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Source file test/fixedbugs/bug099.go

Documentation: test/fixedbugs

  // 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));
  }
  
  

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