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 // Interface 10 type I interface { F() int } 11 12 // Implements interface 13 type S struct { } 14 func (s *S) F() int { return 1 } 15 16 // Allocates S but returns I 17 // Arg is unused but important: 18 // if you take it out (and the 0s below) 19 // then the bug goes away. 20 func NewI(i int) I { 21 return new(S) 22 } 23 24 // Uses interface method. 25 func Use(x I) { 26 x.F() 27 } 28 29 func main() { 30 i := NewI(0); 31 Use(i); 32 33 // Again, without temporary 34 // Crashes because x.F is 0. 35 Use(NewI(0)); 36 } 37 38
