receiver1.go

     1  // errorcheck
     2  
     3  // Copyright 2009 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  // Verify compiler complains about missing implicit methods.
     8  // Does not compile.
     9  
    10  package main
    11  
    12  type T int
    13  
    14  func (t T) V()
    15  func (t *T) P()
    16  
    17  type V interface {
    18  	V()
    19  }
    20  type P interface {
    21  	P()
    22  	V()
    23  }
    24  
    25  type S struct {
    26  	T
    27  }
    28  type SP struct {
    29  	*T
    30  }
    31  
    32  func main() {
    33  	var t T
    34  	var v V
    35  	var p P
    36  	var s S
    37  	var sp SP
    38  
    39  	v = t
    40  	p = t // ERROR "does not implement|requires a pointer|cannot use"
    41  	_, _ = v, p
    42  	v = &t
    43  	p = &t
    44  	_, _ = v, p
    45  
    46  	v = s
    47  	p = s // ERROR "does not implement|requires a pointer|cannot use"
    48  	_, _ = v, p
    49  	v = &s
    50  	p = &s
    51  	_, _ = v, p
    52  
    53  	v = sp
    54  	p = sp // no error!
    55  	_, _ = v, p
    56  	v = &sp
    57  	p = &sp
    58  	_, _ = v, p
    59  }
    60
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