gc: fix type switch error message for invalid cases.

Fixes issue 1606.

R=rsc
CC=golang-dev
http://codereview.appspot.com/4532045

Committer: Russ Cox <rsc@golang.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/test/fixedbugs/bug340.go b/test/fixedbugs/bug340.go
new file mode 100644
index 000000000..461cc6cd4
--- /dev/null
+++ b/test/fixedbugs/bug340.go
@@ -0,0 +1,17 @@
+// errchk $G $D/$F.go
+
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 1606.
+
+package main
+
+func main() {
+	var x interface{}
+	switch t := x.(type) { // ERROR "0 is not a type"
+	case 0:
+		t.x = 1 // ERROR "type interface \{ \}"
+	}
+}