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      1 // run
      2 
      3 // Copyright 2011 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 run-time error detection for interface values containing types
      8 // that cannot be compared for equality.
      9 
     10 package main
     11 
     12 func main() {
     13 	cmp(1)
     14 
     15 	var (
     16 		m map[int]int
     17 		s struct{ x []int }
     18 		f func()
     19 	)
     20 	noCmp(m)
     21 	noCmp(s)
     22 	noCmp(f)
     23 }
     24 
     25 func cmp(x interface{}) bool {
     26 	return x == x
     27 }
     28 
     29 func noCmp(x interface{}) {
     30 	shouldPanic(func() { cmp(x) })
     31 }
     32 
     33 func shouldPanic(f func()) {
     34 	defer func() {
     35 		if recover() == nil {
     36 			panic("function should panic")
     37 		}
     38 	}()
     39 	f()
     40 }
     41