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-rw-r--r--test/interface/fail.go39
1 files changed, 39 insertions, 0 deletions
diff --git a/test/interface/fail.go b/test/interface/fail.go
new file mode 100644
index 0000000..d40a151
--- /dev/null
+++ b/test/interface/fail.go
@@ -0,0 +1,39 @@
+// run
+
+// Copyright 2009 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 that interface conversion fails when method is missing.
+
+package main
+
+type I interface {
+ Foo()
+}
+
+func main() {
+ shouldPanic(p1)
+}
+
+func p1() {
+ var s *S
+ var i I
+ var e interface{}
+ e = s
+ i = e.(I)
+ _ = i
+}
+
+type S struct{}
+
+func (s *S) _() {}
+
+func shouldPanic(f func()) {
+ defer func() {
+ if recover() == nil {
+ panic("function should panic")
+ }
+ }()
+ f()
+}