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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.
*/