gc: handle invalid name in type switch

Fixes #1453.

R=ken2
CC=golang-dev
https://golang.org/cl/4125043

1 files changed, 13 insertions, 0 deletions

diff --git a/test/syntax/typesw.go b/test/syntax/typesw.go
new file mode 100644
index 0000000000..47f683cdf2
--- /dev/null
+++ b/test/syntax/typesw.go
@@ -0,0 +1,13 @@
+// errchk $G -e $D/$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.
+
+package main
+
+func main() {
+	switch main() := interface{}(nil).(type) {	// ERROR "invalid variable name"
+	default:
+	}
+}