issue19911.go

     1  // run
     2  
     3  // Copyright 2017 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  import (
    10  	"fmt"
    11  	"strings"
    12  )
    13  
    14  type ET struct{}
    15  
    16  func (*ET) Error() string { return "err" }
    17  
    18  func main() {
    19  	check("false", fmt.Sprintf("(*ET)(nil) == error(nil): %v", (*ET)(nil) == error(nil)))
    20  	check("true", fmt.Sprintf("(*ET)(nil) != error(nil): %v", (*ET)(nil) != error(nil)))
    21  
    22  	nilET := (*ET)(nil)
    23  	nilError := error(nil)
    24  
    25  	check("false", fmt.Sprintf("nilET == nilError: %v", nilET == nilError))
    26  	check("true", fmt.Sprintf("nilET != nilError: %v", nilET != nilError))
    27  }
    28  
    29  func check(want, gotfull string) {
    30  	got := gotfull[strings.Index(gotfull, ": ")+len(": "):]
    31  	if got != want {
    32  		panic("want " + want + " got " + got + " from " + gotfull)
    33  	}
    34  }
    35
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