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// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: interface/noeq

// Copyright 2011 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.

// Interface values containing types that cannot be compared for equality.

package main

func main() {
        cmp(1)

        var (
                m map[int]int
                s struct{ x []int }
                f func()
        )
        noCmp(m)
        noCmp(s)
        noCmp(f)
}

func cmp(x interface{}) bool {
        return x == x
}

func noCmp(x interface{}) {
        shouldPanic(func() { cmp(x) })
}

func shouldPanic(f func()) {
        defer func() {
                if recover() == nil {
                        panic("function should panic")
                }
        }()
        f()
}