compiler fatal error in switch.

fixes #867.

R=rsc
CC=golang-dev
https://golang.org/cl/1691045

diff --git a/src/cmd/gc/swt.c b/src/cmd/gc/swt.c
index 2ed8216bc0d7ec9b29de598568a6f3371a817c1a..fbc9c49030a66de129bda4af85427edb5fd9a231 100644 (file)
--- 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