From 2795282b50272b0f4d65513658bda5539d07b8a1 Mon Sep 17 00:00:00 2001
From: Ken Thompson <ken@golang.org>
Date: Mon, 28 Jun 2010 16:30:55 -0700
Subject: [PATCH] compiler fatal error in switch. fixes #867.

R=rsc
CC=golang-dev
https://golang.org/cl/1691045
---
 src/cmd/gc/swt.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/cmd/gc/swt.c b/src/cmd/gc/swt.c
index 2ed8216bc0..fbc9c49030 100644
--- a/src/cmd/gc/swt.c
+++ b/src/cmd/gc/swt.c
@@ -777,11 +777,12 @@ typeswitch(Node *sw)
 		// binary search among cases to narrow by hash
 		cas = list(cas, typebsw(c1, ncase));
 	}
-	
-	cas = list(cas, def);
-	sw->nbody = concat(cas, sw->nbody);
-	sw->list = nil;
-	walkstmtlist(sw->nbody);
+	if(nerrors == 0) {
+		cas = list(cas, def);
+		sw->nbody = concat(cas, sw->nbody);
+		sw->list = nil;
+		walkstmtlist(sw->nbody);
+	}
 }
 
 void