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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 S struct {

        a,b     int;

}

type I1 interface {

        f       ()int;

}

type I2 interface {

        g() int;

        f() int;

}

func (this *S) f()int {

        return this.a;

}

func (this *S) g()int {

        return this.b;

}

func

main() {

        var i1 I1;

        var i2 I2;

        var g *S;

        s := new(S);

        s.a = 5;

        s.b = 6;

        // call structure

        if s.f() != 5 { panic(11); }

        if s.g() != 6 { panic(12); }

        i1 = s;         // convert S to I1

        i2 = i1.(I2);   // convert I1 to I2

        // call interface

        if i1.f() != 5 { panic(21); }

        if i2.f() != 5 { panic(22); }

        if i2.g() != 6 { panic(23); }

        g = i1.(*S);            // convert I1 to S

        if g != s { panic(31); }

        g = i2.(*S);            // convert I2 to S

        if g != s { panic(32); }

}