gc: disallow map/func equality via interface comparison

Missed when I removed direct map/func equality.

R=ken2
CC=golang-dev
https://golang.org/cl/5452052

1 files changed, 39 insertions, 0 deletions

diff --git a/test/interface/noeq.go b/test/interface/noeq.go
new file mode 100644
index 0000000000..be368218d7
--- /dev/null
+++ b/test/interface/noeq.go
@@ -0,0 +1,39 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: interface/noeq
+
+// 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.
+
+// Interface values containing types that cannot be compared for equality.
+
+package main
+
+func main() {
+	cmp(1)
+	
+	var (
+		m map[int]int
+		s struct{}
+		f func()
+	)
+	noCmp(m)
+	noCmp(s)
+	noCmp(f)
+}
+
+func cmp(x interface{}) bool {
+	return x == x
+}
+
+func noCmp(x interface{}) {
+	shouldPanic(func() { cmp(x) })
+}
+
+func shouldPanic(f func()) {
+	defer func() {
+		if recover() == nil {
+			panic("function should panic")
+		}
+	}()
+	f()
+}