 @@ pub fn check_crate(tcx: &ty::ctxt,
     fn make_stat(bccx: &BorrowckCtxt, stat: uint) -> String {
         let stat_f = stat as f64;
         let total = bccx.stats.guaranteed_paths.get() as f64;
-        format_strbuf!("{} ({:.0f}%)", stat  , stat_f * 100.0 / total)
+        format!("{} ({:.0f}%)", stat  , stat_f * 100.0 / total)
     }
 }
 
@@ -297,7 +297,7 @@ impl BitAnd<RestrictionSet,RestrictionSet> for RestrictionSet {
 
 impl Repr for RestrictionSet {
     fn repr(&self, _tcx: &ty::ctxt) -> String {
-        format_strbuf!("RestrictionSet(0x{:x})", self.bits as uint)
+        format!("RestrictionSet(0x{:x})", self.bits as uint)
     }
 }
 
@@ -579,27 +579,27 @@ impl<'a> BorrowckCtxt<'a> {
             err_mutbl => {
                 let descr = match opt_loan_path(&err.cmt) {
                     None => {
-                        format_strbuf!("{} {}",
-                                       err.cmt.mutbl.to_user_str(),
-                                       self.cmt_to_str(&*err.cmt))
+                        format!("{} {}",
+                                err.cmt.mutbl.to_user_str(),
+                                self.cmt_to_str(&*err.cmt))
                     }
                     Some(lp) => {
-                        format_strbuf!("{} {} `{}`",
-                                       err.cmt.mutbl.to_user_str(),
-                                       self.cmt_to_str(&*err.cmt),
-                                       self.loan_path_to_str(&*lp))
+                        format!("{} {} `{}`",
+                                err.cmt.mutbl.to_user_str(),
+                                self.cmt_to_str(&*err.cmt),
+                                self.loan_path_to_str(&*lp))
                     }
                 };
 
                 match err.cause {
                     euv::ClosureCapture(_) => {
-                        format_strbuf!("closure cannot assign to {}", descr)
+                        format!("closure cannot assign to {}", descr)
                     }
                     euv::OverloadedOperator |
                     euv::AddrOf |
                     euv::RefBinding |
                     euv::AutoRef => {
-                        format_strbuf!("cannot borrow {} as mutable", descr)
+                        format!("cannot borrow {} as mutable", descr)
                     }
                     euv::ClosureInvocation => {
                         self.tcx.sess.span_bug(err.span,
@@ -611,20 +611,20 @@ impl<'a> BorrowckCtxt<'a> {
                 let msg = match opt_loan_path(&err.cmt) {
                     None => "borrowed value".to_string(),
                     Some(lp) => {
-                        format_strbuf!("`{}`", self.loan_path_to_str(&*lp))
+                        format!("`{}`", self.loan_path_to_str(&*lp))
                     }
                 };
-                format_strbuf!("{} does not live long enough", msg)
+                format!("{} does not live long enough", msg)
             }
             err_borrowed_pointer_too_short(..) => {
                 let descr = match opt_loan_path(&err.cmt) {
                     Some(lp) => {
-                        format_strbuf!("`{}`", self.loan_path_to_str(&*lp))
+                        format!("`{}`", self.loan_path_to_str(&*lp))
                     }
                     None => self.cmt_to_str(&*err.cmt),
                 };
 
-                format_strbuf!("lifetime of {} is too short to guarantee \
+                format!("lifetime of {} is too short to guarantee \
                                 its contents can be safely reborrowed",
                                descr)
             }
@@ -713,7 +713,7 @@ impl<'a> BorrowckCtxt<'a> {
             err_borrowed_pointer_too_short(loan_scope, ptr_scope, _) => {
                 let descr = match opt_loan_path(&err.cmt) {
                     Some(lp) => {
-                        format_strbuf!("`{}`", self.loan_path_to_str(&*lp))
+                        format!("`{}`", self.loan_path_to_str(&*lp))
                     }
                     None => self.cmt_to_str(&*err.cmt),
                 };
diff --git a/src/librustc/middle/check_match.rs b/src/librustc/middle/check_match.rs
index ffc9ee7ec76..a6108cbe62e 100644
--- a/src/librustc/middle/check_match.rs
+++ b/src/librustc/middle/check_match.rs
@@ -190,7 +190,7 @@ fn check_exhaustive(cx: &MatchCheckCtxt, sp: Span, pats: Vec<@Pat> ) {
                 ty::ty_vec(..) | ty::ty_rptr(..) => {
                     match *ctor {
                         vec(n) => {
-                            Some(format_strbuf!("vectors of length {}", n))
+                            Some(format!("vectors of length {}", n))
                         }
                         _ => None
                     }
@@ -199,8 +199,8 @@ fn check_exhaustive(cx: &MatchCheckCtxt, sp: Span, pats: Vec<@Pat> ) {
             }
         }
     };
-    let msg = format_strbuf!("non-exhaustive patterns{}", match ext {
-        Some(ref s) => format_strbuf!(": {} not covered", *s),
+    let msg = format!("non-exhaustive patterns{}", match ext {
+        Some(ref s) => format!(": {} not covered", *s),
         None => "".to_string()
     });
     cx.tcx.sess.span_err(sp, msg.as_slice());
diff --git a/src/librustc/middle/check_static.rs b/src/librustc/middle/check_static.rs
index 4bf56ad11e3..42510f58a14 100644
--- a/src/librustc/middle/check_static.rs
+++ b/src/librustc/middle/check_static.rs
@@ -49,8 +49,7 @@ fn safe_type_for_static_mut(cx: &ty::ctxt, e: &ast::Expr) -> Option<String> {
         return None;
     };
 
-    Some(format_strbuf!("mutable static items are not allowed to have {}",
-                        suffix))
+    Some(format!("mutable static items are not allowed to have {}", suffix))
 }
 
 struct CheckStaticVisitor<'a> {
diff --git a/src/librustc/middle/dataflow.rs b/src/librustc/middle/dataflow.rs
index 91c1c0bcf9f..30792da84e0 100644
--- a/src/librustc/middle/dataflow.rs
+++ b/src/librustc/middle/dataflow.rs
@@ -112,11 +112,8 @@ impl<'a, O:DataFlowOperator> pprust::PpAnn for DataFlowContext<'a, O> {
                 "".to_string()
             };
 
-            try!(ps.synth_comment(format_strbuf!("id {}: {}{}{}",
-                                                 id,
-                                                 entry_str,
-                                                 gens_str,
-                                                 kills_str)));
+            try!(ps.synth_comment(format!("id {}: {}{}{}", id, entry_str,
+                                          gens_str, kills_str)));
             try!(pp::space(&mut ps.s));
         }
         Ok(())
@@ -895,5 +892,5 @@ fn set_bit(words: &mut [uint], bit: uint) -> bool {
 fn bit_str(bit: uint) -> String {
     let byte = bit >> 8;
     let lobits = 1 << (bit & 0xFF);
-    format_strbuf!("[{}:{}-{:02x}]", bit, byte, lobits)
+    format!("[{}:{}-{:02x}]", bit, byte, lobits)
 }
diff --git a/src/librustc/middle/dead.rs b/src/librustc/middle/dead.rs
index 5d26947bee3..7bdcb679a59 100644
--- a/src/librustc/middle/dead.rs
+++ b/src/librustc/middle/dead.rs
@@ -361,8 +361,8 @@ impl<'a> DeadVisitor<'a> {
             .add_lint(DeadCode,
                       id,
                       span,
-                      format_strbuf!("code is never used: `{}`",
-                                     token::get_ident(ident)));
+                      format!("code is never used: `{}`",
+                              token::get_ident(ident)));
     }
 }
 
diff --git a/src/librustc/middle/lang_items.rs b/src/librustc/middle/lang_items.rs
index 3f00950f4cd..f80c325496d 100644
--- a/src/librustc/middle/lang_items.rs
+++ b/src/librustc/middle/lang_items.rs
@@ -78,8 +78,8 @@ impl LanguageItems {
         match self.items.get(it as uint) {
             &Some(id) => Ok(id),
             &None => {
-                Err(format_strbuf!("requires `{}` lang_item",
-                                   LanguageItems::item_name(it as uint)))
+                Err(format!("requires `{}` lang_item",
+                            LanguageItems::item_name(it as uint)))
             }
         }
     }
diff --git a/src/librustc/middle/liveness.rs b/src/librustc/middle/liveness.rs
index 5759a1005f0..beb522802fe 100644
--- a/src/librustc/middle/liveness.rs
+++ b/src/librustc/middle/liveness.rs
@@ -154,13 +154,13 @@ fn live_node_kind_to_str(lnk: LiveNodeKind, cx: &ty::ctxt) -> String {
     let cm = cx.sess.codemap();
     match lnk {
         FreeVarNode(s) => {
-            format_strbuf!("Free var node [{}]", cm.span_to_str(s))
+            format!("Free var node [{}]", cm.span_to_str(s))
         }
         ExprNode(s) => {
-            format_strbuf!("Expr node [{}]", cm.span_to_str(s))
+            format!("Expr node [{}]", cm.span_to_str(s))
         }
         VarDefNode(s) => {
-            format_strbuf!("Var def node [{}]", cm.span_to_str(s))
+            format!("Var def node [{}]", cm.span_to_str(s))
         }
         ExitNode => "Exit node".to_string(),
     }
@@ -1594,12 +1594,11 @@ impl<'a> Liveness<'a> {
 
                 if is_assigned {
                     self.ir.tcx.sess.add_lint(UnusedVariable, id, sp,
-                        format_strbuf!("variable `{}` is assigned to, \
-                                        but never used",
-                                       *name));
+                        format!("variable `{}` is assigned to, but never used",
+                                *name));
                 } else {
                     self.ir.tcx.sess.add_lint(UnusedVariable, id, sp,
-                        format_strbuf!("unused variable: `{}`", *name));
+                        format!("unused variable: `{}`", *name));
                 }
             }
             true
@@ -1617,8 +1616,7 @@ impl<'a> Liveness<'a> {
             let r = self.should_warn(var);
             for name in r.iter() {
                 self.ir.tcx.sess.add_lint(DeadAssignment, id, sp,
-                    format_strbuf!("value assigned to `{}` is never read",
-                                   *name));
+                    format!("value assigned to `{}` is never read", *name));
             }
         }
     }
diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index 5787657d639..3aea6e4b552 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -1116,8 +1116,7 @@ impl<'t,TYPER:Typer> MemCategorizationContext<'t,TYPER> {
                       "captured outer variable".to_string()
                   }
                   _ => {
-                      format_strbuf!("dereference of `{}`-pointer",
-                                     ptr_sigil(pk))
+                      format!("dereference of `{}`-pointer", ptr_sigil(pk))
                   }
               }
           }
@@ -1250,11 +1249,11 @@ impl cmt_ {
 
 impl Repr for cmt_ {
     fn repr(&self, tcx: &ty::ctxt) -> String {
-        format_strbuf!("\\{{} id:{} m:{:?} ty:{}\\}",
-                       self.cat.repr(tcx),
-                       self.id,
-                       self.mutbl,
-                       self.ty.repr(tcx))
+        format!("\\{{} id:{} m:{:?} ty:{}\\}",
+                self.cat.repr(tcx),
+                self.id,
+                self.mutbl,
+                self.ty.repr(tcx))
     }
 }
 
@@ -1267,19 +1266,16 @@ impl Repr for categorization {
             cat_local(..) |
             cat_upvar(..) |
             cat_arg(..) => {
-                format_strbuf!("{:?}", *self)
+                format!("{:?}", *self)
             }
             cat_deref(ref cmt, derefs, ptr) => {
-                format_strbuf!("{}-{}{}->",
-                               cmt.cat.repr(tcx),
-                               ptr_sigil(ptr),
-                               derefs)
+                format!("{}-{}{}->", cmt.cat.repr(tcx), ptr_sigil(ptr), derefs)
             }
             cat_interior(ref cmt, interior) => {
-                format_strbuf!("{}.{}", cmt.cat.repr(tcx), interior.repr(tcx))
+                format!("{}.{}", cmt.cat.repr(tcx), interior.repr(tcx))
             }
             cat_downcast(ref cmt) => {
-                format_strbuf!("{}->(enum)", cmt.cat.repr(tcx))
+                format!("{}->(enum)", cmt.cat.repr(tcx))
             }
             cat_discr(ref cmt, _) => {
                 cmt.cat.repr(tcx)
@@ -1305,7 +1301,7 @@ impl Repr for InteriorKind {
             InteriorField(NamedField(fld)) => {
                 token::get_name(fld).get().to_str().to_string()
             }
-            InteriorField(PositionalField(i)) => format_strbuf!("\\#{:?}", i),
+            InteriorField(PositionalField(i)) => format!("\\#{:?}", i),
             InteriorElement(_) => "[]".to_string(),
         }
     }
diff --git a/src/librustc/middle/privacy.rs b/src/librustc/middle/privacy.rs
index 1f2bb643b3c..5b47336efe5 100644
--- a/src/librustc/middle/privacy.rs
+++ b/src/librustc/middle/privacy.rs
@@ -547,9 +547,7 @@ impl<'a> PrivacyVisitor<'a> {
                      source_did: Option<ast::DefId>, msg: &str) -> CheckResult {
         let id = match self.def_privacy(to_check) {
             ExternallyDenied => {
-                return Some((span,
-                             format_strbuf!("{} is private", msg),
-                             None))
+                return Some((span, format!("{} is private", msg), None))
             }
             Allowable => return None,
             DisallowedBy(id) => id,
@@ -560,11 +558,9 @@ impl<'a> PrivacyVisitor<'a> {
         // because the item itself is private or because its parent is private
         // and its parent isn't in our ancestry.
         let (err_span, err_msg) = if id == source_did.unwrap_or(to_check).node {
-            return Some((span,
-                         format_strbuf!("{} is private", msg),
-                         None));
+            return Some((span, format!("{} is private", msg), None));
         } else {
-            (span, format_strbuf!("{} is inaccessible", msg))
+            (span, format!("{} is inaccessible", msg))
         };
         let item = match self.tcx.map.find(id) {
             Some(ast_map::NodeItem(item)) => {
@@ -600,9 +596,8 @@ impl<'a> PrivacyVisitor<'a> {
             ast::ItemEnum(..) => "enum",
             _ => return Some((err_span, err_msg, None))
         };
-        let msg = format_strbuf!("{} `{}` is private",
-                                 desc,
-                                 token::get_ident(item.ident));
+        let msg = format!("{} `{}` is private", desc,
+                          token::get_ident(item.ident));
         Some((err_span, err_msg, Some((span, msg))))
     }
 
diff --git a/src/librustc/middle/trans/_match.rs b/src/librustc/middle/trans/_match.rs
index a10b31e923b..bb4c8e5aedd 100644
--- a/src/librustc/middle/trans/_match.rs
+++ b/src/librustc/middle/trans/_match.rs
@@ -405,7 +405,7 @@ impl<'a, 'b> Repr for Match<'a, 'b> {
             // for many programs, this just take too long to serialize
             self.pats.repr(tcx)
         } else {
-            format_strbuf!("{} pats", self.pats.len())
+            format!("{} pats", self.pats.len())
         }
     }
 }
diff --git a/src/librustc/middle/trans/asm.rs b/src/librustc/middle/trans/asm.rs
index 140f60c1ea9..db19fa521ce 100644
--- a/src/librustc/middle/trans/asm.rs
+++ b/src/librustc/middle/trans/asm.rs
@@ -72,7 +72,7 @@ pub fn trans_inline_asm<'a>(bcx: &'a Block<'a>, ia: &ast::InlineAsm)
 
     let mut clobbers = getClobbers();
     if !ia.clobbers.get().is_empty() && !clobbers.is_empty() {
-        clobbers = format_strbuf!("{},{}", ia.clobbers.get(), clobbers);
+        clobbers = format!("{},{}", ia.clobbers.get(), clobbers);
     } else {
         clobbers.push_str(ia.clobbers.get());
     }
diff --git a/src/librustc/middle/trans/base.rs b/src/librustc/middle/trans/base.rs
index 77ce3b3249f..386ad66ebd6 100644
--- a/src/librustc/middle/trans/base.rs
+++ b/src/librustc/middle/trans/base.rs
@@ -698,10 +698,9 @@ pub fn iter_structural_ty<'r,
                   for variant in (*variants).iter() {
                       let variant_cx =
                           fcx.new_temp_block(
-                              format_strbuf!("enum-iter-variant-{}",
-                                             variant.disr_val
-                                                    .to_str()
-                                                    .as_slice()).as_slice());
+                              format!("enum-iter-variant-{}",
+                                      variant.disr_val.to_str().as_slice())
+                                     .as_slice());
                       match adt::trans_case(cx, &*repr, variant.disr_val) {
                           _match::single_result(r) => {
                               AddCase(llswitch, r.val, variant_cx.llbb)
diff --git a/src/librustc/middle/trans/cleanup.rs b/src/librustc/middle/trans/cleanup.rs
index 6aecbd2a17e..47d8ecec021 100644
--- a/src/librustc/middle/trans/cleanup.rs
+++ b/src/librustc/middle/trans/cleanup.rs
@@ -763,9 +763,9 @@ impl<'a> CleanupScope<'a> {
          */
 
         match self.kind {
-            CustomScopeKind => format_strbuf!("{}_custom_", prefix),
-            AstScopeKind(id) => format_strbuf!("{}_ast_{}_", prefix, id),
-            LoopScopeKind(id, _) => format_strbuf!("{}_loop_{}_", prefix, id),
+            CustomScopeKind => format!("{}_custom_", prefix),
+            AstScopeKind(id) => format!("{}_ast_{}_", prefix, id),
+            LoopScopeKind(id, _) => format!("{}_loop_{}_", prefix, id),
         }
     }
 }
diff --git a/src/librustc/middle/trans/closure.rs b/src/librustc/middle/trans/closure.rs
index 29ea9157126..9e8d6926f12 100644
--- a/src/librustc/middle/trans/closure.rs
+++ b/src/librustc/middle/trans/closure.rs
@@ -105,7 +105,7 @@ pub struct EnvValue {
 
 impl EnvValue {
     pub fn to_str(&self, ccx: &CrateContext) -> String {
-        format_strbuf!("{}({})", self.action, self.datum.to_str(ccx))
+        format!("{}({})", self.action, self.datum.to_str(ccx))
     }
 }
 
diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index 237c5e8711d..adee9d06d1d 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -195,7 +195,7 @@ impl param_substs {
 }
 
 fn param_substs_to_str(this: &param_substs, tcx: &ty::ctxt) -> String {
-    format_strbuf!("param_substs({})", this.substs.repr(tcx))
+    format!("param_substs({})", this.substs.repr(tcx))
 }
 
 impl Repr for param_substs {
@@ -478,7 +478,7 @@ impl<'a> Block<'a> {
 
     pub fn to_str(&self) -> String {
         let blk: *Block = self;
-        format_strbuf!("[block {}]", blk)
+        format!("[block {}]", blk)
     }
 }
 
diff --git a/src/librustc/middle/trans/datum.rs b/src/librustc/middle/trans/datum.rs
index 860c82cc9de..1e0d3e16ab1 100644
--- a/src/librustc/middle/trans/datum.rs
+++ b/src/librustc/middle/trans/datum.rs
@@ -625,10 +625,10 @@ impl<K:KindOps> Datum<K> {
 
