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// $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.

*/