gc: fix type switch error message for invalid cases.
Fixes #1606.
R=rsc
CC=golang-dev
https://golang.org/cl/4532045
diff --git a/test/fixedbugs/bug340.go b/test/fixedbugs/bug340.go
new file mode 100644
index 0000000..461cc6c
--- /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 \{ \}"
+ }
+}