     #[allow(dead_code)] // useful for debugging
     pub fn to_str(&self, ccx: &CrateContext) -> String {
-        format_strbuf!("Datum({}, {}, {:?})",
-                       ccx.tn.val_to_str(self.val),
-                       ty_to_str(ccx.tcx(), self.ty),
-                       self.kind)
+        format!("Datum({}, {}, {:?})",
+                ccx.tn.val_to_str(self.val),
+                ty_to_str(ccx.tcx(), self.ty),
+                self.kind)
     }
 
     pub fn appropriate_rvalue_mode(&self, ccx: &CrateContext) -> RvalueMode {
diff --git a/src/librustc/middle/trans/debuginfo.rs b/src/librustc/middle/trans/debuginfo.rs
index 225c3c48cf4..c1d63286b21 100644
--- a/src/librustc/middle/trans/debuginfo.rs
+++ b/src/librustc/middle/trans/debuginfo.rs
@@ -2342,9 +2342,8 @@ fn cache_id_for_type(t: ty::t) -> uint {
 fn generate_unique_type_id(prefix: &'static str) -> String {
     unsafe {
         static mut unique_id_counter: atomics::AtomicUint = atomics::INIT_ATOMIC_UINT;
-        format_strbuf!("{}{}",
-                       prefix,
-                       unique_id_counter.fetch_add(1, atomics::SeqCst))
+        format!("{}{}", prefix,
+                unique_id_counter.fetch_add(1, atomics::SeqCst))
     }
 }
 
diff --git a/src/librustc/middle/trans/expr.rs b/src/librustc/middle/trans/expr.rs
index f254422226f..b551b9b1fd7 100644
--- a/src/librustc/middle/trans/expr.rs
+++ b/src/librustc/middle/trans/expr.rs
@@ -88,7 +88,7 @@ pub enum Dest {
 impl Dest {
     pub fn to_str(&self, ccx: &CrateContext) -> String {
         match *self {
-            SaveIn(v) => format_strbuf!("SaveIn({})", ccx.tn.val_to_str(v)),
+            SaveIn(v) => format!("SaveIn({})", ccx.tn.val_to_str(v)),
             Ignore => "Ignore".to_string()
         }
     }
diff --git a/src/librustc/middle/trans/glue.rs b/src/librustc/middle/trans/glue.rs
index 6d269756931..80ccf810e5a 100644
--- a/src/librustc/middle/trans/glue.rs
+++ b/src/librustc/middle/trans/glue.rs
@@ -474,9 +474,7 @@ fn make_generic_glue(ccx: &CrateContext,
                      name: &str)
                      -> ValueRef {
     let _icx = push_ctxt("make_generic_glue");
-    let glue_name = format_strbuf!("glue {} {}",
-                                   name,
-                                   ty_to_short_str(ccx.tcx(), t));
+    let glue_name = format!("glue {} {}", name, ty_to_short_str(ccx.tcx(), t));
     let _s = StatRecorder::new(ccx, glue_name);
 
     let arena = TypedArena::new();
diff --git a/src/librustc/middle/trans/llrepr.rs b/src/librustc/middle/trans/llrepr.rs
index 487749f9ecb..3cd1a59abef 100644
--- a/src/librustc/middle/trans/llrepr.rs
+++ b/src/librustc/middle/trans/llrepr.rs
@@ -19,7 +19,7 @@ pub trait LlvmRepr {
 impl<'a, T:LlvmRepr> LlvmRepr for &'a [T] {
     fn llrepr(&self, ccx: &CrateContext) -> String {
         let reprs: Vec<String> = self.iter().map(|t| t.llrepr(ccx)).collect();
-        format_strbuf!("[{}]", reprs.connect(","))
+        format!("[{}]", reprs.connect(","))
     }
 }
 
diff --git a/src/librustc/middle/trans/monomorphize.rs b/src/librustc/middle/trans/monomorphize.rs
index e0fd872fb06..f77cd0ee44d 100644
--- a/src/librustc/middle/trans/monomorphize.rs
+++ b/src/librustc/middle/trans/monomorphize.rs
@@ -109,10 +109,10 @@ pub fn monomorphic_fn(ccx: &CrateContext,
         ccx.sess(),
         ccx.tcx.map.find(fn_id.node),
         || {
-            format_strbuf!("while monomorphizing {:?}, couldn't find it in \
-                            the item map (may have attempted to monomorphize \
-                            an item defined in a different crate?)",
-                           fn_id)
+            format!("while monomorphizing {:?}, couldn't find it in \
+                     the item map (may have attempted to monomorphize \
+                     an item defined in a different crate?)",
+                    fn_id)
         });
 
     match map_node {
diff --git a/src/librustc/middle/trans/tvec.rs b/src/librustc/middle/trans/tvec.rs
index 4421c84e86f..446d2967139 100644
--- a/src/librustc/middle/trans/tvec.rs
+++ b/src/librustc/middle/trans/tvec.rs
@@ -74,12 +74,12 @@ pub struct VecTypes {
 
 impl VecTypes {
     pub fn to_str(&self, ccx: &CrateContext) -> String {
-        format_strbuf!("VecTypes \\{unit_ty={}, llunit_ty={}, \
-                        llunit_size={}, llunit_alloc_size={}\\}",
-                       ty_to_str(ccx.tcx(), self.unit_ty),
-                       ccx.tn.type_to_str(self.llunit_ty),
-                       ccx.tn.val_to_str(self.llunit_size),
-                       self.llunit_alloc_size)
+        format!("VecTypes \\{unit_ty={}, llunit_ty={}, \
+                 llunit_size={}, llunit_alloc_size={}\\}",
+                ty_to_str(ccx.tcx(), self.unit_ty),
+                ccx.tn.type_to_str(self.llunit_ty),
+                ccx.tn.val_to_str(self.llunit_size),
+                self.llunit_alloc_size)
     }
 }
 
diff --git a/src/librustc/middle/trans/type_of.rs b/src/librustc/middle/trans/type_of.rs
index f4fa5002fe9..0f28ce4d972 100644
--- a/src/librustc/middle/trans/type_of.rs
+++ b/src/librustc/middle/trans/type_of.rs
@@ -316,9 +316,9 @@ pub fn llvm_type_name(cx: &CrateContext,
                                     did,
                                     false);
     if did.krate == 0 {
-        format_strbuf!("{}.{}", name, tstr)
+        format!("{}.{}", name, tstr)
     } else {
-        format_strbuf!("{}.{}[\\#{}]", name, tstr, did.krate)
+        format!("{}.{}[\\#{}]", name, tstr, did.krate)
     }
 }
 
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index fe8db6fa8a1..07033d2bd4a 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -3236,7 +3236,7 @@ pub fn ty_sort_str(cx: &ctxt, t: t) -> String {
             ::util::ppaux::ty_to_str(cx, t)
         }
 
-        ty_enum(id, _) => format_strbuf!("enum {}", item_path_str(cx, id)),
+        ty_enum(id, _) => format!("enum {}", item_path_str(cx, id)),
         ty_box(_) => "@-ptr".to_string(),
         ty_uniq(_) => "box".to_string(),
         ty_vec(_, _) => "vector".to_string(),
@@ -3245,10 +3245,10 @@ pub fn ty_sort_str(cx: &ctxt, t: t) -> String {
         ty_bare_fn(_) => "extern fn".to_string(),
         ty_closure(_) => "fn".to_string(),
         ty_trait(ref inner) => {
-            format_strbuf!("trait {}", item_path_str(cx, inner.def_id))
+            format!("trait {}", item_path_str(cx, inner.def_id))
         }
         ty_struct(id, _) => {
-            format_strbuf!("struct {}", item_path_str(cx, id))
+            format!("struct {}", item_path_str(cx, id))
         }
         ty_tup(_) => "tuple".to_string(),
         ty_infer(TyVar(_)) => "inferred type".to_string(),
@@ -3280,24 +3280,24 @@ pub fn type_err_to_str(cx: &ctxt, err: &type_err) -> String {
     match *err {
         terr_mismatch => "types differ".to_string(),
         terr_fn_style_mismatch(values) => {
-            format_strbuf!("expected {} fn but found {} fn",
-                           values.expected.to_str(),
-                           values.found.to_str())
+            format!("expected {} fn but found {} fn",
+                    values.expected.to_str(),
+                    values.found.to_str())
         }
         terr_abi_mismatch(values) => {
-            format_strbuf!("expected {} fn but found {} fn",
-                           values.expected.to_str(),
-                           values.found.to_str())
+            format!("expected {} fn but found {} fn",
+                    values.expected.to_str(),
+                    values.found.to_str())
         }
         terr_onceness_mismatch(values) => {
-            format_strbuf!("expected {} fn but found {} fn",
-                           values.expected.to_str(),
-                           values.found.to_str())
+            format!("expected {} fn but found {} fn",
+                    values.expected.to_str(),
+                    values.found.to_str())
         }
         terr_sigil_mismatch(values) => {
-            format_strbuf!("expected {}, found {}",
-                           tstore_to_closure(&values.expected),
-                           tstore_to_closure(&values.found))
+            format!("expected {}, found {}",
+                    tstore_to_closure(&values.expected),
+                    tstore_to_closure(&values.found))
         }
         terr_mutability => "values differ in mutability".to_string(),
         terr_box_mutability => {
@@ -3307,31 +3307,31 @@ pub fn type_err_to_str(cx: &ctxt, err: &type_err) -> String {
         terr_ptr_mutability => "pointers differ in mutability".to_string(),
         terr_ref_mutability => "references differ in mutability".to_string(),
         terr_ty_param_size(values) => {
-            format_strbuf!("expected a type with {} type params \
-                            but found one with {} type params",
-                           values.expected,
-                           values.found)
+            format!("expected a type with {} type params \
+                     but found one with {} type params",
+                    values.expected,
+                    values.found)
         }
         terr_tuple_size(values) => {
-            format_strbuf!("expected a tuple with {} elements \
-                            but found one with {} elements",
-                           values.expected,
-                           values.found)
+            format!("expected a tuple with {} elements \
+                     but found one with {} elements",
+                    values.expected,
+                    values.found)
         }
         terr_record_size(values) => {
-            format_strbuf!("expected a record with {} fields \
-                            but found one with {} fields",
-                           values.expected,
-                           values.found)
+            format!("expected a record with {} fields \
+                     but found one with {} fields",
+                    values.expected,
+                    values.found)
         }
         terr_record_mutability => {
             "record elements differ in mutability".to_string()
         }
         terr_record_fields(values) => {
-            format_strbuf!("expected a record with field `{}` but found one \
-                            with field `{}`",
-                           token::get_ident(values.expected),
-                           token::get_ident(values.found))
+            format!("expected a record with field `{}` but found one \
+                     with field `{}`",
+                    token::get_ident(values.expected),
+                    token::get_ident(values.found))
         }
         terr_arg_count => {
             "incorrect number of function parameters".to_string()
@@ -3346,69 +3346,60 @@ pub fn type_err_to_str(cx: &ctxt, err: &type_err) -> String {
             "lifetimes do not intersect".to_string()
         }
         terr_regions_insufficiently_polymorphic(br, _) => {
-            format_strbuf!("expected bound lifetime parameter {}, \
-                            but found concrete lifetime",
-                           bound_region_ptr_to_str(cx, br))
+            format!("expected bound lifetime parameter {}, \
+                     but found concrete lifetime",
+                    bound_region_ptr_to_str(cx, br))
         }
         terr_regions_overly_polymorphic(br, _) => {
-            format_strbuf!("expected concrete lifetime, \
-                            but found bound lifetime parameter {}",
-                           bound_region_ptr_to_str(cx, br))
+            format!("expected concrete lifetime, \
+                     but found bound lifetime parameter {}",
+                    bound_region_ptr_to_str(cx, br))
         }
         terr_trait_stores_differ(_, ref values) => {
-            format_strbuf!("trait storage differs: expected `{}` but found \
-                            `{}`",
-                           trait_store_to_str(cx, (*values).expected),
-                           trait_store_to_str(cx, (*values).found))
+            format!("trait storage differs: expected `{}` but found `{}`",
+                    trait_store_to_str(cx, (*values).expected),
+                    trait_store_to_str(cx, (*values).found))
         }
         terr_sorts(values) => {
-            format_strbuf!("expected {} but found {}",
-                           ty_sort_str(cx, values.expected),
-                           ty_sort_str(cx, values.found))
+            format!("expected {} but found {}",
+                    ty_sort_str(cx, values.expected),
+                    ty_sort_str(cx, values.found))
         }
         terr_traits(values) => {
-            format_strbuf!("expected trait `{}` but found trait `{}`",
-                           item_path_str(cx, values.expected),
-                           item_path_str(cx, values.found))
+            format!("expected trait `{}` but found trait `{}`",
+                    item_path_str(cx, values.expected),
+                    item_path_str(cx, values.found))
         }
         terr_builtin_bounds(values) => {
             if values.expected.is_empty() {
-                format_strbuf!("expected no bounds but found `{}`",
-                               values.found.user_string(cx))
+                format!("expected no bounds but found `{}`",
+                        values.found.user_string(cx))
             } else if values.found.is_empty() {
-                format_strbuf!("expected bounds `{}` but found no bounds",
-                               values.expected.user_string(cx))
+                format!("expected bounds `{}` but found no bounds",
+                        values.expected.user_string(cx))
             } else {
-                format_strbuf!("expected bounds `{}` but found bounds `{}`",
-                               values.expected.user_string(cx),
-                               values.found.user_string(cx))
+                format!("expected bounds `{}` but found bounds `{}`",
+                        values.expected.user_string(cx),
+                        values.found.user_string(cx))
             }
         }
         terr_integer_as_char => {
             "expected an integral type but found `char`".to_string()
         }
         terr_int_mismatch(ref values) => {
-            format_strbuf!("expected `{}` but found `{}`",
-                           values.expected.to_str(),
-                           values.found.to_str())
+            format!("expected `{}` but found `{}`",
+                    values.expected.to_str(),
+                    values.found.to_str())
         }
         terr_float_mismatch(ref values) => {
-            format_strbuf!("expected `{}` but found `{}`",
-                           values.expected.to_str(),
-                           values.found.to_str())
+            format!("expected `{}` but found `{}`",
+                    values.expected.to_str(),
+                    values.found.to_str())
         }
         terr_variadic_mismatch(ref values) => {
-            format_strbuf!("expected {} fn but found {} function",
-                           if values.expected {
-                                "variadic"
-                           } else {
-                                "non-variadic"
-                           },
-                           if values.found {
-                               "variadic"
-                           } else {
-                               "non-variadic"
-                           })
+            format!("expected {} fn but found {} function",
+                    if values.expected { "variadic" } else { "non-variadic" },
+                    if values.found { "variadic" } else { "non-variadic" })
         }
     }
 }
diff --git a/src/librustc/middle/typeck/check/_match.rs b/src/librustc/middle/typeck/check/_match.rs
index 3d37de38e45..3d3d15baf84 100644
--- a/src/librustc/middle/typeck/check/_match.rs
+++ b/src/librustc/middle/typeck/check/_match.rs
@@ -167,10 +167,8 @@ pub fn check_pat_variant(pcx: &pat_ctxt, pat: &ast::Pat, path: &ast::Path,
                     fcx.infcx().type_error_message_str_with_expected(pat.span,
                                                        |expected, actual| {
                        expected.map_or("".to_string(), |e| {
-                        format_strbuf!("mismatched types: expected `{}` but \
-                                        found {}",
-                                       e,
-                                       actual)
+                        format!("mismatched types: expected `{}` but found {}",
+                                e, actual)
                         })},
                         Some(expected),
                         "a structure pattern".to_string(),
@@ -223,10 +221,8 @@ pub fn check_pat_variant(pcx: &pat_ctxt, pat: &ast::Pat, path: &ast::Path,
                                                |expected, actual| {
                                                expected.map_or("".to_string(),
                                                               |e| {
-                        format_strbuf!("mismatched types: expected `{}` but \
-                                        found {}",
-                                       e,
-                                       actual)
+                        format!("mismatched types: expected `{}` but found {}",
+                                e, actual)
                     })
                 },
                 Some(expected),
@@ -555,10 +551,8 @@ pub fn check_pat(pcx: &pat_ctxt, pat: &ast::Pat, expected: ty::t) {
                                                                 |expected, actual| {
                             expected.map_or("".to_string(),
                                             |e| {
-                                format_strbuf!("mismatched types: expected \
-                                                `{}` but found {}",
-                                               e,
-                                               actual)
+                                format!("mismatched types: expected \
+                                        `{}` but found {}", e, actual)
                             })},
                             Some(expected),
                             "a structure pattern".to_string(),
@@ -621,10 +615,8 @@ pub fn check_pat(pcx: &pat_ctxt, pat: &ast::Pat, expected: ty::t) {
                                                                  |expected,
                                                                   actual| {
                         expected.map_or("".to_string(), |e| {
-                            format_strbuf!("mismatched types: expected `{}` \
-                                            but found {}",
-                                           e,
-                                           actual)
+                            format!("mismatched types: expected `{}` \
+                                     but found {}", e, actual)
                         }
                     )},
                     Some(expected),
@@ -661,10 +653,8 @@ pub fn check_pat(pcx: &pat_ctxt, pat: &ast::Pat, expected: ty::t) {
                 |expected, actual| {
                     expected.map_or("".to_string(),
                                     |e| {
-                        format_strbuf!("mismatched types: expected `{}` but \
-                                        found {}",
-                                       e,
-                                       actual)
+                        format!("mismatched types: expected `{}` but found {}",
+                                e, actual)
                     })
                 },
                 Some(expected),
@@ -751,14 +741,12 @@ pub fn check_pointer_pat(pcx: &pat_ctxt,
                 span,
                 |expected, actual| {
                     expected.map_or("".to_string(), |e| {
-                        format_strbuf!("mismatched types: expected `{}` but \
-                                        found {}",
-                                       e,
-                                       actual)
+                        format!("mismatched types: expected `{}` but found {}",
+                                e, actual)
                     })
                 },
                 Some(expected),
-                format_strbuf!("{} pattern", match pointer_kind {
+                format!("{} pattern", match pointer_kind {
                     Send => "a box",
                     Borrowed => "an `&`-pointer",
                 }),
diff --git a/src/librustc/middle/typeck/check/method.rs b/src/librustc/middle/typeck/check/method.rs
index 6b3d026e0e5..ec2fa0dab55 100644
--- a/src/librustc/middle/typeck/check/method.rs
+++ b/src/librustc/middle/typeck/check/method.rs
@@ -1510,12 +1510,12 @@ impl<'a> LookupContext<'a> {
 
 impl Repr for Candidate {
     fn repr(&self, tcx: &ty::ctxt) -> String {
-        format_strbuf!("Candidate(rcvr_ty={}, rcvr_substs={}, method_ty={}, \
-                        origin={:?})",
-                       self.rcvr_match_condition.repr(tcx),
-                       self.rcvr_substs.repr(tcx),
-                       self.method_ty.repr(tcx),
-                       self.origin)
+        format!("Candidate(rcvr_ty={}, rcvr_substs={}, method_ty={}, \
+                 origin={:?})",
+                self.rcvr_match_condition.repr(tcx),
+                self.rcvr_substs.repr(tcx),
+                self.method_ty.repr(tcx),
+                self.origin)
     }
 }
 
