p_test.go

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"./p"
     9  	"fmt"
    10  )
    11  
    12  type I interface {
    13  	Add(out *P)
    14  }
    15  
    16  type P struct {
    17  	V *int32
    18  }
    19  
    20  type T struct{}
    21  
    22  var x int32 = 42
    23  
    24  func Int32x(i int32) *int32 {
    25  	return &i
    26  }
    27  
    28  func (T) Add(out *P) {
    29  	out.V = p.Int32(x) // inlined, p.i.2 moved to heap
    30  }
    31  
    32  var PP P
    33  var out *P = &PP
    34  
    35  func F(s I) interface{} {
    36  	s.Add(out) // not inlined.
    37  	return out
    38  }
    39  
    40  var s T
    41  
    42  func main() {
    43  	println("Starting")
    44  	fmt.Sprint(new(int32))
    45  	resp := F(s).(*P)
    46  	println("Before, *resp.V=", *resp.V) // Trashes *resp.V in process of printing.
    47  	println("After,  *resp.V=", *resp.V)
    48  	if got, want := *resp.V, int32(42); got != want {
    49  		fmt.Printf("FAIL, got %v, want %v", got, want)
    50  	}
    51  }
    52
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