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// $G $D/$F.go && $L $F.$A && ./$A.out

// Copyright 2010 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.

// http://code.google.com/p/go/issues/detail?id=800

package main

var log string

type T int

func (t T) a(s string) T {
        log += "a(" + s + ")"
        return t
}

func (T) b(s string) string {
        log += "b"
        return s
}

type F func(s string) F

func a(s string) F {
        log += "a(" + s + ")"
        return F(a)
}

func b(s string) string {
        log += "b"
        return s
}

type I interface {
        a(s string) I
        b(s string) string
}

type T1 int

func (t T1) a(s string) I {
        log += "a(" + s + ")"
        return t
}

func (T1) b(s string) string {
        log += "b"
        return s
}

var ok = true

func bad() {
        if !ok {
                println("BUG")
                ok = false
        }
        println(log)
}

func main() {
        var t T
        if t.a("1").a(t.b("2")); log != "a(1)ba(2)" {
                bad()
        }
        log = ""
        if a("3")(b("4"))(b("5")); log != "a(3)ba(4)ba(5)" {
                bad()
        }
        log = ""
        var i I = T1(0)
        if i.a("6").a(i.b("7")).a(i.b("8")).a(i.b("9")); log != "a(6)ba(7)ba(8)ba(9)" {
                bad()
        }
}