@@ -1523,10 +1523,10 @@ impl Repr for RcvrMatchCondition {
     fn repr(&self, tcx: &ty::ctxt) -> String {
         match *self {
             RcvrMatchesIfObject(d) => {
-                format_strbuf!("RcvrMatchesIfObject({})", d.repr(tcx))
+                format!("RcvrMatchesIfObject({})", d.repr(tcx))
             }
             RcvrMatchesIfSubtype(t) => {
-                format_strbuf!("RcvrMatchesIfSubtype({})", t.repr(tcx))
+                format!("RcvrMatchesIfSubtype({})", t.repr(tcx))
             }
         }
     }
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index cdf8b50a1cd..f3881abead2 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -1101,7 +1101,7 @@ impl<'a> RegionScope for infer::InferCtxt<'a> {
 
 impl<'a> FnCtxt<'a> {
     pub fn tag(&self) -> String {
-        format_strbuf!("{}", self as *FnCtxt)
+        format!("{}", self as *FnCtxt)
     }
 
     pub fn local_ty(&self, span: Span, nid: ast::NodeId) -> ty::t {
@@ -1877,21 +1877,21 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                     ty::ty_float(ast::TyF32) => {
                         fcx.type_error_message(arg.span,
                                                |t| {
-                            format_strbuf!("can't pass an {} to variadic \
-                                            function, cast to c_double", t)
+                            format!("can't pass an {} to variadic \
+                                     function, cast to c_double", t)
                         }, arg_ty, None);
                     }
                     ty::ty_int(ast::TyI8) | ty::ty_int(ast::TyI16) | ty::ty_bool => {
                         fcx.type_error_message(arg.span, |t| {
-                            format_strbuf!("can't pass {} to variadic \
-                                            function, cast to c_int",
+                            format!("can't pass {} to variadic \
+                                     function, cast to c_int",
                                            t)
                         }, arg_ty, None);
                     }
                     ty::ty_uint(ast::TyU8) | ty::ty_uint(ast::TyU16) => {
                         fcx.type_error_message(arg.span, |t| {
-                            format_strbuf!("can't pass {} to variadic \
-                                            function, cast to c_uint",
+                            format!("can't pass {} to variadic \
+                                     function, cast to c_uint",
                                            t)
                         }, arg_ty, None);
                     }
@@ -1939,7 +1939,7 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
             ty::ty_closure(box ty::ClosureTy {sig: ref sig, ..}) => sig,
             _ => {
                 fcx.type_error_message(call_expr.span, |actual| {
-                    format_strbuf!("expected function but found `{}`", actual)
+                    format!("expected function but found `{}`", actual)
                 }, fn_ty, None);
                 &error_fn_sig
             }
@@ -1993,10 +1993,10 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
 
                 fcx.type_error_message(method_name.span,
                   |actual| {
-                      format_strbuf!("type `{}` does not implement any \
-                                      method in scope named `{}`",
-                                     actual,
-                                     token::get_ident(method_name.node))
+                      format!("type `{}` does not implement any \
+                               method in scope named `{}`",
+                              actual,
+                              token::get_ident(method_name.node))
                   },
                   expr_t,
                   None);
@@ -2148,12 +2148,12 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                         if ty::type_is_fp(ty::simd_type(tcx, lhs_t)) {
                             fcx.type_error_message(expr.span,
                                 |actual| {
-                                    format_strbuf!("binary comparison \
-                                                    operation `{}` not \
-                                                    supported for floating \
-                                                    point SIMD vector `{}`",
-                                                   ast_util::binop_to_str(op),
-                                                   actual)
+                                    format!("binary comparison \
+                                             operation `{}` not \
+                                             supported for floating \
+                                             point SIMD vector `{}`",
+                                            ast_util::binop_to_str(op),
+                                            actual)
                                 },
                                 lhs_t,
                                 None
@@ -2180,10 +2180,10 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
             fcx.write_error(rhs.id);
             fcx.type_error_message(expr.span,
                                    |actual| {
-                    format_strbuf!("binary operation `{}` cannot be applied \
-                                   to type `{}`",
-                                   ast_util::binop_to_str(op),
-                                   actual)
+                    format!("binary operation `{}` cannot be applied \
+                             to type `{}`",
+                            ast_util::binop_to_str(op),
+                            actual)
                 },
                 lhs_t,
                 None)
@@ -2195,12 +2195,12 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
         } else {
             fcx.type_error_message(expr.span,
                                    |actual| {
-                                        format_strbuf!("binary assignment \
-                                                        operation `{}=` \
-                                                        cannot be applied to \
-                                                        type `{}`",
-                                                 ast_util::binop_to_str(op),
-                                                 actual)
+                                        format!("binary assignment \
+                                                 operation `{}=` \
+                                                 cannot be applied to \
+                                                 type `{}`",
+                                                ast_util::binop_to_str(op),
+                                                actual)
                                    },
                                    lhs_t,
                                    None);
@@ -2247,10 +2247,9 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
         lookup_op_method(fcx, ex, lhs_resolved_t, token::intern(name),
                          trait_did, [lhs_expr, rhs], DontAutoderefReceiver, || {
             fcx.type_error_message(ex.span, |actual| {
-                format_strbuf!("binary operation `{}` cannot be applied to \
-                                type `{}`",
-                               ast_util::binop_to_str(op),
-                               actual)
+                format!("binary operation `{}` cannot be applied to type `{}`",
+                        ast_util::binop_to_str(op),
+                        actual)
             }, lhs_resolved_t, None)
         })
     }
@@ -2265,10 +2264,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
        lookup_op_method(fcx, ex, rhs_t, token::intern(mname),
                         trait_did, [rhs_expr], DontAutoderefReceiver, || {
             fcx.type_error_message(ex.span, |actual| {
-                format_strbuf!("cannot apply unary operator `{}` to type \
-                                `{}`",
-                               op_str,
-                               actual)
+                format!("cannot apply unary operator `{}` to type `{}`",
+                        op_str, actual)
             }, rhs_t, None);
         })
     }
@@ -2427,10 +2424,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                 fcx.type_error_message(
                     expr.span,
                     |actual| {
-                        format_strbuf!("attempted to take value of method \
-                                        `{}` on type `{}`",
-                                       token::get_name(field),
-                                       actual)
+                        format!("attempted to take value of method `{}` on type \
+                                 `{}`", token::get_name(field), actual)
                     },
                     expr_t, None);
 
@@ -2442,7 +2437,7 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                 fcx.type_error_message(
                     expr.span,
                     |actual| {
-                        format_strbuf!("attempted access of field `{}` on \
+                        format!("attempted access of field `{}` on \
                                         type `{}`, but no field with that \
                                         name was found",
                                        token::get_name(field),
@@ -2484,10 +2479,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                     fcx.type_error_message(
                       field.ident.span,
                       |actual| {
-                          format_strbuf!("structure `{}` has no field named \
-                                          `{}`",
-                                         actual,
-                                         token::get_ident(field.ident.node))
+                          format!("structure `{}` has no field named `{}`",
+                                  actual, token::get_ident(field.ident.node))
                       },
                       struct_ty,
                       None);
@@ -2876,9 +2869,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                                          no longer be dereferenced");
                                 } else {
                                     fcx.type_error_message(expr.span, |actual| {
-                                        format_strbuf!("type `{}` cannot be \
-                                                        dereferenced",
-                                                       actual)
+                                        format!("type `{}` cannot be \
+                                                dereferenced", actual)
                                     }, oprnd_t, None);
                                 }
                                 ty::mk_err()
@@ -3119,15 +3111,15 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                 _ => {
                     if ty::type_is_nil(t_e) {
                         fcx.type_error_message(expr.span, |actual| {
-                            format_strbuf!("cast from nil: `{}` as `{}`",
-                                           actual,
-                                           fcx.infcx().ty_to_str(t_1))
+                            format!("cast from nil: `{}` as `{}`",
+                                    actual,
+                                    fcx.infcx().ty_to_str(t_1))
                         }, t_e, None);
                     } else if ty::type_is_nil(t_1) {
                         fcx.type_error_message(expr.span, |actual| {
-                            format_strbuf!("cast to nil: `{}` as `{}`",
-                                           actual,
-                                           fcx.infcx().ty_to_str(t_1))
+                            format!("cast to nil: `{}` as `{}`",
+                                    actual,
+                                    fcx.infcx().ty_to_str(t_1))
                         }, t_e, None);
                     }
 
@@ -3147,9 +3139,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                         let te = fcx.infcx().resolve_type_vars_if_possible(te);
                         if ty::get(te).sty != ty::ty_uint(ast::TyU8) {
                             fcx.type_error_message(expr.span, |actual| {
-                                format_strbuf!("only `u8` can be cast as \
-                                                `char`, not `{}`",
-                                               actual)
+                                format!("only `u8` can be cast as \
+                                         `char`, not `{}`", actual)
                             }, t_e, None);
                         }
                     } else if ty::get(t1).sty == ty::ty_bool {
@@ -3211,9 +3202,9 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                         record the issue number in this comment.
                         */
                         fcx.type_error_message(expr.span, |actual| {
-                            format_strbuf!("non-scalar cast: `{}` as `{}`",
-                                           actual,
-                                           fcx.infcx().ty_to_str(t_1))
+                            format!("non-scalar cast: `{}` as `{}`",
+                                    actual,
+                                    fcx.infcx().ty_to_str(t_1))
                         }, t_e, None);
                     }
                 }
@@ -3332,12 +3323,9 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
                                                     || {
                         fcx.type_error_message(expr.span,
                                                |actual| {
-                                                    format_strbuf!("cannot \
-                                                                    index a \
-                                                                    value of \
-                                                                    type \
-                                                                    `{}`",
-                                                                    actual)
+                                                    format!("cannot index a \
+                                                             value of type \
+                                                             `{}`", actual)
                                                },
                                                base_t,
                                                None);
@@ -3364,9 +3352,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
 pub fn require_uint(fcx: &FnCtxt, sp: Span, t: ty::t) {
     if !type_is_uint(fcx, sp, t) {
         fcx.type_error_message(sp, |actual| {
-            format_strbuf!("mismatched types: expected `uint` type but found \
-                           `{}`",
-                           actual)
+            format!("mismatched types: expected `uint` type but found `{}`",
+                    actual)
         }, t, None);
     }
 }
@@ -3374,9 +3361,8 @@ pub fn require_uint(fcx: &FnCtxt, sp: Span, t: ty::t) {
 pub fn require_integral(fcx: &FnCtxt, sp: Span, t: ty::t) {
     if !type_is_integral(fcx, sp, t) {
         fcx.type_error_message(sp, |actual| {
-            format_strbuf!("mismatched types: expected integral type but \
-                            found `{}`",
-                           actual)
+            format!("mismatched types: expected integral type but found `{}`",
+                    actual)
         }, t, None);
     }
 }
@@ -4513,8 +4499,8 @@ pub fn check_intrinsic_type(ccx: &CrateCtxt, it: &ast::ForeignItem) {
                            i_ty.ty,
                            fty,
                            || {
-                format_strbuf!("intrinsic has wrong type: expected `{}`",
-                               ppaux::ty_to_str(ccx.tcx, fty))
+                format!("intrinsic has wrong type: expected `{}`",
+                        ppaux::ty_to_str(ccx.tcx, fty))
             });
     }
 }
diff --git a/src/librustc/middle/typeck/infer/error_reporting.rs b/src/librustc/middle/typeck/infer/error_reporting.rs
index d7e70205f5d..ec7f42313bb 100644
--- a/src/librustc/middle/typeck/infer/error_reporting.rs
+++ b/src/librustc/middle/typeck/infer/error_reporting.rs
@@ -395,9 +395,9 @@ impl<'a> ErrorReporting for InferCtxt<'a> {
             return None;
         }
 
-        Some(format_strbuf!("expected `{}` but found `{}`",
-                            expected.user_string(self.tcx),
-                            found.user_string(self.tcx)))
+        Some(format!("expected `{}` but found `{}`",
+                     expected.user_string(self.tcx),
+                     found.user_string(self.tcx)))
     }
 
     fn report_concrete_failure(&self,
diff --git a/src/librustc/middle/typeck/infer/mod.rs b/src/librustc/middle/typeck/infer/mod.rs
index 107c54115b4..e073d4fcbd7 100644
--- a/src/librustc/middle/typeck/infer/mod.rs
+++ b/src/librustc/middle/typeck/infer/mod.rs
@@ -252,10 +252,8 @@ pub fn fixup_err_to_str(f: fixup_err) -> String {
       cyclic_ty(_) => "cyclic type of infinite size".to_string(),
       unresolved_region(_) => "unconstrained region".to_string(),
       region_var_bound_by_region_var(r1, r2) => {
-        format_strbuf!("region var {:?} bound by another region var {:?}; \
-                        this is a bug in rustc",
-                       r1,
-                       r2)
+        format!("region var {:?} bound by another region var {:?}; \
+                 this is a bug in rustc", r1, r2)
       }
     }
 }
@@ -657,7 +655,7 @@ impl<'a> InferCtxt<'a> {
 
     pub fn tys_to_str(&self, ts: &[ty::t]) -> String {
         let tstrs: Vec<String> = ts.iter().map(|t| self.ty_to_str(*t)).collect();
-        format_strbuf!("({})", tstrs.connect(", "))
+        format!("({})", tstrs.connect(", "))
     }
 
     pub fn trait_ref_to_str(&self, t: &ty::TraitRef) -> String {
@@ -786,10 +784,9 @@ impl<'a> InferCtxt<'a> {
             _ => {
                 // if I leave out : String, it infers &str and complains
                 |actual: String| {
-                    format_strbuf!("mismatched types: expected `{}` but \
-                                    found `{}`",
-                                   self.ty_to_str(resolved_expected),
-                                   actual)
+                    format!("mismatched types: expected `{}` but found `{}`",
+                            self.ty_to_str(resolved_expected),
+                            actual)
                 }
             }
         };
@@ -830,7 +827,7 @@ impl TypeTrace {
 
 impl Repr for TypeTrace {
     fn repr(&self, tcx: &ty::ctxt) -> String {
-        format_strbuf!("TypeTrace({})", self.origin.repr(tcx))
+        format!("TypeTrace({})", self.origin.repr(tcx))
     }
 }
 
