issue24547.go

     1  // run
     2  
     3  // Copyright 2018 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  // When computing method sets with shadowed methods, make sure we
     8  // compute whether a method promotion involved a pointer traversal
     9  // based on the promoted method, not the shadowed method.
    10  
    11  package main
    12  
    13  import (
    14  	"bytes"
    15  	"fmt"
    16  )
    17  
    18  type mystruct struct {
    19  	f int
    20  }
    21  
    22  func (t mystruct) String() string {
    23  	return "FAIL"
    24  }
    25  
    26  func main() {
    27  	type deep struct {
    28  		mystruct
    29  	}
    30  	s := struct {
    31  		deep
    32  		*bytes.Buffer
    33  	}{
    34  		deep{},
    35  		bytes.NewBufferString("ok"),
    36  	}
    37  
    38  	if got := s.String(); got != "ok" {
    39  		panic(got)
    40  	}
    41  
    42  	var i fmt.Stringer = s
    43  	if got := i.String(); got != "ok" {
    44  		panic(got)
    45  	}
    46  }
    47
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