respect goto restrictions

R=gri
CC=golang-dev
https://golang.org/cl/4625044

1 files changed, 7 insertions, 3 deletions

diff --git a/src/pkg/patch/textdiff.go b/src/pkg/patch/textdiff.go
index c7e693fc66..482bd67816 100644
--- a/src/pkg/patch/textdiff.go
+++ b/src/pkg/patch/textdiff.go
@@ -17,6 +17,8 @@ type TextChunk struct {
 }
 
 func ParseTextDiff(raw []byte) (TextDiff, os.Error) {
+	var chunkHeader []byte
+
 	// Copy raw so it is safe to keep references to slices.
 	_, chunks := sections(raw, "@@ -")
 	delta := 0
@@ -26,13 +28,12 @@ func ParseTextDiff(raw []byte) (TextDiff, os.Error) {
 
 		// Parse start line: @@ -oldLine,oldCount +newLine,newCount @@ junk
 		chunk := splitLines(raw)
-		chunkHeader := chunk[0]
+		chunkHeader = chunk[0]
 		var ok bool
 		var oldLine, oldCount, newLine, newCount int
 		s := chunkHeader
 		if oldLine, s, ok = atoi(s, "@@ -", 10); !ok {
-		ErrChunkHdr:
-			return nil, SyntaxError("unexpected chunk header line: " + string(chunkHeader))
+			goto ErrChunkHdr
 		}
 		if len(s) == 0 || s[0] != ',' {
 			oldCount = 1
@@ -145,6 +146,9 @@ func ParseTextDiff(raw []byte) (TextDiff, os.Error) {
 		}
 	}
 	return diff, nil
+
+ErrChunkHdr:
+	return nil, SyntaxError("unexpected chunk header line: " + string(chunkHeader))
 }
 
 var ErrPatchFailure = os.NewError("patch did not apply cleanly")