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      1 // run
      2 
      3 // Copyright 2016 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 package main
      8 
      9 var fail bool
     10 
     11 type Closer interface {
     12 	Close()
     13 }
     14 
     15 func nilInterfaceDeferCall() {
     16 	var x Closer
     17 	defer x.Close()
     18 	// if it panics when evaluating x.Close, it should not reach here
     19 	fail = true
     20 }
     21 
     22 func shouldPanic(f func()) {
     23 	defer func() {
     24 		if recover() == nil {
     25 			panic("did not panic")
     26 		}
     27 	}()
     28 	f()
     29 }
     30 
     31 func main() {
     32 	shouldPanic(nilInterfaceDeferCall)
     33 	if fail {
     34 		panic("fail")
     35 	}
     36 }
     37