@@ -852,23 +849,23 @@ impl Repr for TypeOrigin {
     fn repr(&self, tcx: &ty::ctxt) -> String {
         match *self {
             MethodCompatCheck(a) => {
-                format_strbuf!("MethodCompatCheck({})", a.repr(tcx))
+                format!("MethodCompatCheck({})", a.repr(tcx))
             }
             ExprAssignable(a) => {
-                format_strbuf!("ExprAssignable({})", a.repr(tcx))
+                format!("ExprAssignable({})", a.repr(tcx))
             }
-            Misc(a) => format_strbuf!("Misc({})", a.repr(tcx)),
+            Misc(a) => format!("Misc({})", a.repr(tcx)),
             RelateTraitRefs(a) => {
-                format_strbuf!("RelateTraitRefs({})", a.repr(tcx))
+                format!("RelateTraitRefs({})", a.repr(tcx))
             }
             RelateSelfType(a) => {
-                format_strbuf!("RelateSelfType({})", a.repr(tcx))
+                format!("RelateSelfType({})", a.repr(tcx))
             }
             MatchExpression(a) => {
-                format_strbuf!("MatchExpression({})", a.repr(tcx))
+                format!("MatchExpression({})", a.repr(tcx))
             }
             IfExpression(a) => {
-                format_strbuf!("IfExpression({})", a.repr(tcx))
+                format!("IfExpression({})", a.repr(tcx))
             }
         }
     }
@@ -901,41 +898,41 @@ impl Repr for SubregionOrigin {
     fn repr(&self, tcx: &ty::ctxt) -> String {
         match *self {
             Subtype(ref a) => {
-                format_strbuf!("Subtype({})", a.repr(tcx))
+                format!("Subtype({})", a.repr(tcx))
             }
             InfStackClosure(a) => {
-                format_strbuf!("InfStackClosure({})", a.repr(tcx))
+                format!("InfStackClosure({})", a.repr(tcx))
             }
             InvokeClosure(a) => {
-                format_strbuf!("InvokeClosure({})", a.repr(tcx))
+                format!("InvokeClosure({})", a.repr(tcx))
             }
             DerefPointer(a) => {
-                format_strbuf!("DerefPointer({})", a.repr(tcx))
+                format!("DerefPointer({})", a.repr(tcx))
             }
             FreeVariable(a, b) => {
-                format_strbuf!("FreeVariable({}, {})", a.repr(tcx), b)
+                format!("FreeVariable({}, {})", a.repr(tcx), b)
             }
             IndexSlice(a) => {
-                format_strbuf!("IndexSlice({})", a.repr(tcx))
+                format!("IndexSlice({})", a.repr(tcx))
             }
             RelateObjectBound(a) => {
-                format_strbuf!("RelateObjectBound({})", a.repr(tcx))
+                format!("RelateObjectBound({})", a.repr(tcx))
             }
-            Reborrow(a) => format_strbuf!("Reborrow({})", a.repr(tcx)),
+            Reborrow(a) => format!("Reborrow({})", a.repr(tcx)),
             ReborrowUpvar(a, b) => {
-                format_strbuf!("ReborrowUpvar({},{:?})", a.repr(tcx), b)
+                format!("ReborrowUpvar({},{:?})", a.repr(tcx), b)
             }
             ReferenceOutlivesReferent(_, a) => {
-                format_strbuf!("ReferenceOutlivesReferent({})", a.repr(tcx))
+                format!("ReferenceOutlivesReferent({})", a.repr(tcx))
             }
             BindingTypeIsNotValidAtDecl(a) => {
-                format_strbuf!("BindingTypeIsNotValidAtDecl({})", a.repr(tcx))
+                format!("BindingTypeIsNotValidAtDecl({})", a.repr(tcx))
             }
-            CallRcvr(a) => format_strbuf!("CallRcvr({})", a.repr(tcx)),
-            CallArg(a) => format_strbuf!("CallArg({})", a.repr(tcx)),
-            CallReturn(a) => format_strbuf!("CallReturn({})", a.repr(tcx)),
-            AddrOf(a) => format_strbuf!("AddrOf({})", a.repr(tcx)),
-            AutoBorrow(a) => format_strbuf!("AutoBorrow({})", a.repr(tcx)),
+            CallRcvr(a) => format!("CallRcvr({})", a.repr(tcx)),
+            CallArg(a) => format!("CallArg({})", a.repr(tcx)),
+            CallReturn(a) => format!("CallReturn({})", a.repr(tcx)),
+            AddrOf(a) => format!("AddrOf({})", a.repr(tcx)),
+            AutoBorrow(a) => format!("AutoBorrow({})", a.repr(tcx)),
         }
     }
 }
@@ -962,39 +959,32 @@ impl Repr for RegionVariableOrigin {
     fn repr(&self, tcx: &ty::ctxt) -> String {
         match *self {
             MiscVariable(a) => {
-                format_strbuf!("MiscVariable({})", a.repr(tcx))
+                format!("MiscVariable({})", a.repr(tcx))
             }
             PatternRegion(a) => {
-                format_strbuf!("PatternRegion({})", a.repr(tcx))
+                format!("PatternRegion({})", a.repr(tcx))
             }
             AddrOfRegion(a) => {
-                format_strbuf!("AddrOfRegion({})", a.repr(tcx))
+                format!("AddrOfRegion({})", a.repr(tcx))
             }
-            AddrOfSlice(a) => format_strbuf!("AddrOfSlice({})", a.repr(tcx)),
-            Autoref(a) => format_strbuf!("Autoref({})", a.repr(tcx)),
-            Coercion(ref a) => format_strbuf!("Coercion({})", a.repr(tcx)),
+            AddrOfSlice(a) => format!("AddrOfSlice({})", a.repr(tcx)),
+            Autoref(a) => format!("Autoref({})", a.repr(tcx)),
+            Coercion(ref a) => format!("Coercion({})", a.repr(tcx)),
             EarlyBoundRegion(a, b) => {
-                format_strbuf!("EarlyBoundRegion({},{})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("EarlyBoundRegion({},{})", a.repr(tcx), b.repr(tcx))
             }
             LateBoundRegion(a, b) => {
-                format_strbuf!("LateBoundRegion({},{})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("LateBoundRegion({},{})", a.repr(tcx), b.repr(tcx))
             }
             BoundRegionInFnType(a, b) => {
-                format_strbuf!("bound_regionInFnType({},{})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("bound_regionInFnType({},{})", a.repr(tcx),
+                b.repr(tcx))
             }
             BoundRegionInCoherence(a) => {
-                format_strbuf!("bound_regionInCoherence({})", a.repr(tcx))
+                format!("bound_regionInCoherence({})", a.repr(tcx))
             }
             UpvarRegion(a, b) => {
-                format_strbuf!("UpvarRegion({}, {})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("UpvarRegion({}, {})", a.repr(tcx), b.repr(tcx))
             }
         }
     }
diff --git a/src/librustc/middle/typeck/infer/region_inference/mod.rs b/src/librustc/middle/typeck/infer/region_inference/mod.rs
index 396dd476e89..0efbe733367 100644
--- a/src/librustc/middle/typeck/infer/region_inference/mod.rs
+++ b/src/librustc/middle/typeck/infer/region_inference/mod.rs
@@ -1342,24 +1342,16 @@ impl Repr for Constraint {
     fn repr(&self, tcx: &ty::ctxt) -> String {
         match *self {
             ConstrainVarSubVar(a, b) => {
-                format_strbuf!("ConstrainVarSubVar({}, {})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("ConstrainVarSubVar({}, {})", a.repr(tcx), b.repr(tcx))
             }
             ConstrainRegSubVar(a, b) => {
-                format_strbuf!("ConstrainRegSubVar({}, {})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("ConstrainRegSubVar({}, {})", a.repr(tcx), b.repr(tcx))
             }
             ConstrainVarSubReg(a, b) => {
-                format_strbuf!("ConstrainVarSubReg({}, {})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("ConstrainVarSubReg({}, {})", a.repr(tcx), b.repr(tcx))
             }
             ConstrainRegSubReg(a, b) => {
-                format_strbuf!("ConstrainRegSubReg({}, {})",
-                               a.repr(tcx),
-                               b.repr(tcx))
+                format!("ConstrainRegSubReg({}, {})", a.repr(tcx), b.repr(tcx))
             }
         }
     }
diff --git a/src/librustc/middle/typeck/infer/to_str.rs b/src/librustc/middle/typeck/infer/to_str.rs
index eaca07b782f..f03ecd9aee1 100644
--- a/src/librustc/middle/typeck/infer/to_str.rs
+++ b/src/librustc/middle/typeck/infer/to_str.rs
@@ -31,12 +31,11 @@ impl InferStr for ty::t {
 
 impl InferStr for FnSig {
     fn inf_str(&self, cx: &InferCtxt) -> String {
-        format_strbuf!("({}) -> {}",
-                       self.inputs
-                           .iter()
-                           .map(|a| a.inf_str(cx))
-                           .collect::<Vec<String>>().connect(", "),
-                       self.output.inf_str(cx))
+        format!("({}) -> {}",
+                self.inputs.iter()
+                    .map(|a| a.inf_str(cx))
+                    .collect::<Vec<String>>().connect(", "),
+                self.output.inf_str(cx))
     }
 }
 
@@ -48,7 +47,7 @@ impl InferStr for ty::mt {
 
 impl InferStr for ty::Region {
     fn inf_str(&self, _cx: &InferCtxt) -> String {
-        format_strbuf!("{:?}", *self)
+        format!("{:?}", *self)
     }
 }
 
@@ -63,18 +62,16 @@ impl<V:InferStr> InferStr for Bound<V> {
 
 impl<T:InferStr> InferStr for Bounds<T> {
     fn inf_str(&self, cx: &InferCtxt) -> String {
-        format_strbuf!("\\{{} <: {}\\}",
-                       self.lb.inf_str(cx),
-                       self.ub.inf_str(cx))
+        format!("\\{{} <: {}\\}", self.lb.inf_str(cx), self.ub.inf_str(cx))
     }
 }
 
 impl<V:Vid + ToStr,T:InferStr> InferStr for VarValue<V, T> {
     fn inf_str(&self, cx: &InferCtxt) -> String {
         match *self {
-          Redirect(ref vid) => format_strbuf!("Redirect({})", vid.to_str()),
+          Redirect(ref vid) => format!("Redirect({})", vid.to_str()),
           Root(ref pt, rk) => {
-              format_strbuf!("Root({}, {})", pt.inf_str(cx), rk)
+              format!("Root({}, {})", pt.inf_str(cx), rk)
           }
         }
     }
diff --git a/src/librustc/middle/typeck/mod.rs b/src/librustc/middle/typeck/mod.rs
index 995ce56078d..bfe09fdd2b2 100644
--- a/src/librustc/middle/typeck/mod.rs
+++ b/src/librustc/middle/typeck/mod.rs
@@ -201,15 +201,15 @@ impl Repr for vtable_origin {
     fn repr(&self, tcx: &ty::ctxt) -> String {
         match *self {
             vtable_static(def_id, ref tys, ref vtable_res) => {
-                format_strbuf!("vtable_static({:?}:{}, {}, {})",
-                               def_id,
-                               ty::item_path_str(tcx, def_id),
-                               tys.repr(tcx),
-                               vtable_res.repr(tcx))
+                format!("vtable_static({:?}:{}, {}, {})",
+                        def_id,
+                        ty::item_path_str(tcx, def_id),
+                        tys.repr(tcx),
+                        vtable_res.repr(tcx))
             }
 
             vtable_param(x, y) => {
-                format_strbuf!("vtable_param({:?}, {:?})", x, y)
+                format!("vtable_param({:?}, {:?})", x, y)
             }
         }
     }
@@ -231,9 +231,9 @@ pub struct impl_res {
 
 impl Repr for impl_res {
     fn repr(&self, tcx: &ty::ctxt) -> String {
-        format_strbuf!("impl_res \\{trait_vtables={}, self_vtables={}\\}",
-                       self.trait_vtables.repr(tcx),
-                       self.self_vtables.repr(tcx))
+        format!("impl_res \\{trait_vtables={}, self_vtables={}\\}",
+                self.trait_vtables.repr(tcx),
+                self.self_vtables.repr(tcx))
     }
 }
 
@@ -354,8 +354,8 @@ fn check_main_fn_ty(ccx: &CrateCtxt,
 
             require_same_types(tcx, None, false, main_span, main_t, se_ty,
                 || {
-                    format_strbuf!("main function expects type: `{}`",
-                                   ppaux::ty_to_str(ccx.tcx, se_ty))
+                    format!("main function expects type: `{}`",
+                            ppaux::ty_to_str(ccx.tcx, se_ty))
                 });
         }
         _ => {
@@ -407,8 +407,8 @@ fn check_start_fn_ty(ccx: &CrateCtxt,
 
             require_same_types(tcx, None, false, start_span, start_t, se_ty,
                 || {
-                    format_strbuf!("start function expects type: `{}`",
-                                   ppaux::ty_to_str(ccx.tcx, se_ty))
+                    format!("start function expects type: `{}`",
+                            ppaux::ty_to_str(ccx.tcx, se_ty))
                 });
 
         }
diff --git a/src/librustc/util/ppaux.rs b/src/librustc/util/ppaux.rs
index 7b8c62fbf88..f73666bebf6 100644
--- a/src/librustc/util/ppaux.rs
+++ b/src/librustc/util/ppaux.rs
@@ -86,9 +86,7 @@ pub fn explain_region_and_span(cx: &ctxt, region: ty::Region)
           }
           Some(_) | None => {
             // this really should not happen
-            (format_strbuf!("unknown scope: {}.  Please report a bug.",
-                            node_id),
-             None)
+            (format!("unknown scope: {}.  Please report a bug.", node_id), None)
           }
         }
       }
@@ -96,29 +94,28 @@ pub fn explain_region_and_span(cx: &ctxt, region: ty::Region)
       ReFree(ref fr) => {
         let prefix = match fr.bound_region {
           BrAnon(idx) => {
-              format_strbuf!("the anonymous lifetime \\#{} defined on",
-                             idx + 1)
+              format!("the anonymous lifetime \\#{} defined on", idx + 1)
           }
           BrFresh(_) => "an anonymous lifetime defined on".to_string(),
           _ => {
-              format_strbuf!("the lifetime {} as defined on",
-                             bound_region_ptr_to_str(cx, fr.bound_region))
+              format!("the lifetime {} as defined on",
+                      bound_region_ptr_to_str(cx, fr.bound_region))
           }
         };
 
         match cx.map.find(fr.scope_id) {
           Some(ast_map::NodeBlock(ref blk)) => {
             let (msg, opt_span) = explain_span(cx, "block", blk.span);
-            (format_strbuf!("{} {}", prefix, msg), opt_span)
+            (format!("{} {}", prefix, msg), opt_span)
           }
           Some(ast_map::NodeItem(it)) if match it.node {
                 ast::ItemImpl(..) => true, _ => false} => {
             let (msg, opt_span) = explain_span(cx, "impl", it.span);
-            (format_strbuf!("{} {}", prefix, msg), opt_span)
+            (format!("{} {}", prefix, msg), opt_span)
           }
           Some(_) | None => {
             // this really should not happen
-            (format_strbuf!("{} node {}", prefix, fr.scope_id), None)
+            (format!("{} node {}", prefix, fr.scope_id), None)
           }
         }
       }
@@ -130,17 +127,15 @@ pub fn explain_region_and_span(cx: &ctxt, region: ty::Region)
       // I believe these cases should not occur (except when debugging,
       // perhaps)
       ty::ReInfer(_) | ty::ReEarlyBound(..) | ty::ReLateBound(..) => {
-        (format_strbuf!("lifetime {:?}", region), None)
+        (format!("lifetime {:?}", region), None)
       }
     };
 
     fn explain_span(cx: &ctxt, heading: &str, span: Span)
         -> (String, Option<Span>) {
         let lo = cx.sess.codemap().lookup_char_pos_adj(span.lo);
-        (format_strbuf!("the {} at {}:{}",
-                        heading,
-                        lo.line,
-                        lo.col.to_uint()), Some(span))
+        (format!("the {} at {}:{}", heading, lo.line, lo.col.to_uint()),
+         Some(span))
     }
 }
 
@@ -154,15 +149,12 @@ pub fn bound_region_to_str(cx: &ctxt,
     let space_str = if space { " " } else { "" };
 
     if cx.sess.verbose() {
-        return format_strbuf!("{}{}{}", prefix, br.repr(cx), space_str)
+        return format!("{}{}{}", prefix, br.repr(cx), space_str)
     }
 
     match br {
         BrNamed(_, name) => {
-            format_strbuf!("{}'{}{}",
-                           prefix,
-                           token::get_name(name),
-                           space_str)
+            format!("{}'{}{}", prefix, token::get_name(name), space_str)
         }
         BrAnon(_) => prefix.to_string(),
         BrFresh(_) => prefix.to_string(),
@@ -180,7 +172,7 @@ pub fn region_to_str(cx: &ctxt, prefix: &str, space: bool, region: Region) -> St
     let space_str = if space { " " } else { "" };
 
     if cx.sess.verbose() {
-        return format_strbuf!("{}{}{}", prefix, region.repr(cx), space_str)
+        return format!("{}{}{}", prefix, region.repr(cx), space_str)
     }
 
     // These printouts are concise.  They do not contain all the information
@@ -198,8 +190,8 @@ pub fn region_to_str(cx: &ctxt, prefix: &str, space: bool, region: Region) -> St
             bound_region_to_str(cx, prefix, space, br)
         }
         ty::ReInfer(ReVar(_)) => prefix.to_string(),
-        ty::ReStatic => format_strbuf!("{}'static{}", prefix, space_str),
-        ty::ReEmpty => format_strbuf!("{}'<empty>{}", prefix, space_str),
+        ty::ReStatic => format!("{}'static{}", prefix, space_str),
+        ty::ReEmpty => format!("{}'<empty>{}", prefix, space_str),
     }
 }
 
