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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); }
}