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      1 // run
      2 
      3 // Copyright 2009 The Go Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style
      5 // license that can be found in the LICENSE file.
      6 
      7 // Test that interface conversion fails when method is missing.
      8 
      9 package main
     10 
     11 type I interface {
     12 	Foo()
     13 }
     14 
     15 func main() {
     16 	shouldPanic(p1)
     17 }
     18 
     19 func p1() {
     20 	var s *S
     21 	var i I
     22 	var e interface{}
     23 	e = s
     24 	i = e.(I)
     25 	_ = i
     26 }
     27 
     28 type S struct{}
     29 
     30 func (s *S) _() {}
     31 
     32 func shouldPanic(f func()) {
     33 	defer func() {
     34 		if recover() == nil {
     35 			panic("function should panic")
     36 		}
     37 	}()
     38 	f()
     39 }
     40