mirror of
https://github.com/golang/go
synced 2024-11-12 03:00:22 -07:00
4bdf1fc02b
Add copyright notice to nilptr.go. R=golang-dev, r CC=golang-dev https://golang.org/cl/5139048
55 lines
782 B
Go
55 lines
782 B
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
|
|
|
|
// 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
|
|
|
|
type T struct {a, b int};
|
|
|
|
func println(x, y int) { }
|
|
|
|
func f(x interface{}) interface{} {
|
|
type T struct {a, b int};
|
|
|
|
if x == nil {
|
|
return T{2, 3};
|
|
}
|
|
|
|
t := x.(T);
|
|
println(t.a, t.b);
|
|
return x;
|
|
}
|
|
|
|
func main() {
|
|
inner_T := f(nil);
|
|
f(inner_T);
|
|
|
|
shouldPanic(p1)
|
|
}
|
|
|
|
func p1() {
|
|
outer_T := T{5, 7};
|
|
f(outer_T);
|
|
}
|
|
|
|
func shouldPanic(f func()) {
|
|
defer func() {
|
|
if recover() == nil {
|
|
panic("function should panic")
|
|
}
|
|
}()
|
|
f()
|
|
}
|
|
|
|
/*
|
|
This prints:
|
|
|
|
2 3
|
|
5 7
|
|
|
|
but it should crash: The type assertion on line 18 should fail
|
|
for the 2nd call to f with outer_T.
|
|
*/
|