bug494.go

     1  // run
     2  
     3  // Copyright 2014 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  // Gccgo incorrectly executed functions multiple times when they
     8  // appeared in a composite literal that required a conversion between
     9  // different interface types.
    10  
    11  package main
    12  
    13  type MyInt int
    14  
    15  var c MyInt
    16  
    17  func (c *MyInt) S(i int) {
    18  	*c = MyInt(i)
    19  }
    20  
    21  func (c *MyInt) V() int {
    22  	return int(*c)
    23  }
    24  
    25  type i1 interface {
    26  	S(int)
    27  	V() int
    28  }
    29  
    30  type i2 interface {
    31  	V() int
    32  }
    33  
    34  type s struct {
    35  	i i2
    36  }
    37  
    38  func f() i1 {
    39  	c++
    40  	return &c
    41  }
    42  
    43  func main() {
    44  	p := &s{f()}
    45  	if v := p.i.V(); v != 1 {
    46  		panic(v)
    47  	}
    48  	if c != 1 {
    49  		panic(c)
    50  	}
    51  }
    52
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