@@ -211,30 +203,26 @@ pub fn mutability_to_str(m: ast::Mutability) -> String {
 }
 
 pub fn mt_to_str(cx: &ctxt, m: &mt) -> String {
-    format_strbuf!("{}{}", mutability_to_str(m.mutbl), ty_to_str(cx, m.ty))
+    format!("{}{}", mutability_to_str(m.mutbl), ty_to_str(cx, m.ty))
 }
 
 pub fn trait_store_to_str(cx: &ctxt, s: ty::TraitStore) -> String {
     match s {
         ty::UniqTraitStore => "Box ".to_string(),
         ty::RegionTraitStore(r, m) => {
-            format_strbuf!("{}{}",
-                           region_ptr_to_str(cx, r),
-                           mutability_to_str(m))
+            format!("{}{}", region_ptr_to_str(cx, r), mutability_to_str(m))
         }
     }
 }
 
 pub fn vec_map_to_str<T>(ts: &[T], f: |t: &T| -> String) -> String {
     let tstrs = ts.iter().map(f).collect::<Vec<String>>();
-    format_strbuf!("[{}]", tstrs.connect(", "))
+    format!("[{}]", tstrs.connect(", "))
 }
 
 pub fn fn_sig_to_str(cx: &ctxt, typ: &ty::FnSig) -> String {
-    format_strbuf!("fn{}{} -> {}",
-                   typ.binder_id,
-                   typ.inputs.repr(cx),
-                   typ.output.repr(cx))
+    format!("fn{}{} -> {}", typ.binder_id, typ.inputs.repr(cx),
+            typ.output.repr(cx))
 }
 
 pub fn trait_ref_to_str(cx: &ctxt, trait_ref: &ty::TraitRef) -> String {
@@ -360,9 +348,9 @@ pub fn ty_to_str(cx: &ctxt, typ: t) -> String {
       ty_uint(t) => ast_util::uint_ty_to_str(t, None,
                                              ast_util::AutoSuffix).to_string(),
       ty_float(t) => ast_util::float_ty_to_str(t).to_string(),
-      ty_box(typ) => format_strbuf!("@{}", ty_to_str(cx, typ)),
-      ty_uniq(typ) => format_strbuf!("~{}", ty_to_str(cx, typ)),
-      ty_ptr(ref tm) => format_strbuf!("*{}", mt_to_str(cx, tm)),
+      ty_box(typ) => format!("@{}", ty_to_str(cx, typ)),
+      ty_uniq(typ) => format!("~{}", ty_to_str(cx, typ)),
+      ty_ptr(ref tm) => format!("*{}", mt_to_str(cx, tm)),
       ty_rptr(r, ref tm) => {
           let mut buf = region_ptr_to_str(cx, r);
           buf.push_str(mt_to_str(cx, tm).as_slice());
@@ -370,7 +358,7 @@ pub fn ty_to_str(cx: &ctxt, typ: t) -> String {
       }
       ty_tup(ref elems) => {
         let strs: Vec<String> = elems.iter().map(|elem| ty_to_str(cx, *elem)).collect();
-        format_strbuf!("({})", strs.connect(","))
+        format!("({})", strs.connect(","))
       }
       ty_closure(ref f) => {
           closure_to_str(cx, *f)
@@ -385,12 +373,12 @@ pub fn ty_to_str(cx: &ctxt, typ: t) -> String {
               Some(def) => token::get_ident(def.ident).get().to_string(),
               // This can only happen when a type mismatch error happens and
               // the actual type has more type parameters than the expected one.
-              None => format_strbuf!("<generic \\#{}>", id)
+              None => format!("<generic \\#{}>", id)
           };
           if !cx.sess.verbose() {
               ident
           } else {
-              format_strbuf!("{}:{:?}", ident, did)
+              format!("{}:{:?}", ident, did)
           }
       }
       ty_self(..) => "Self".to_string(),
@@ -411,19 +399,19 @@ pub fn ty_to_str(cx: &ctxt, typ: t) -> String {
                                substs.tps.as_slice(), did, true);
         let bound_sep = if bounds.is_empty() { "" } else { ":" };
         let bound_str = bounds.repr(cx);
-        format_strbuf!("{}{}{}{}",
-                       trait_store_to_str(cx, store),
-                       ty,
-                       bound_sep,
-                       bound_str)
+        format!("{}{}{}{}",
+                trait_store_to_str(cx, store),
+                ty,
+                bound_sep,
+                bound_str)
       }
       ty_str => "str".to_string(),
       ty_vec(ref mt, sz) => {
           match sz {
               Some(n) => {
-                  format_strbuf!("[{}, .. {}]", mt_to_str(cx, mt), n)
+                  format!("[{}, .. {}]", mt_to_str(cx, mt), n)
               }
-              None => format_strbuf!("[{}]", ty_to_str(cx, mt.ty)),
+              None => format!("[{}]", ty_to_str(cx, mt.ty)),
           }
       }
     }
@@ -476,9 +464,9 @@ pub fn parameterized(cx: &ctxt,
     }
 
     if strs.len() > 0u {
-        format_strbuf!("{}<{}>", base, strs.connect(","))
+        format!("{}<{}>", base, strs.connect(","))
     } else {
-        format_strbuf!("{}", base)
+        format!("{}", base)
     }
 }
 
@@ -503,7 +491,7 @@ impl<T:Repr,U:Repr> Repr for Result<T,U> {
     fn repr(&self, tcx: &ctxt) -> String {
         match self {
             &Ok(ref t) => t.repr(tcx),
-            &Err(ref u) => format_strbuf!("Err({})", u.repr(tcx))
+            &Err(ref u) => format!("Err({})", u.repr(tcx))
         }
     }
 }
@@ -558,17 +546,16 @@ impl<T:Repr> Repr for Vec<T> {
 
 impl Repr for ty::TypeParameterDef {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("TypeParameterDef({:?}, {})",
-                       self.def_id,
-                       self.bounds.repr(tcx))
+        format!("TypeParameterDef({:?}, {})", self.def_id,
+                self.bounds.repr(tcx))
     }
 }
 
 impl Repr for ty::RegionParameterDef {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("RegionParameterDef({}, {:?})",
-                       token::get_name(self.name),
-                       self.def_id)
+        format!("RegionParameterDef({}, {:?})",
+                token::get_name(self.name),
+                self.def_id)
     }
 }
 
@@ -580,16 +567,16 @@ impl Repr for ty::t {
 
 impl Repr for ty::substs {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("substs(regions={}, self_ty={}, tps={})",
-                       self.regions.repr(tcx),
-                       self.self_ty.repr(tcx),
-                       self.tps.repr(tcx))
+        format!("substs(regions={}, self_ty={}, tps={})",
+                self.regions.repr(tcx),
+                self.self_ty.repr(tcx),
+                self.tps.repr(tcx))
     }
 }
 
 impl Repr for ty::ItemSubsts {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("ItemSubsts({})", self.substs.repr(tcx))
+        format!("ItemSubsts({})", self.substs.repr(tcx))
     }
 }
 
@@ -629,40 +616,38 @@ impl Repr for ty::TraitRef {
 
 impl Repr for ast::Expr {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("expr({}: {})", self.id, pprust::expr_to_str(self))
+        format!("expr({}: {})", self.id, pprust::expr_to_str(self))
     }
 }
 
 impl Repr for ast::Item {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("item({})", tcx.map.node_to_str(self.id))
+        format!("item({})", tcx.map.node_to_str(self.id))
     }
 }
 
 impl Repr for ast::Stmt {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("stmt({}: {})",
-                       ast_util::stmt_id(self),
-                       pprust::stmt_to_str(self))
+        format!("stmt({}: {})",
+                ast_util::stmt_id(self),
+                pprust::stmt_to_str(self))
     }
 }
 
 impl Repr for ast::Pat {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("pat({}: {})", self.id, pprust::pat_to_str(self))
+        format!("pat({}: {})", self.id, pprust::pat_to_str(self))
     }
 }
 
 impl Repr for ty::BoundRegion {
     fn repr(&self, tcx: &ctxt) -> String {
         match *self {
-            ty::BrAnon(id) => format_strbuf!("BrAnon({})", id),
+            ty::BrAnon(id) => format!("BrAnon({})", id),
             ty::BrNamed(id, name) => {
-                format_strbuf!("BrNamed({}, {})",
-                               id.repr(tcx),
-                               token::get_name(name))
+                format!("BrNamed({}, {})", id.repr(tcx), token::get_name(name))
             }
-            ty::BrFresh(id) => format_strbuf!("BrFresh({})", id),
+            ty::BrFresh(id) => format!("BrFresh({})", id),
         }
     }
 }
@@ -671,26 +656,26 @@ impl Repr for ty::Region {
     fn repr(&self, tcx: &ctxt) -> String {
         match *self {
             ty::ReEarlyBound(id, index, name) => {
-                format_strbuf!("ReEarlyBound({}, {}, {})",
-                               id,
-                               index,
-                               token::get_name(name))
+                format!("ReEarlyBound({}, {}, {})",
+                        id,
+                        index,
+                        token::get_name(name))
             }
 
             ty::ReLateBound(binder_id, ref bound_region) => {
-                format_strbuf!("ReLateBound({}, {})",
-                               binder_id,
-                               bound_region.repr(tcx))
+                format!("ReLateBound({}, {})",
+                        binder_id,
+                        bound_region.repr(tcx))
             }
 
             ty::ReFree(ref fr) => {
-                format_strbuf!("ReFree({}, {})",
-                               fr.scope_id,
-                               fr.bound_region.repr(tcx))
+                format!("ReFree({}, {})",
+                        fr.scope_id,
+                        fr.bound_region.repr(tcx))
             }
 
             ty::ReScope(id) => {
-                format_strbuf!("ReScope({})", id)
+                format!("ReScope({})", id)
             }
 
             ty::ReStatic => {
@@ -698,11 +683,11 @@ impl Repr for ty::Region {
             }
 
             ty::ReInfer(ReVar(ref vid)) => {
-                format_strbuf!("ReInfer({})", vid.id)
+                format!("ReInfer({})", vid.id)
             }
 
             ty::ReInfer(ReSkolemized(id, ref bound_region)) => {
-                format_strbuf!("re_skolemized({}, {})",
+                format!("re_skolemized({}, {})",
                                id,
                                bound_region.repr(tcx))
             }
@@ -728,7 +713,7 @@ impl Repr for ast::DefId {
                     Some(ast_map::NodeTraitMethod(..)) |
                     Some(ast_map::NodeVariant(..)) |
                     Some(ast_map::NodeStructCtor(..)) => {
-                        return format_strbuf!(
+                        return format!(
                                 "{:?}:{}",
                                 *self,
                                 ty::item_path_str(tcx, *self))
@@ -737,35 +722,32 @@ impl Repr for ast::DefId {
                 }
             }
         }
-        return format_strbuf!("{:?}", *self)
+        return format!("{:?}", *self)
     }
 }
 
 impl Repr for ty::ty_param_bounds_and_ty {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("ty_param_bounds_and_ty \\{generics: {}, ty: {}\\}",
-                       self.generics.repr(tcx),
-                       self.ty.repr(tcx))
+        format!("ty_param_bounds_and_ty \\{generics: {}, ty: {}\\}",
+                self.generics.repr(tcx),
+                self.ty.repr(tcx))
     }
 }
 
 impl Repr for ty::Generics {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("Generics(type_param_defs: {}, \
-                           region_param_defs: {})",
-                 self.type_param_defs().repr(tcx),
-                 self.region_param_defs().repr(tcx))
+        format!("Generics(type_param_defs: {}, region_param_defs: {})",
+                self.type_param_defs().repr(tcx),
+                self.region_param_defs().repr(tcx))
     }
 }
 
 impl Repr for ty::ItemVariances {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("IterVariances(self_param={}, \
-                                type_params={}, \
-                                region_params={})",
-                 self.self_param.repr(tcx),
-                 self.type_params.repr(tcx),
-                 self.region_params.repr(tcx))
+        format!("IterVariances(self_param={}, type_params={}, region_params={})",
+                self.self_param.repr(tcx),
+                self.type_params.repr(tcx),
+                self.region_params.repr(tcx))
     }
 }
 
@@ -777,14 +759,14 @@ impl Repr for ty::Variance {
 
 impl Repr for ty::Method {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("method(ident: {}, generics: {}, fty: {}, \
-                        explicit_self: {}, vis: {}, def_id: {})",
-                       self.ident.repr(tcx),
-                       self.generics.repr(tcx),
-                       self.fty.repr(tcx),
-                       self.explicit_self.repr(tcx),
-                       self.vis.repr(tcx),
-                       self.def_id.repr(tcx))
+        format!("method(ident: {}, generics: {}, fty: {}, \
+                 explicit_self: {}, vis: {}, def_id: {})",
+                self.ident.repr(tcx),
+                self.generics.repr(tcx),
+                self.fty.repr(tcx),
+                self.explicit_self.repr(tcx),
+                self.vis.repr(tcx),
+                self.def_id.repr(tcx))
     }
 }
 
@@ -802,22 +784,22 @@ impl Repr for ast::Ident {
 
 impl Repr for ast::ExplicitSelf_ {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("{:?}", *self)
+        format!("{:?}", *self)
     }
 }
 
 impl Repr for ast::Visibility {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("{:?}", *self)
+        format!("{:?}", *self)
     }
 }
 
 impl Repr for ty::BareFnTy {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("BareFnTy \\{fn_style: {:?}, abi: {}, sig: {}\\}",
-                       self.fn_style,
-                       self.abi.to_str(),
-                       self.sig.repr(tcx))
+        format!("BareFnTy \\{fn_style: {:?}, abi: {}, sig: {}\\}",
+                self.fn_style,
+                self.abi.to_str(),
+                self.sig.repr(tcx))
     }
 }
 
@@ -829,10 +811,10 @@ impl Repr for ty::FnSig {
 
 impl Repr for typeck::MethodCallee {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("MethodCallee \\{origin: {}, ty: {}, {}\\}",
-                       self.origin.repr(tcx),
-                       self.ty.repr(tcx),
-                       self.substs.repr(tcx))
+        format!("MethodCallee \\{origin: {}, ty: {}, {}\\}",
+                self.origin.repr(tcx),
+                self.ty.repr(tcx),
+                self.substs.repr(tcx))
     }
 }
 
@@ -840,7 +822,7 @@ impl Repr for typeck::MethodOrigin {
     fn repr(&self, tcx: &ctxt) -> String {
         match self {
             &typeck::MethodStatic(def_id) => {
-                format_strbuf!("MethodStatic({})", def_id.repr(tcx))
+                format!("MethodStatic({})", def_id.repr(tcx))
             }
             &typeck::MethodParam(ref p) => {
                 p.repr(tcx)
@@ -854,27 +836,27 @@ impl Repr for typeck::MethodOrigin {
 
 impl Repr for typeck::MethodParam {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("MethodParam({},{:?},{:?},{:?})",
-                       self.trait_id.repr(tcx),
-                       self.method_num,
-                       self.param_num,
-                       self.bound_num)
+        format!("MethodParam({},{:?},{:?},{:?})",
+                self.trait_id.repr(tcx),
+                self.method_num,
+                self.param_num,
+                self.bound_num)
     }
 }
 
 impl Repr for typeck::MethodObject {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("MethodObject({},{:?},{:?})",
-                       self.trait_id.repr(tcx),
-                       self.method_num,
-                       self.real_index)
+        format!("MethodObject({},{:?},{:?})",
+                self.trait_id.repr(tcx),
+                self.method_num,
+                self.real_index)
     }
 }
 
 
 impl Repr for ty::RegionVid {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("{:?}", *self)
+        format!("{:?}", *self)
     }
 }
 
@@ -886,7 +868,7 @@ impl Repr for ty::TraitStore {
 
 impl Repr for ty::BuiltinBound {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("{:?}", *self)
+        format!("{:?}", *self)
     }
 }
 
@@ -980,29 +962,29 @@ impl UserString for abi::Abi {
 
 impl Repr for ty::UpvarId {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("UpvarId({};`{}`;{})",
-                       self.var_id,
-                       ty::local_var_name_str(tcx, self.var_id),
-                       self.closure_expr_id)
+        format!("UpvarId({};`{}`;{})",
+                self.var_id,
+                ty::local_var_name_str(tcx, self.var_id),
+                self.closure_expr_id)
     }
 }
 
 impl Repr for ast::Mutability {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("{:?}", *self)
+        format!("{:?}", *self)
     }
 }
 
 impl Repr for ty::BorrowKind {
     fn repr(&self, _tcx: &ctxt) -> String {
-        format_strbuf!("{:?}", *self)
+        format!("{:?}", *self)
     }
 }
 
 impl Repr for ty::UpvarBorrow {
     fn repr(&self, tcx: &ctxt) -> String {
-        format_strbuf!("UpvarBorrow({}, {})",
-                       self.kind.repr(tcx),
-                       self.region.repr(tcx))
+        format!("UpvarBorrow({}, {})",
+                self.kind.repr(tcx),
+                self.region.repr(tcx))
     }
 }
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 33e3e5370e6..aab236417a5 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -1000,7 +1000,7 @@ impl Clean<Type> for ty::t {
             ty::ty_str => String,
             ty::ty_vec(mt, None) => Vector(box mt.ty.clean()),
             ty::ty_vec(mt, Some(i)) => FixedVector(box mt.ty.clean(),
-                                                   format_strbuf!("{}", i)),
+                                                   format!("{}", i)),
             ty::ty_ptr(mt) => RawPointer(mt.mutbl.clean(), box mt.ty.clean()),
             ty::ty_rptr(r, mt) => BorrowedRef {
                 lifetime: r.clean(),
@@ -1697,8 +1697,8 @@ impl ToSource for syntax::codemap::Span {
 fn lit_to_str(lit: &ast::Lit) -> String {
     match lit.node {
         ast::LitStr(ref st, _) => st.get().to_string(),
-        ast::LitBinary(ref data) => format_strbuf!("{:?}", data.as_slice()),
-        ast::LitChar(c) => format_strbuf!("'{}'", c),
+        ast::LitBinary(ref data) => format!("{:?}", data.as_slice()),
+        ast::LitChar(c) => format!("'{}'", c),
         ast::LitInt(i, _t) => i.to_str().to_string(),
         ast::LitUint(u, _t) => u.to_str().to_string(),
         ast::LitIntUnsuffixed(i) => i.to_str().to_string(),
@@ -1817,7 +1817,7 @@ pub struct Macro {
 impl Clean<Item> for doctree::Macro {
     fn clean(&self) -> Item {
         Item {
-            name: Some(format_strbuf!("{}!", self.name.clean())),
+            name: Some(format!("{}!", self.name.clean())),
             attrs: self.attrs.clean(),
             source: self.where.clean(),
             visibility: ast::Public.clean(),
diff --git a/src/librustdoc/html/format.rs b/src/librustdoc/html/format.rs
index e3221177afe..7af1eb21aea 100644
--- a/src/librustdoc/html/format.rs
+++ b/src/librustdoc/html/format.rs
@@ -366,7 +366,7 @@ impl fmt::Show for clean::Type {
                        lifetimes = if decl.lifetimes.len() == 0 {
                            "".to_string()
                        } else {
-                           format_strbuf!("&lt;{:#}&gt;", decl.lifetimes)
+                           format!("&lt;{:#}&gt;", decl.lifetimes)
                        },
                        args = decl.decl.inputs,
                        bounds = if decl.bounds.len() == 0 {
@@ -375,7 +375,7 @@ impl fmt::Show for clean::Type {
                            let mut m = decl.bounds
                                            .iter()
                                            .map(|s| s.to_str().to_string());
-                           format_strbuf!(
+                           format!(
                                ": {}",
                                m.collect::<Vec<String>>().connect(" + "))
                        },
@@ -388,7 +388,7 @@ impl fmt::Show for clean::Type {
                        match decl.abi.as_slice() {
                            "" => " extern ".to_string(),
                            "\"Rust\"" => "".to_string(),
-                           s => format_strbuf!(" extern {} ", s)
+                           s => format!(" extern {} ", s)
                        },
                        decl.generics,
                        decl.decl)
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index d1153db8d30..cafbbaa828b 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -223,7 +223,7 @@ pub fn render(w: &mut fmt::Formatter, s: &str, print_toc: bool) -> fmt::Result {
         let map = used_header_map.get().unwrap();
         let id = match map.borrow_mut().find_mut(&id) {
             None => id,
-            Some(a) => { *a += 1; format_strbuf!("{}-{}", id, *a - 1) }
+            Some(a) => { *a += 1; format!("{}-{}", id, *a - 1) }
         };
         map.borrow_mut().insert(id.clone(), 1);
 
