From: Ken Thompson <ken@golang.org>
Date: Thu, 9 Jul 2009 18:41:06 +0000 (-0700)
Subject: segment fault
X-Git-Tag: weekly.2009-11-06~1200
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=5ff7d8489206e6080f98ba54535ada78db8e4d09;p=gostls13.git

segment fault

R=rsc
OCL=31396
CL=31396
---

diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index 08be5bfcb4..65313bcbce 100644
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -790,6 +790,10 @@ loop:
 		if(top != Erv)
 			goto nottop;
 		walktype(n->left, Erv);
+		if(n->left == N) {
+			yyerror("missing argument to len");
+			goto ret;
+		}
 		defaultlit(n->left, T);
 		implicitstar(&n->left);
 		t = n->left->type;