From b02f1f46e550e8f87df6c3ec7f9721b1f4edc958 Mon Sep 17 00:00:00 2001
From: Brian Anderson <banderson@mozilla.com>
Date: Thu, 18 Aug 2011 19:19:38 -0700
Subject: [PATCH] Don't pretty-print trailing whitespace for blank lines inside
 block comments

---
 src/comp/syntax/print/pprust.rs                      | 12 ++++++++++--
 src/test/pretty/block-comment-trailing-whitespace.rs |  8 ++++++++
 .../pretty/block-comment-trailing-whitespace2.rs     |  7 +++++++
 3 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 src/test/pretty/block-comment-trailing-whitespace.rs
 create mode 100644 src/test/pretty/block-comment-trailing-whitespace2.rs

diff --git a/src/comp/syntax/print/pprust.rs b/src/comp/syntax/print/pprust.rs
index 59531683074..a90088f2142 100644
--- a/src/comp/syntax/print/pprust.rs
+++ b/src/comp/syntax/print/pprust.rs
@@ -1537,7 +1537,12 @@ fn print_comment(s: &ps, cmnt: lexer::cmnt) {
       }
       lexer::isolated. {
         pprust::hardbreak_if_not_bol(s);
-        for line: str in cmnt.lines { word(s.s, line); hardbreak(s.s); }
+        for line: str in cmnt.lines {
+            // Don't print empty lines because they will end up as trailing
+            // whitespace
+            if str::is_not_empty(line) { word(s.s, line); }
+            hardbreak(s.s);
+        }
       }
       lexer::trailing. {
         word(s.s, " ");
@@ -1546,7 +1551,10 @@ fn print_comment(s: &ps, cmnt: lexer::cmnt) {
             hardbreak(s.s);
         } else {
             ibox(s, 0u);
-            for line: str in cmnt.lines { word(s.s, line); hardbreak(s.s); }
+            for line: str in cmnt.lines {
+                if str::is_not_empty(line) { word(s.s, line); }
+                hardbreak(s.s);
+            }
             end(s);
         }
       }
diff --git a/src/test/pretty/block-comment-trailing-whitespace.rs b/src/test/pretty/block-comment-trailing-whitespace.rs
new file mode 100644
index 00000000000..80611467c4e
--- /dev/null
+++ b/src/test/pretty/block-comment-trailing-whitespace.rs
@@ -0,0 +1,8 @@
+// pp-exact
+fn f() {
+    /*
+    The next line should not be indented.
+
+    That one. It shouldn't have been indented.
+    */
+}
diff --git a/src/test/pretty/block-comment-trailing-whitespace2.rs b/src/test/pretty/block-comment-trailing-whitespace2.rs
new file mode 100644
index 00000000000..e3f6f891dcb
--- /dev/null
+++ b/src/test/pretty/block-comment-trailing-whitespace2.rs
@@ -0,0 +1,7 @@
+// pp-exact
+fn f() {
+} /*
+  The next line should not be indented.
+
+  That one. It shouldn't have been indented.
+  */