From 5b46fc417fdc908fd41d1e88a909d8e92a29504c Mon Sep 17 00:00:00 2001
From: David Symonds <dsymonds@golang.org>
Date: Tue, 18 Dec 2012 12:19:04 +1100
Subject: [PATCH] go/doc: add "hdr-" prefix to headers generated from package
 overviews.

R=golang-dev, bradfitz, gri
CC=golang-dev
https://golang.org/cl/6935071
---
 src/pkg/go/doc/comment.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pkg/go/doc/comment.go b/src/pkg/go/doc/comment.go
index 51e2bf7324..c4b7e6ae6e 100644
--- a/src/pkg/go/doc/comment.go
+++ b/src/pkg/go/doc/comment.go
@@ -229,7 +229,8 @@ type block struct {
 var nonAlphaNumRx = regexp.MustCompile(`[^a-zA-Z0-9]`)
 
 func anchorID(line string) string {
-	return nonAlphaNumRx.ReplaceAllString(line, "_")
+	// Add a "hdr-" prefix to avoid conflicting with IDs used for package symbols.
+	return "hdr-" + nonAlphaNumRx.ReplaceAllString(line, "_")
 }
 
 // ToHTML converts comment text to formatted HTML.