| // run |
| |
| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| // Interface |
| type I interface { F() int } |
| |
| // Implements interface |
| type S struct { } |
| func (s *S) F() int { return 1 } |
| |
| // Allocates S but returns I |
| // Arg is unused but important: |
| // if you take it out (and the 0s below) |
| // then the bug goes away. |
| func NewI(i int) I { |
| return new(S) |
| } |
| |
| // Uses interface method. |
| func Use(x I) { |
| x.F() |
| } |
| |
| func main() { |
| i := NewI(0); |
| Use(i); |
| |
| // Again, without temporary |
| // Crashes because x.F is 0. |
| Use(NewI(0)); |
| } |
| |
