From 71643b2fdbc600fea6498ed20a17ec14bb13a841 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Wed, 27 Jun 2012 17:32:41 -0400
Subject: [PATCH] runtime: fix string optimization

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6354048
---
 src/pkg/runtime/string.goc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/pkg/runtime/string.goc b/src/pkg/runtime/string.goc
index 8a5d59b81d..7cab6d2417 100644
--- a/src/pkg/runtime/string.goc
+++ b/src/pkg/runtime/string.goc
@@ -155,7 +155,9 @@ concatstring(int32 n, String *s)
 			out = s[i];
 		}
 	}
-	if(count <= 1) // zero or one non-empty string in concatenation
+	if(count == 0)
+		return runtime·emptystring;
+	if(count == 1) // zero or one non-empty string in concatenation
 		return out;
 	
 	out = gostringsize(l);
-- 
2.48.1