diff --git a/src/librustdoc/html/render.rs b/src/librustdoc/html/render.rs
index d0974c25e95..22619bdbf85 100644
--- a/src/librustdoc/html/render.rs
+++ b/src/librustdoc/html/render.rs
@@ -578,7 +578,7 @@ fn extern_location(e: &clean::ExternalCrate, dst: &Path) -> ExternalLocation {
                             if s.as_slice().ends_with("/") {
                                 return Remote(s.to_string());
                             }
-                            return Remote(format_strbuf!("{}/", s));
+                            return Remote(format!("{}/", s));
                         }
                         _ => {}
                     }
@@ -1187,12 +1187,12 @@ impl<'a> fmt::Show for Item<'a> {
 fn item_path(item: &clean::Item) -> String {
     match item.inner {
         clean::ModuleItem(..) => {
-            format_strbuf!("{}/index.html", item.name.get_ref())
+            format!("{}/index.html", item.name.get_ref())
         }
         _ => {
-            format_strbuf!("{}.{}.html",
-                           shortty(item).to_static_str(),
-                           *item.name.get_ref())
+            format!("{}.{}.html",
+                    shortty(item).to_static_str(),
+                    *item.name.get_ref())
         }
     }
 }
diff --git a/src/librustdoc/html/toc.rs b/src/librustdoc/html/toc.rs
index 212fe006aa1..aa01247c1b6 100644
--- a/src/librustdoc/html/toc.rs
+++ b/src/librustdoc/html/toc.rs
@@ -154,7 +154,7 @@ impl TocBuilder {
                 sec_number.push_str("0.");
             }
             let number = toc.count_entries_with_level(level);
-            sec_number.push_str(format_strbuf!("{}", number + 1).as_slice())
+            sec_number.push_str(format!("{}", number + 1).as_slice())
         }
 
         self.chain.push(TocEntry {
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index ae708a71987..fe53439703a 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -248,7 +248,7 @@ fn acquire_input(input: &str,
     match matches.opt_str("r").as_ref().map(|s| s.as_slice()) {
         Some("rust") => Ok(rust_input(input, matches)),
         Some("json") => json_input(input),
-        Some(s) => Err(format_strbuf!("unknown input format: {}", s)),
+        Some(s) => Err(format!("unknown input format: {}", s)),
         None => {
             if input.ends_with(".json") {
                 json_input(input)
@@ -356,7 +356,7 @@ fn json_input(input: &str) -> Result<Output, String> {
     let mut input = match File::open(&Path::new(input)) {
         Ok(f) => f,
         Err(e) => {
-            return Err(format_strbuf!("couldn't open {}: {}", input, e))
+            return Err(format!("couldn't open {}: {}", input, e))
         }
     };
     match json::from_reader(&mut input) {
@@ -367,7 +367,7 @@ fn json_input(input: &str) -> Result<Output, String> {
             match obj.pop(&"schema".to_string()) {
                 Some(json::String(version)) => {
                     if version.as_slice() != SCHEMA_VERSION {
-                        return Err(format_strbuf!(
+                        return Err(format!(
                                 "sorry, but I only understand version {}",
                                 SCHEMA_VERSION))
                     }
diff --git a/src/librustdoc/test.rs b/src/librustdoc/test.rs
index a7abbe0360f..e5fc8f1f1a1 100644
--- a/src/librustdoc/test.rs
+++ b/src/librustdoc/test.rs
@@ -260,9 +260,9 @@ impl Collector {
     pub fn add_test(&mut self, test: String, should_fail: bool, no_run: bool, should_ignore: bool) {
         let name = if self.use_headers {
             let s = self.current_header.as_ref().map(|s| s.as_slice()).unwrap_or("");
-            format_strbuf!("{}_{}", s, self.cnt)
+            format!("{}_{}", s, self.cnt)
         } else {
-            format_strbuf!("{}_{}", self.names.connect("::"), self.cnt)
+            format!("{}_{}", self.names.connect("::"), self.cnt)
         };
         self.cnt += 1;
         let libs = self.libs.clone();
diff --git a/src/libsemver/lib.rs b/src/libsemver/lib.rs
index a119d4832db..51dcc6d3faf 100644
--- a/src/libsemver/lib.rs
+++ b/src/libsemver/lib.rs
@@ -377,13 +377,13 @@ fn test_ne() {
 
 #[test]
 fn test_show() {
-    assert_eq!(format_strbuf!("{}", parse("1.2.3").unwrap()),
+    assert_eq!(format!("{}", parse("1.2.3").unwrap()),
                "1.2.3".to_string());
-    assert_eq!(format_strbuf!("{}", parse("1.2.3-alpha1").unwrap()),
+    assert_eq!(format!("{}", parse("1.2.3-alpha1").unwrap()),
                "1.2.3-alpha1".to_string());
-    assert_eq!(format_strbuf!("{}", parse("1.2.3+build.42").unwrap()),
+    assert_eq!(format!("{}", parse("1.2.3+build.42").unwrap()),
                "1.2.3+build.42".to_string());
-    assert_eq!(format_strbuf!("{}", parse("1.2.3-alpha1+42").unwrap()),
+    assert_eq!(format!("{}", parse("1.2.3-alpha1+42").unwrap()),
                "1.2.3-alpha1+42".to_string());
 }
 
diff --git a/src/libserialize/ebml.rs b/src/libserialize/ebml.rs
index a127c11f509..67045476f6d 100644
--- a/src/libserialize/ebml.rs
+++ b/src/libserialize/ebml.rs
@@ -313,10 +313,8 @@ pub mod reader {
                     self.pos = r_doc.end;
                     let str = r_doc.as_str_slice();
                     if lbl != str {
-                        return Err(Expected(format_strbuf!("Expected label \
-                                                            {} but found {}",
-                                                           lbl,
-                                                           str)));
+                        return Err(Expected(format!("Expected label {} but \
+                                                     found {}", lbl, str)));
                     }
                 }
             }
@@ -326,8 +324,8 @@ pub mod reader {
         fn next_doc(&mut self, exp_tag: EbmlEncoderTag) -> DecodeResult<Doc<'doc>> {
             debug!(". next_doc(exp_tag={})", exp_tag);
             if self.pos >= self.parent.end {
-                return Err(Expected(format_strbuf!("no more documents in \
-                                                    current node!")));
+                return Err(Expected(format!("no more documents in \
+                                             current node!")));
             }
             let TaggedDoc { tag: r_tag, doc: r_doc } =
                 try!(doc_at(self.parent.data, self.pos));
@@ -339,18 +337,13 @@ pub mod reader {
                    r_doc.start,
                    r_doc.end);
             if r_tag != (exp_tag as uint) {
-                return Err(Expected(format_strbuf!("expected EBML doc with \
-                                                    tag {} but found tag \
-                                                    {}",
-                                                   exp_tag,
-                                                   r_tag)));
+                return Err(Expected(format!("expected EBML doc with tag {} but \
+                                             found tag {}", exp_tag, r_tag)));
             }
             if r_doc.end > self.parent.end {
-                return Err(Expected(format_strbuf!("invalid EBML, child \
-                                                    extends to {:#x}, parent \
-                                                    to {:#x}",
-                                                   r_doc.end,
-                                                   self.parent.end)));
+                return Err(Expected(format!("invalid EBML, child extends to \
+                                             {:#x}, parent to {:#x}",
+                                            r_doc.end, self.parent.end)));
             }
             self.pos = r_doc.end;
             Ok(r_doc)
@@ -582,8 +575,7 @@ pub mod reader {
                         0 => f(this, false),
                         1 => f(this, true),
                         _ => {
-                            Err(Expected(format_strbuf!("Expected None or \
-                                                         Some")))
+                            Err(Expected(format!("Expected None or Some")))
                         }
                     }
                 })
@@ -664,7 +656,7 @@ pub mod writer {
             _ => Err(io::IoError {
                 kind: io::OtherIoError,
                 desc: "int too big",
-                detail: Some(format_strbuf!("{}", n))
+                detail: Some(format!("{}", n))
             })
         }
     }
@@ -677,7 +669,7 @@ pub mod writer {
         Err(io::IoError {
             kind: io::OtherIoError,
             desc: "int too big",
-            detail: Some(format_strbuf!("{}", n))
+            detail: Some(format!("{}", n))
         })
     }
 
diff --git a/src/libserialize/hex.rs b/src/libserialize/hex.rs
index 373bff8b0cc..8ae3336c342 100644
--- a/src/libserialize/hex.rs
+++ b/src/libserialize/hex.rs
@@ -174,8 +174,7 @@ mod tests {
     #[test]
     pub fn test_to_hex_all_bytes() {
         for i in range(0, 256) {
-            assert_eq!([i as u8].to_hex(),
-                       format_strbuf!("{:02x}", i as uint));
+            assert_eq!([i as u8].to_hex(), format!("{:02x}", i as uint));
         }
     }
 
diff --git a/src/libserialize/json.rs b/src/libserialize/json.rs
index 08ac66959bc..09ba46bf0c7 100644
--- a/src/libserialize/json.rs
+++ b/src/libserialize/json.rs
@@ -1819,7 +1819,7 @@ macro_rules! expect(
         match $e {
             Null => Ok(()),
             other => Err(ExpectedError("Null".to_string(),
-                                       format_strbuf!("{}", other)))
+                                       format!("{}", other)))
         }
     });
     ($e:expr, $t:ident) => ({
@@ -1827,7 +1827,7 @@ macro_rules! expect(
             $t(v) => Ok(v),
             other => {
                 Err(ExpectedError(stringify!($t).to_string(),
-                                  format_strbuf!("{}", other)))
+                                  format!("{}", other)))
             }
         }
     })
@@ -1869,7 +1869,7 @@ impl ::Decoder<DecoderError> for Decoder {
             },
             value => {
                 Err(ExpectedError("Number".to_string(),
-                                  format_strbuf!("{}", value)))
+                                  format!("{}", value)))
             }
         }
     }
@@ -1887,7 +1887,7 @@ impl ::Decoder<DecoderError> for Decoder {
             }
         }
         Err(ExpectedError("single character string".to_string(),
-                          format_strbuf!("{}", s)))
+                          format!("{}", s)))
     }
 
     fn read_str(&mut self) -> DecodeResult<String> {
@@ -1914,7 +1914,7 @@ impl ::Decoder<DecoderError> for Decoder {
                     Some(String(s)) => s,
                     Some(val) => {
                         return Err(ExpectedError("String".to_string(),
-                                                 format_strbuf!("{}", val)))
+                                                 format!("{}", val)))
                     }
                     None => {
                         return Err(MissingFieldError("variant".to_string()))
@@ -1928,7 +1928,7 @@ impl ::Decoder<DecoderError> for Decoder {
                     },
                     Some(val) => {
                         return Err(ExpectedError("List".to_string(),
-                                                 format_strbuf!("{}", val)))
+                                                 format!("{}", val)))
                     }
                     None => {
                         return Err(MissingFieldError("fields".to_string()))
@@ -1938,7 +1938,7 @@ impl ::Decoder<DecoderError> for Decoder {
             }
             json => {
                 return Err(ExpectedError("String or Object".to_string(),
-                                         format_strbuf!("{}", json)))
+                                         format!("{}", json)))
             }
         };
         let idx = match names.iter()
diff --git a/src/libstd/ascii.rs b/src/libstd/ascii.rs
index 55bbf4ddf75..75b31f9c354 100644
--- a/src/libstd/ascii.rs
+++ b/src/libstd/ascii.rs
@@ -783,6 +783,6 @@ mod tests {
     #[test]
     fn test_show() {
         let c = Ascii { chr: 't' as u8 };
-        assert_eq!(format_strbuf!("{}", c), "t".to_string());
+        assert_eq!(format!("{}", c), "t".to_string());
     }
 }
diff --git a/src/libstd/fmt.rs b/src/libstd/fmt.rs
index d53a0f93c9b..9bca2f4248c 100644
--- a/src/libstd/fmt.rs
+++ b/src/libstd/fmt.rs
@@ -562,13 +562,6 @@ pub fn format(args: &Arguments) -> string::String{
     str::from_utf8(output.unwrap().as_slice()).unwrap().into_string()
 }
 
-/// Temporary transition utility
-pub fn format_strbuf(args: &Arguments) -> string::String {
-    let mut output = io::MemWriter::new();
-    let _ = write!(&mut output, "{}", args);
-    str::from_utf8(output.unwrap().as_slice()).unwrap().into_string()
-}
-
 #[cfg(stage0)]
 impl<T> Poly for T {
     fn fmt(&self, f: &mut Formatter) -> Result {
diff --git a/src/libstd/io/fs.rs b/src/libstd/io/fs.rs
index d3e250be9a3..a77c7107f28 100644
--- a/src/libstd/io/fs.rs
+++ b/src/libstd/io/fs.rs
@@ -745,8 +745,7 @@ mod test {
     pub fn tmpdir() -> TempDir {
         use os;
         use rand;
-        let ret = os::tmpdir().join(
-            format_strbuf!("rust-{}", rand::random::<u32>()));
+        let ret = os::tmpdir().join(format!("rust-{}", rand::random::<u32>()));
         check!(io::fs::mkdir(&ret, io::UserRWX));
         TempDir(ret)
     }
@@ -953,7 +952,7 @@ mod test {
         check!(mkdir(dir, io::UserRWX));
         let prefix = "foo";
         for n in range(0,3) {
-            let f = dir.join(format_strbuf!("{}.txt", n));
+            let f = dir.join(format!("{}.txt", n));
             let mut w = check!(File::create(&f));
             let msg_str = format!("{}{}", prefix, n.to_str());
             let msg = msg_str.as_slice().as_bytes();
@@ -1040,7 +1039,7 @@ mod test {
         let tmpdir = tmpdir();
 
         let mut dirpath = tmpdir.path().clone();
-        dirpath.push(format_strbuf!("test-가一ー你好"));
+        dirpath.push(format!("test-가一ー你好"));
         check!(mkdir(&dirpath, io::UserRWX));
         assert!(dirpath.is_dir());
 
@@ -1057,7 +1056,7 @@ mod test {
 
         let tmpdir = tmpdir();
         let unicode = tmpdir.path();
-        let unicode = unicode.join(format_strbuf!("test-각丁ー再见"));
+        let unicode = unicode.join(format!("test-각丁ー再见"));
         check!(mkdir(&unicode, io::UserRWX));
         assert!(unicode.exists());
         assert!(!Path::new("test/unicode-bogus-path-각丁ー再见").exists());
diff --git a/src/libstd/io/tempfile.rs b/src/libstd/io/tempfile.rs
index 806df838c91..5ca7e417af6 100644
--- a/src/libstd/io/tempfile.rs
+++ b/src/libstd/io/tempfile.rs
@@ -43,10 +43,10 @@ impl TempDir {
 
         for _ in range(0u, 1000) {
             let filename =
-                format_strbuf!("rs-{}-{}-{}",
-                               unsafe { libc::getpid() },
-                               unsafe { CNT.fetch_add(1, atomics::SeqCst) },
-                               suffix);
+                format!("rs-{}-{}-{}",
+                        unsafe { libc::getpid() },
+                        unsafe { CNT.fetch_add(1, atomics::SeqCst) },
+                        suffix);
             let p = tmpdir.join(filename);
             match fs::mkdir(&p, io::UserRWX) {
                 Err(..) => {}
diff --git a/src/libstd/io/test.rs b/src/libstd/io/test.rs
index bc52bc9946c..4d3dde46b57 100644
--- a/src/libstd/io/test.rs
+++ b/src/libstd/io/test.rs
@@ -67,14 +67,14 @@ pub fn next_test_unix() -> Path {
     // base port and pid are an attempt to be unique between multiple
     // test-runners of different configurations running on one
     // buildbot, the count is to be unique within this executable.
-    let string = format_strbuf!("rust-test-unix-path-{}-{}-{}",
-                                base_port(),
-                                unsafe {libc::getpid()},
-                                unsafe {COUNT.fetch_add(1, Relaxed)});
+    let string = format!("rust-test-unix-path-{}-{}-{}",
+                         base_port(),
+                         unsafe {libc::getpid()},
+                         unsafe {COUNT.fetch_add(1, Relaxed)});
     if cfg!(unix) {
         os::tmpdir().join(string)
     } else {
-        Path::new(format_strbuf!("{}{}", r"\\.\pipe\", string))
+        Path::new(format!("{}{}", r"\\.\pipe\", string))
     }
 }
 
diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs
index 28b4552fd4c..0b9fc250636 100644
--- a/src/libstd/macros.rs
+++ b/src/libstd/macros.rs
@@ -229,14 +229,6 @@ macro_rules! format(
     )
 )
 
-/// Temporary transitionary thing.
-#[macro_export]
-macro_rules! format_strbuf(
-    ($($arg:tt)*) => (
-        format_args!(::std::fmt::format_strbuf, $($arg)*)
-    )
-)
-
 /// Use the `format!` syntax to write data into a buffer of type `&mut Writer`.
 /// See `std::fmt` for more information.
 ///
diff --git a/src/libstd/num/int_macros.rs b/src/libstd/num/int_macros.rs
index 7ed00e3dd9d..889a42ec00e 100644
--- a/src/libstd/num/int_macros.rs
+++ b/src/libstd/num/int_macros.rs
@@ -78,7 +78,7 @@ impl ToStrRadix for $T {
     /// Convert to a string in a given base.
     #[inline]
     fn to_str_radix(&self, radix: uint) -> String {
-        format_strbuf!("{}", ::fmt::radix(*self, radix as u8))
+        format!("{}", ::fmt::radix(*self, radix as u8))
     }
 }
 
diff --git a/src/libstd/num/uint_macros.rs b/src/libstd/num/uint_macros.rs
index 43048453717..769588d0bcb 100644
--- a/src/libstd/num/uint_macros.rs
+++ b/src/libstd/num/uint_macros.rs
@@ -79,7 +79,7 @@ impl ToStrRadix for $T {
     /// Convert to a string in a given base.
     #[inline]
     fn to_str_radix(&self, radix: uint) -> String {
-        format_strbuf!("{}", ::fmt::radix(*self, radix as u8))
+        format!("{}", ::fmt::radix(*self, radix as u8))
     }
 }
 
diff --git a/src/libstd/os.rs b/src/libstd/os.rs
index 7d3758d621d..f960228c63c 100644
--- a/src/libstd/os.rs
+++ b/src/libstd/os.rs
@@ -437,7 +437,7 @@ pub fn pipe() -> Pipe {
 
