bug184.go

     1  // run
     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  package main
     8  
     9  import "fmt"
    10  
    11  type Buffer int
    12  
    13  func (*Buffer) Read() {}
    14  
    15  type Reader interface {
    16  	Read()
    17  }
    18  
    19  func f() *Buffer { return nil }
    20  
    21  func g() Reader {
    22  	// implicit interface conversion in assignment during return
    23  	return f()
    24  }
    25  
    26  func h() (b *Buffer, ok bool) { return }
    27  
    28  func i() (r Reader, ok bool) {
    29  	// implicit interface conversion in multi-assignment during return
    30  	return h()
    31  }
    32  
    33  func fmter() (s string, i int, t string) { return "%#x %q", 100, "hello" }
    34  
    35  func main() {
    36  	b := g()
    37  	bb, ok := b.(*Buffer)
    38  	_, _, _ = b, bb, ok
    39  
    40  	b, ok = i()
    41  	bb, ok = b.(*Buffer)
    42  	_, _, _ = b, bb, ok
    43  
    44  	s := fmt.Sprintf(fmter())
    45  	if s != "0x64 \"hello\"" {
    46  		println(s)
    47  		panic("fail")
    48  	}
    49  }
    50
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