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-rw-r--r--test/interface/noeq.go40
1 files changed, 40 insertions, 0 deletions
diff --git a/test/interface/noeq.go b/test/interface/noeq.go
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--- /dev/null
+++ b/test/interface/noeq.go
@@ -0,0 +1,40 @@
+// run
+
+// 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.
+
+// Test run-time error detection for interface values containing types
+// that cannot be compared for equality.
+
+package main
+
+func main() {
+ cmp(1)
+
+ var (
+ m map[int]int
+ s struct{ x []int }
+ 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()
+}