 /// Returns the proper dll filename for the given basename of a file.
 pub fn dll_filename(base: &str) -> String {
-    format_strbuf!("{}{}{}", consts::DLL_PREFIX, base, consts::DLL_SUFFIX)
+    format!("{}{}{}", consts::DLL_PREFIX, base, consts::DLL_SUFFIX)
 }
 
 /// Optionally returns the filesystem path of the current executable which is
@@ -1513,7 +1513,7 @@ mod tests {
 
     fn make_rand_name() -> String {
         let mut rng = rand::task_rng();
-        let n = format_strbuf!("TEST{}", rng.gen_ascii_str(10u).as_slice());
+        let n = format!("TEST{}", rng.gen_ascii_str(10u).as_slice());
         assert!(getenv(n.as_slice()).is_none());
         n
     }
diff --git a/src/libstd/path/windows.rs b/src/libstd/path/windows.rs
index 1fc2fa1d221..88c3e9def8c 100644
--- a/src/libstd/path/windows.rs
+++ b/src/libstd/path/windows.rs
@@ -900,7 +900,7 @@ pub fn make_non_verbatim(path: &Path) -> Option<Path> {
         }
         Some(VerbatimUNCPrefix(_,_)) => {
             // \\?\UNC\server\share
-            Path::new(format_strbuf!(r"\\{}", repr.slice_from(7)))
+            Path::new(format!(r"\\{}", repr.slice_from(7)))
         }
     };
     if new_path.prefix.is_none() {
diff --git a/src/libstd/rt/unwind.rs b/src/libstd/rt/unwind.rs
index be05bfceaac..f34dcaaa427 100644
--- a/src/libstd/rt/unwind.rs
+++ b/src/libstd/rt/unwind.rs
@@ -354,7 +354,7 @@ pub fn begin_unwind_fmt(msg: &fmt::Arguments, file: &'static str,
     // required with the current scheme, and (b) we don't handle
     // failure + OOM properly anyway (see comment in begin_unwind
     // below).
-    begin_unwind_inner(box fmt::format_strbuf(msg), file, line)
+    begin_unwind_inner(box fmt::format(msg), file, line)
 }
 
 /// This is the entry point of unwinding for fail!() and assert!().
diff --git a/src/libstd/str.rs b/src/libstd/str.rs
index 9e15612c72b..b80b2581e08 100644
--- a/src/libstd/str.rs
+++ b/src/libstd/str.rs
@@ -2123,7 +2123,7 @@ mod tests {
         assert_eq!(s.len(), 5);
         assert_eq!(s.as_slice(), "abcde");
         assert_eq!(s.to_str(), "abcde".to_string());
-        assert_eq!(format_strbuf!("{}", s), "abcde".to_string());
+        assert_eq!(format!("{}", s), "abcde".to_string());
         assert!(s.lt(&Owned("bcdef".to_string())));
         assert_eq!(Slice(""), Default::default());
 
@@ -2131,7 +2131,7 @@ mod tests {
         assert_eq!(o.len(), 5);
         assert_eq!(o.as_slice(), "abcde");
         assert_eq!(o.to_str(), "abcde".to_string());
-        assert_eq!(format_strbuf!("{}", o), "abcde".to_string());
+        assert_eq!(format!("{}", o), "abcde".to_string());
         assert!(o.lt(&Slice("bcdef")));
         assert_eq!(Owned("".to_string()), Default::default());
 
diff --git a/src/libstd/to_str.rs b/src/libstd/to_str.rs
index c2100111e12..3b223b68ee6 100644
--- a/src/libstd/to_str.rs
+++ b/src/libstd/to_str.rs
@@ -31,7 +31,7 @@ pub trait IntoStr {
 
 impl<T: fmt::Show> ToStr for T {
     fn to_str(&self) -> String {
-        format_strbuf!("{}", *self)
+        format!("{}", *self)
     }
 }
 
diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index f21239af6af..c05fc8ce6d9 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -895,8 +895,8 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt, sp: Span,
     match parser.errors.shift() {
         Some(error) => {
             cx.ecx.span_err(efmt.span,
-                            format_strbuf!("invalid format string: {}",
-                                           error).as_slice());
+                            format!("invalid format string: {}",
+                                    error).as_slice());
             return DummyResult::raw_expr(sp);
         }
         None => {}
diff --git a/src/libterm/terminfo/parm.rs b/src/libterm/terminfo/parm.rs
index db9509a9dd2..3da8d7672f5 100644
--- a/src/libterm/terminfo/parm.rs
+++ b/src/libterm/terminfo/parm.rs
@@ -281,9 +281,7 @@ pub fn expand(cap: &[u8], params: &[Param], vars: &mut Variables)
                     ';' => (),
 
                     _ => {
-                        return Err(format_strbuf!("unrecognized format \
-                                                   option {}",
-                                                  cur))
+                        return Err(format!("unrecognized format option {}", cur))
                     }
                 }
             },
@@ -549,8 +547,8 @@ fn format(val: Param, op: FormatOp, flags: Flags) -> Result<Vec<u8> ,String> {
                     s
                 }
                 _ => {
-                    return Err(format_strbuf!("non-string on stack with %{}",
-                                              op.to_char()))
+                    return Err(format!("non-string on stack with %{}",
+                                       op.to_char()))
                 }
             }
         }
diff --git a/src/libterm/terminfo/parser/compiled.rs b/src/libterm/terminfo/parser/compiled.rs
index 1a42addb4bd..b155753191c 100644
--- a/src/libterm/terminfo/parser/compiled.rs
+++ b/src/libterm/terminfo/parser/compiled.rs
@@ -164,7 +164,7 @@ pub fn parse(file: &mut io::Reader, longnames: bool)
     macro_rules! try( ($e:expr) => (
         match $e {
             Ok(e) => e,
-            Err(e) => return Err(format_strbuf!("{}", e))
+            Err(e) => return Err(format!("{}", e))
         }
     ) )
 
@@ -185,10 +185,8 @@ pub fn parse(file: &mut io::Reader, longnames: bool)
     // Check magic number
     let magic = try!(file.read_le_u16());
     if magic != 0x011A {
-        return Err(format_strbuf!("invalid magic number: expected {:x} but \
-                                   found {:x}",
-                                  0x011A,
-                                  magic as uint));
+        return Err(format!("invalid magic number: expected {:x} but found {:x}",
+                           0x011A, magic as uint));
     }
 
     let names_bytes          = try!(file.read_le_i16()) as int;
diff --git a/src/libterm/terminfo/searcher.rs b/src/libterm/terminfo/searcher.rs
index 84f0a4e3565..6b8ebb670e7 100644
--- a/src/libterm/terminfo/searcher.rs
+++ b/src/libterm/terminfo/searcher.rs
@@ -81,11 +81,11 @@ pub fn open(term: &str) -> Result<File, String> {
         Some(x) => {
             match File::open(x) {
                 Ok(file) => Ok(file),
-                Err(e) => Err(format_strbuf!("error opening file: {}", e)),
+                Err(e) => Err(format!("error opening file: {}", e)),
             }
         }
         None => {
-            Err(format_strbuf!("could not find terminfo entry for {}", term))
+            Err(format!("could not find terminfo entry for {}", term))
         }
     }
 }
diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index f02bc144d15..1de7f90c806 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -374,7 +374,7 @@ pub fn parse_opts(args: &[String]) -> Option<OptRes> {
         let s = matches.free.get(0).as_slice();
         match Regex::new(s) {
             Ok(re) => Some(re),
-            Err(e) => return Some(Err(format_strbuf!("could not parse /{}/: {}", s, e)))
+            Err(e) => return Some(Err(format!("could not parse /{}/: {}", s, e)))
         }
     } else {
         None
@@ -739,22 +739,20 @@ impl<T: Writer> ConsoleTestState<T> {
 pub fn fmt_metrics(mm: &MetricMap) -> String {
     let MetricMap(ref mm) = *mm;
     let v : Vec<String> = mm.iter()
-        .map(|(k,v)| format_strbuf!("{}: {} (+/- {})",
-                          *k,
-                          v.value as f64,
-                          v.noise as f64))
+        .map(|(k,v)| format!("{}: {} (+/- {})", *k,
+                             v.value as f64, v.noise as f64))
         .collect();
     v.connect(", ").to_string()
 }
 
 pub fn fmt_bench_samples(bs: &BenchSamples) -> String {
     if bs.mb_s != 0 {
-        format_strbuf!("{:>9} ns/iter (+/- {}) = {} MB/s",
+        format!("{:>9} ns/iter (+/- {}) = {} MB/s",
              bs.ns_iter_summ.median as uint,
              (bs.ns_iter_summ.max - bs.ns_iter_summ.min) as uint,
              bs.mb_s)
     } else {
-        format_strbuf!("{:>9} ns/iter (+/- {})",
+        format!("{:>9} ns/iter (+/- {})",
              bs.ns_iter_summ.median as uint,
              (bs.ns_iter_summ.max - bs.ns_iter_summ.min) as uint)
     }
diff --git a/src/libtime/lib.rs b/src/libtime/lib.rs
index 9b5bbbadc9c..e9b20c0117d 100644
--- a/src/libtime/lib.rs
+++ b/src/libtime/lib.rs
@@ -363,7 +363,7 @@ impl Tm {
             let mut m = num::abs(self.tm_gmtoff) / 60_i32;
             let h = m / 60_i32;
             m -= h * 60_i32;
-            format_strbuf!("{}{}{:02d}:{:02d}", s, sign, h as int, m as int)
+            format!("{}{}{:02d}:{:02d}", s, sign, h as int, m as int)
         }
     }
 }
@@ -469,7 +469,7 @@ pub fn strptime(s: &str, format: &str) -> Result<Tm, String> {
         if c == range.ch {
             Ok(range.next)
         } else {
-            Err(format_strbuf!("Expected {}, found {}",
+            Err(format!("Expected {}, found {}",
                 str::from_char(c),
                 str::from_char(range.ch)))
         }
@@ -772,8 +772,7 @@ pub fn strptime(s: &str, format: &str) -> Result<Tm, String> {
           }
           '%' => parse_char(s, pos, '%'),
           ch => {
-            Err(format_strbuf!("unknown formatting type: {}",
-                               str::from_char(ch)))
+            Err(format!("unknown formatting type: {}", str::from_char(ch)))
           }
         }
     }
@@ -889,16 +888,16 @@ pub fn strftime(format: &str, tm: &Tm) -> String {
         }
 
         match ch {
-            'G' => format_strbuf!("{}", year),
-            'g' => format_strbuf!("{:02d}", (year % 100 + 100) % 100),
-            'V' => format_strbuf!("{:02d}", days / 7 + 1),
+            'G' => format!("{}", year),
+            'g' => format!("{:02d}", (year % 100 + 100) % 100),
+            'V' => format!("{:02d}", days / 7 + 1),
             _ => "".to_string()
         }
     }
 
     fn parse_type(ch: char, tm: &Tm) -> String {
       let die = || {
-          format_strbuf!("strftime: can't understand this format {} ", ch)
+          format!("strftime: can't understand this format {} ", ch)
       };
         match ch {
           'A' => match tm.tm_wday as int {
@@ -951,9 +950,9 @@ pub fn strftime(format: &str, tm: &Tm) -> String {
             11 => "Dec".to_string(),
             _  => die()
           },
-          'C' => format_strbuf!("{:02d}", (tm.tm_year as int + 1900) / 100),
+          'C' => format!("{:02d}", (tm.tm_year as int + 1900) / 100),
           'c' => {
-            format_strbuf!("{} {} {} {} {}",
+            format!("{} {} {} {} {}",
                 parse_type('a', tm),
                 parse_type('b', tm),
                 parse_type('e', tm),
@@ -961,89 +960,89 @@ pub fn strftime(format: &str, tm: &Tm) -> String {
                 parse_type('Y', tm))
           }
           'D' | 'x' => {
-            format_strbuf!("{}/{}/{}",
+            format!("{}/{}/{}",
                 parse_type('m', tm),
                 parse_type('d', tm),
                 parse_type('y', tm))
           }
-          'd' => format_strbuf!("{:02d}", tm.tm_mday),
-          'e' => format_strbuf!("{:2d}", tm.tm_mday),
-          'f' => format_strbuf!("{:09d}", tm.tm_nsec),
+          'd' => format!("{:02d}", tm.tm_mday),
+          'e' => format!("{:2d}", tm.tm_mday),
+          'f' => format!("{:09d}", tm.tm_nsec),
           'F' => {
-            format_strbuf!("{}-{}-{}",
+            format!("{}-{}-{}",
                 parse_type('Y', tm),
                 parse_type('m', tm),
                 parse_type('d', tm))
           }
           'G' => iso_week('G', tm),
           'g' => iso_week('g', tm),
-          'H' => format_strbuf!("{:02d}", tm.tm_hour),
+          'H' => format!("{:02d}", tm.tm_hour),
           'I' => {
             let mut h = tm.tm_hour;
             if h == 0 { h = 12 }
             if h > 12 { h -= 12 }
-            format_strbuf!("{:02d}", h)
+            format!("{:02d}", h)
           }
-          'j' => format_strbuf!("{:03d}", tm.tm_yday + 1),
-          'k' => format_strbuf!("{:2d}", tm.tm_hour),
+          'j' => format!("{:03d}", tm.tm_yday + 1),
+          'k' => format!("{:2d}", tm.tm_hour),
           'l' => {
             let mut h = tm.tm_hour;
             if h == 0 { h = 12 }
             if h > 12 { h -= 12 }
-            format_strbuf!("{:2d}", h)
+            format!("{:2d}", h)
           }
-          'M' => format_strbuf!("{:02d}", tm.tm_min),
-          'm' => format_strbuf!("{:02d}", tm.tm_mon + 1),
+          'M' => format!("{:02d}", tm.tm_min),
+          'm' => format!("{:02d}", tm.tm_mon + 1),
           'n' => "\n".to_string(),
           'P' => if (tm.tm_hour as int) < 12 { "am".to_string() } else { "pm".to_string() },
           'p' => if (tm.tm_hour as int) < 12 { "AM".to_string() } else { "PM".to_string() },
           'R' => {
-            format_strbuf!("{}:{}",
+            format!("{}:{}",
                 parse_type('H', tm),
                 parse_type('M', tm))
           }
           'r' => {
-            format_strbuf!("{}:{}:{} {}",
+            format!("{}:{}:{} {}",
                 parse_type('I', tm),
                 parse_type('M', tm),
                 parse_type('S', tm),
                 parse_type('p', tm))
           }
-          'S' => format_strbuf!("{:02d}", tm.tm_sec),
-          's' => format_strbuf!("{}", tm.to_timespec().sec),
+          'S' => format!("{:02d}", tm.tm_sec),
+          's' => format!("{}", tm.to_timespec().sec),
           'T' | 'X' => {
-            format_strbuf!("{}:{}:{}",
+            format!("{}:{}:{}",
                 parse_type('H', tm),
                 parse_type('M', tm),
                 parse_type('S', tm))
           }
           't' => "\t".to_string(),
-          'U' => format_strbuf!("{:02d}", (tm.tm_yday - tm.tm_wday + 7) / 7),
+          'U' => format!("{:02d}", (tm.tm_yday - tm.tm_wday + 7) / 7),
           'u' => {
             let i = tm.tm_wday as int;
             (if i == 0 { 7 } else { i }).to_str().to_string()
           }
           'V' => iso_week('V', tm),
           'v' => {
-            format_strbuf!("{}-{}-{}",
+            format!("{}-{}-{}",
                 parse_type('e', tm),
                 parse_type('b', tm),
                 parse_type('Y', tm))
           }
           'W' => {
-              format_strbuf!("{:02d}",
+              format!("{:02d}",
                              (tm.tm_yday - (tm.tm_wday - 1 + 7) % 7 + 7) / 7)
           }
           'w' => (tm.tm_wday as int).to_str().to_string(),
           'Y' => (tm.tm_year as int + 1900).to_str().to_string(),
-          'y' => format_strbuf!("{:02d}", (tm.tm_year as int + 1900) % 100),
+          'y' => format!("{:02d}", (tm.tm_year as int + 1900) % 100),
           'Z' => "".to_string(),    // FIXME(pcwalton): Implement this.
           'z' => {
             let sign = if tm.tm_gmtoff > 0_i32 { '+' } else { '-' };
             let mut m = num::abs(tm.tm_gmtoff) / 60_i32;
             let h = m / 60_i32;
             m -= h * 60_i32;
-            format_strbuf!("{}{:02d}{:02d}", sign, h, m)
+            format!("{}{:02d}{:02d}", sign, h, m)
           }
           '+' => tm.rfc3339(),
           '%' => "%".to_string(),
diff --git a/src/libuuid/lib.rs b/src/libuuid/lib.rs
index a9c80c90fd6..99dd7d8503c 100644
--- a/src/libuuid/lib.rs
+++ b/src/libuuid/lib.rs
@@ -346,8 +346,8 @@ impl Uuid {
         uf.data1 = to_be32(uf.data1);
         uf.data2 = to_be16(uf.data2);
         uf.data3 = to_be16(uf.data3);
-        let s = format_strbuf!("{:08x}-{:04x}-{:04x}-{:02x}{:02x}-\
-                                {:02x}{:02x}{:02x}{:02x}{:02x}{:02x}",
+        let s = format!("{:08x}-{:04x}-{:04x}-{:02x}{:02x}-\
+                         {:02x}{:02x}{:02x}{:02x}{:02x}{:02x}",
             uf.data1,
             uf.data2, uf.data3,
             uf.data4[0], uf.data4[1],
@@ -362,7 +362,7 @@ impl Uuid {
     ///
     /// Example: `urn:uuid:F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4`
     pub fn to_urn_str(&self) -> String {
-        format_strbuf!("urn:uuid:{}", self.to_hyphenated_str())
+        format!("urn:uuid:{}", self.to_hyphenated_str())
     }
 
