test: add test for function type in function literal

The gccgo compiler used to fail this test.  This was the root
cause of http://gcc.gnu.org/PR61308 .  The fix for the gccgo
compiler is https://golang.org/cl/122020043 .

LGTM=dave, bradfitz
R=golang-codereviews, dave, bradfitz
CC=golang-codereviews
https://golang.org/cl/121200043

diff --git a/test/fixedbugs/bug489.go b/test/fixedbugs/bug489.go
new file mode 100644 (file)
index 0000000..4cf19e0
--- /dev/null
+++ b/test/fixedbugs/bug489.go
@@ -0,0 +1,22 @@
+// compile
+
+// Copyright 2014 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.
+
+// The gccgo compiler had a bug: mentioning a function type in an
+// expression in a function literal messed up the list of variables
+// referenced in enclosing functions.
+
+package main
+
+func main() {
+       v1, v2 := 0, 0
+       f := func() {
+               a := v1
+               g := (func())(nil)
+               b := v2
+               _, _, _ = a, g, b
+       }
+       _, _, _ = v1, v2, f
+}