     /// Parses a UUID from a string of hexadecimal digits with optional hyphens
diff --git a/src/test/bench/shootout-binarytrees.rs b/src/test/bench/shootout-binarytrees.rs
index db68edc73ba..1dc52166965 100644
--- a/src/test/bench/shootout-binarytrees.rs
+++ b/src/test/bench/shootout-binarytrees.rs
@@ -74,8 +74,8 @@ fn main() {
                     let b = bottom_up_tree(&arena, -i, depth);
                     chk += item_check(a) + item_check(b);
                 }
-                format_strbuf!("{}\t trees of depth {}\t check: {}",
-                               iterations * 2, depth, chk)
+                format!("{}\t trees of depth {}\t check: {}",
+                        iterations * 2, depth, chk)
             })
         }).collect::<Vec<Future<String>>>();
 
diff --git a/src/test/bench/shootout-chameneos-redux.rs b/src/test/bench/shootout-chameneos-redux.rs
index 2c8b23f2acd..baf02feb5b8 100644
--- a/src/test/bench/shootout-chameneos-redux.rs
+++ b/src/test/bench/shootout-chameneos-redux.rs
@@ -134,9 +134,7 @@ fn creature(
         }
     }
     // log creatures met and evil clones of self
-    let report = format_strbuf!("{}{}",
-                                creatures_met,
-                                Number(evil_clones_met));
+    let report = format!("{}{}", creatures_met, Number(evil_clones_met));
     to_rendezvous_log.send(report);
 }
 
diff --git a/src/test/bench/shootout-k-nucleotide-pipes.rs b/src/test/bench/shootout-k-nucleotide-pipes.rs
index 8be6439d88c..e39c51dd73a 100644
--- a/src/test/bench/shootout-k-nucleotide-pipes.rs
+++ b/src/test/bench/shootout-k-nucleotide-pipes.rs
@@ -129,11 +129,11 @@ fn make_sequence_processor(sz: uint,
    let buffer = match sz {
        1u => { sort_and_fmt(&freqs, total) }
        2u => { sort_and_fmt(&freqs, total) }
-       3u => { format_strbuf!("{}\t{}", find(&freqs, "GGT".to_string()), "GGT") }
-       4u => { format_strbuf!("{}\t{}", find(&freqs, "GGTA".to_string()), "GGTA") }
-       6u => { format_strbuf!("{}\t{}", find(&freqs, "GGTATT".to_string()), "GGTATT") }
-      12u => { format_strbuf!("{}\t{}", find(&freqs, "GGTATTTTAATT".to_string()), "GGTATTTTAATT") }
-      18u => { format_strbuf!("{}\t{}", find(&freqs, "GGTATTTTAATTTATAGT".to_string()),
+       3u => { format!("{}\t{}", find(&freqs, "GGT".to_string()), "GGT") }
+       4u => { format!("{}\t{}", find(&freqs, "GGTA".to_string()), "GGTA") }
+       6u => { format!("{}\t{}", find(&freqs, "GGTATT".to_string()), "GGTATT") }
+      12u => { format!("{}\t{}", find(&freqs, "GGTATTTTAATT".to_string()), "GGTATTTTAATT") }
+      18u => { format!("{}\t{}", find(&freqs, "GGTATTTTAATTTATAGT".to_string()),
                        "GGTATTTTAATTTATAGT") }
         _ => { "".to_string() }
    };
diff --git a/src/test/compile-fail/issue-13428.rs b/src/test/compile-fail/issue-13428.rs
index 85bad9f8d60..de558401aa6 100644
--- a/src/test/compile-fail/issue-13428.rs
+++ b/src/test/compile-fail/issue-13428.rs
@@ -11,8 +11,8 @@
 // Regression test for #13428
 
 fn foo() -> String {  //~ ERROR not all control paths return a value
-    format_strbuf!("Hello {}",
-                   "world")
+    format!("Hello {}",
+            "world")
     // Put the trailing semicolon on its own line to test that the
     // note message gets the offending semicolon exactly
     ;   //~ NOTE consider removing this semicolon
diff --git a/src/test/run-fail/explicit-fail-msg.rs b/src/test/run-fail/explicit-fail-msg.rs
index 9160b760c92..f860fdffba1 100644
--- a/src/test/run-fail/explicit-fail-msg.rs
+++ b/src/test/run-fail/explicit-fail-msg.rs
@@ -15,5 +15,5 @@
 fn main() {
     let mut a = 1;
     if 1 == 1 { a = 2; }
-    fail!(format_strbuf!("woooo{}", "o"));
+    fail!(format!("woooo{}", "o"));
 }
diff --git a/src/test/run-fail/unwind-lambda.rs b/src/test/run-fail/unwind-lambda.rs
index 00183aa674f..336df3ff965 100644
--- a/src/test/run-fail/unwind-lambda.rs
+++ b/src/test/run-fail/unwind-lambda.rs
@@ -20,10 +20,10 @@ fn main() {
         macerate((*tasties).clone());
     });
     result(carrots, |food| {
-        let mush = format_strbuf!("{}{}", food, cheese);
+        let mush = format!("{}{}", food, cheese);
         let cheese = cheese.clone();
         let f: || = || {
-            let _chew = format_strbuf!("{}{}", mush, cheese);
+            let _chew = format!("{}{}", mush, cheese);
             fail!("so yummy")
         };
         f();
diff --git a/src/test/run-pass/autoref-intermediate-types-issue-3585.rs b/src/test/run-pass/autoref-intermediate-types-issue-3585.rs
index e10428e3c5d..270f85114ea 100644
--- a/src/test/run-pass/autoref-intermediate-types-issue-3585.rs
+++ b/src/test/run-pass/autoref-intermediate-types-issue-3585.rs
@@ -16,13 +16,13 @@ trait Foo {
 
 impl<T:Foo> Foo for @T {
     fn foo(&self) -> String {
-        format_strbuf!("@{}", (**self).foo())
+        format!("@{}", (**self).foo())
     }
 }
 
 impl Foo for uint {
     fn foo(&self) -> String {
-        format_strbuf!("{}", *self)
+        format!("{}", *self)
     }
 }
 
diff --git a/src/test/run-pass/bug-7183-generics.rs b/src/test/run-pass/bug-7183-generics.rs
index 7ed5f5aef9f..239247cdd18 100644
--- a/src/test/run-pass/bug-7183-generics.rs
+++ b/src/test/run-pass/bug-7183-generics.rs
@@ -19,15 +19,15 @@ fn hello<S:Speak>(s:&S) -> String{
 
 impl Speak for int {
     fn say(&self, s:&str) -> String {
-        format_strbuf!("{}: {}", s, *self)
+        format!("{}: {}", s, *self)
     }
 }
 
 impl<T: Speak> Speak for Option<T> {
     fn say(&self, s:&str) -> String {
         match *self {
-            None => format_strbuf!("{} - none", s),
-            Some(ref x) => { format_strbuf!("something!{}", x.say(s)) }
+            None => format!("{} - none", s),
+            Some(ref x) => { format!("something!{}", x.say(s)) }
         }
     }
 }
diff --git a/src/test/run-pass/closure-reform.rs b/src/test/run-pass/closure-reform.rs
index 5de7aee4aa4..c05f2502a89 100644
--- a/src/test/run-pass/closure-reform.rs
+++ b/src/test/run-pass/closure-reform.rs
@@ -50,15 +50,15 @@ pub fn main() {
 
     let greeting = "Hello ".to_string();
     call_it(proc(s) {
-        format_strbuf!("{}{}", greeting, s)
+        format!("{}{}", greeting, s)
     });
 
     let greeting = "Goodbye ".to_string();
-    call_it(proc(s) format_strbuf!("{}{}", greeting, s));
+    call_it(proc(s) format!("{}{}", greeting, s));
 
     let greeting = "How's life, ".to_string();
     call_it(proc(s: String) -> String {
-        format_strbuf!("{}{}", greeting, s)
+        format!("{}{}", greeting, s)
     });
 
     // Closures
diff --git a/src/test/run-pass/issue-2804.rs b/src/test/run-pass/issue-2804.rs
index fa5cd972029..4e5dea82cf4 100644
--- a/src/test/run-pass/issue-2804.rs
+++ b/src/test/run-pass/issue-2804.rs
@@ -45,7 +45,7 @@ fn add_interface(_store: int, managed_ip: String, data: json::Json) -> (String,
             let name = lookup((*interface).clone(),
                               "ifDescr".to_string(),
                               "".to_string());
-            let label = format_strbuf!("{}-{}", managed_ip, name);
+            let label = format!("{}-{}", managed_ip, name);
 
             (label, bool_value(false))
         }
diff --git a/src/test/run-pass/issue-8898.rs b/src/test/run-pass/issue-8898.rs
index ac0ac95c73b..323fff76efb 100644
--- a/src/test/run-pass/issue-8898.rs
+++ b/src/test/run-pass/issue-8898.rs
@@ -13,7 +13,7 @@
 extern crate debug;
 
 fn assert_repr_eq<T>(obj : T, expected : String) {
-    assert_eq!(expected, format_strbuf!("{:?}", obj));
+    assert_eq!(expected, format!("{:?}", obj));
 }
 
 pub fn main() {
diff --git a/src/test/run-pass/log-knows-the-names-of-variants-in-std.rs b/src/test/run-pass/log-knows-the-names-of-variants-in-std.rs
index d26075af3ce..cb7a5989430 100644
--- a/src/test/run-pass/log-knows-the-names-of-variants-in-std.rs
+++ b/src/test/run-pass/log-knows-the-names-of-variants-in-std.rs
@@ -17,19 +17,19 @@ enum foo {
 }
 
 fn check_log<T>(exp: String, v: T) {
-    assert_eq!(exp, format_strbuf!("{:?}", v));
+    assert_eq!(exp, format!("{:?}", v));
 }
 
 pub fn main() {
     let mut x = Some(a(22u));
     let exp = "Some(a(22u))".to_string();
-    let act = format_strbuf!("{:?}", x);
+    let act = format!("{:?}", x);
     assert_eq!(act, exp);
     check_log(exp, x);
 
     x = None;
     let exp = "None".to_string();
-    let act = format_strbuf!("{:?}", x);
+    let act = format!("{:?}", x);
     assert_eq!(act, exp);
     check_log(exp, x);
 }
diff --git a/src/test/run-pass/log-knows-the-names-of-variants.rs b/src/test/run-pass/log-knows-the-names-of-variants.rs
index 2956a030faa..e6a23d99290 100644
--- a/src/test/run-pass/log-knows-the-names-of-variants.rs
+++ b/src/test/run-pass/log-knows-the-names-of-variants.rs
@@ -21,7 +21,7 @@ enum bar {
 }
 
 pub fn main() {
-    assert_eq!("a(22u)".to_string(), format_strbuf!("{:?}", a(22u)));
-    assert_eq!("c".to_string(), format_strbuf!("{:?}", c));
-    assert_eq!("d".to_string(), format_strbuf!("{:?}", d));
+    assert_eq!("a(22u)".to_string(), format!("{:?}", a(22u)));
+    assert_eq!("c".to_string(), format!("{:?}", c));
+    assert_eq!("d".to_string(), format!("{:?}", d));
 }
diff --git a/src/test/run-pass/match-borrowed_str.rs b/src/test/run-pass/match-borrowed_str.rs
index a74f3e83326..b359614fa9a 100644
--- a/src/test/run-pass/match-borrowed_str.rs
+++ b/src/test/run-pass/match-borrowed_str.rs
@@ -22,7 +22,7 @@ fn f2(ref_string: &str) -> String {
     match ref_string {
         "a" => "found a".to_string(),
         "b" => "found b".to_string(),
-        s => format_strbuf!("not found ({})", s)
+        s => format!("not found ({})", s)
     }
 }
 
@@ -38,7 +38,7 @@ fn g2(ref_1: &str, ref_2: &str) -> String {
     match (ref_1, ref_2) {
         ("a", "b") => "found a,b".to_string(),
         ("b", "c") => "found b,c".to_string(),
-        (s1, s2) => format_strbuf!("not found ({}, {})", s1, s2)
+        (s1, s2) => format!("not found ({}, {})", s1, s2)
     }
 }
 
diff --git a/src/test/run-pass/monad.rs b/src/test/run-pass/monad.rs
index 4642978d46c..3ad5da31701 100644
--- a/src/test/run-pass/monad.rs
+++ b/src/test/run-pass/monad.rs
@@ -45,8 +45,8 @@ pub fn main() {
     assert_eq!(transform(Some(10)), Some("11".to_string()));
     assert_eq!(transform(None), None);
     assert!((vec!("hi".to_string()))
-        .bind(|x| vec!(x.clone(), format_strbuf!("{}!", x)) )
-        .bind(|x| vec!(x.clone(), format_strbuf!("{}?", x)) ) ==
+        .bind(|x| vec!(x.clone(), format!("{}!", x)) )
+        .bind(|x| vec!(x.clone(), format!("{}?", x)) ) ==
         vec!("hi".to_string(),
              "hi?".to_string(),
              "hi!".to_string(),
diff --git a/src/test/run-pass/process-spawn-with-unicode-params.rs b/src/test/run-pass/process-spawn-with-unicode-params.rs
index 0bfa2a75cf5..70839c18847 100644
--- a/src/test/run-pass/process-spawn-with-unicode-params.rs
+++ b/src/test/run-pass/process-spawn-with-unicode-params.rs
@@ -36,8 +36,7 @@ fn main() {
     let blah       = "\u03c0\u042f\u97f3\u00e6\u221e";
 
     let child_name = "child";
-    let child_dir  = format_strbuf!("process-spawn-with-unicode-params-{}",
-                                    blah);
+    let child_dir  = format!("process-spawn-with-unicode-params-{}", blah);
 
     // parameters sent to child / expected to be received from parent
     let arg = blah;
diff --git a/src/test/run-pass/send_str_treemap.rs b/src/test/run-pass/send_str_treemap.rs
index 9c727314ffb..5604093ea9c 100644
--- a/src/test/run-pass/send_str_treemap.rs
+++ b/src/test/run-pass/send_str_treemap.rs
@@ -61,7 +61,7 @@ pub fn main() {
     assert_eq!(map.find(&Owned("def".to_string())), Some(&d));
 
     assert!(map.pop(&Slice("foo")).is_some());
-    assert_eq!(map.move_iter().map(|(k, v)| format_strbuf!("{}{}", k, v))
+    assert_eq!(map.move_iter().map(|(k, v)| format!("{}{}", k, v))
                               .collect::<Vec<String>>()
                               .concat(),
                "abc50bcd51cde52def53".to_string());
diff --git a/src/test/run-pass/str-concat.rs b/src/test/run-pass/str-concat.rs
index 51831a7b1cd..7141d0b9df5 100644
--- a/src/test/run-pass/str-concat.rs
+++ b/src/test/run-pass/str-concat.rs
@@ -14,7 +14,7 @@
 pub fn main() {
     let a: String = "hello".to_string();
     let b: String = "world".to_string();
-    let s: String = format_strbuf!("{}{}", a, b);
+    let s: String = format!("{}{}", a, b);
     println!("{}", s.clone());
     assert_eq!(s.as_slice()[9], 'd' as u8);
 }
diff --git a/src/test/run-pass/string-self-append.rs b/src/test/run-pass/string-self-append.rs
index 4610d1ccfcc..612483f6909 100644
--- a/src/test/run-pass/string-self-append.rs
+++ b/src/test/run-pass/string-self-append.rs
@@ -16,7 +16,7 @@ pub fn main() {
     while i > 0 {
         println!("{}", a.len());
         assert_eq!(a.len(), expected_len);
-        a = format_strbuf!("{}{}", a, a);
+        a = format!("{}{}", a, a);
         i -= 1;
         expected_len *= 2u;
     }
diff --git a/src/test/run-pass/trait-cast.rs b/src/test/run-pass/trait-cast.rs
index 7f0f857090f..454cf4c8eda 100644
--- a/src/test/run-pass/trait-cast.rs
+++ b/src/test/run-pass/trait-cast.rs
@@ -29,7 +29,7 @@ impl<T:to_str> to_str for Option<T> {
     fn to_str_(&self) -> String {
         match *self {
           None => { "none".to_string() }
-          Some(ref t) => format_strbuf!("some({})", t.to_str_()),
+          Some(ref t) => format!("some({})", t.to_str_()),
         }
     }
 }
@@ -46,10 +46,7 @@ impl to_str for Tree {
         let this = t.borrow();
         let (l, r) = (this.left, this.right);
         let val = &this.val;
-        format_strbuf!("[{}, {}, {}]",
-                       val.to_str_(),
-                       l.to_str_(),
-                       r.to_str_())
+        format!("[{}, {}, {}]", val.to_str_(), l.to_str_(), r.to_str_())
     }
 }
 
diff --git a/src/test/run-pass/trait-to-str.rs b/src/test/run-pass/trait-to-str.rs
index 7fe5b327f2f..ea5e0a9ee91 100644
--- a/src/test/run-pass/trait-to-str.rs
+++ b/src/test/run-pass/trait-to-str.rs
@@ -20,11 +20,11 @@ impl to_str for int {
 
 impl<T:to_str> to_str for Vec<T> {
     fn to_string(&self) -> String {
-        format_strbuf!("[{}]",
-                       self.iter()
-                           .map(|e| e.to_string())
-                           .collect::<Vec<String>>()
-                           .connect(", "))
+        format!("[{}]",
+                self.iter()
+                    .map(|e| e.to_string())
+                    .collect::<Vec<String>>()
+                    .connect(", "))
     }
 }
 
@@ -33,7 +33,7 @@ pub fn main() {
     assert!((vec!(2, 3, 4)).to_string() == "[2, 3, 4]".to_string());
 
     fn indirect<T:to_str>(x: T) -> String {
-        format_strbuf!("{}!", x.to_string())
+        format!("{}!", x.to_string())
     }
     assert!(indirect(vec!(10, 20)) == "[10, 20]!".to_string());
 
diff --git a/src/test/run-pass/traits-default-method-macro.rs b/src/test/run-pass/traits-default-method-macro.rs
index 8b0d8533c56..29fc2fd5a7a 100644
--- a/src/test/run-pass/traits-default-method-macro.rs
+++ b/src/test/run-pass/traits-default-method-macro.rs
@@ -11,7 +11,7 @@
 
 trait Foo {
     fn bar(&self) -> String {
-        format_strbuf!("test")
+        format!("test")
     }
 }