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// $G $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

func assert(cond bool, msg string) {
        if !cond {
                print("assertion fail: ", msg, "\n")
                panic(1)
        }
}

const (
        x int = iota
        y = iota
        z = 1 << iota
        f float32 = 2 * iota
        g float32 = 4.5 * float32(iota)
)

const (
        X = 0
        Y
        Z
)

const (
        A = 1 << iota
        B
        C
        D
        E = iota * iota
        F
        G
)

const (
        a = 1
        b = iota << a
        c = iota << b
        d
)

const (
        i = (a << iota) + (b * iota)
        j
        k
        l
)

const (
        m = iota == 0
        n
)

const (
        p = float32(iota)
        q
        r
)

const (
        s = string(iota + 'a')
        t
)

const (
        abit, amask = 1 << iota, 1<<iota - 1
        bbit, bmask = 1 << iota, 1<<iota - 1
        cbit, cmask = 1 << iota, 1<<iota - 1
)

func main() {
        assert(x == 0, "x")
        assert(y == 1, "y")
        assert(z == 4, "z")
        assert(f == 6.0, "f")
        assert(g == 18.0, "g")

        assert(X == 0, "X")
        assert(Y == 0, "Y")
        assert(Z == 0, "Z")

        assert(A == 1, "A")
        assert(B == 2, "B")
        assert(C == 4, "C")
        assert(D == 8, "D")
        assert(E == 16, "E")
        assert(F == 25, "F")

        assert(a == 1, "a")
        assert(b == 2, "b")
        assert(c == 8, "c")
        assert(d == 12, "d")

        assert(i == 1, "i")
        assert(j == 4, "j")
        assert(k == 8, "k")
        assert(l == 14, "l")

        assert(m, "m")
        assert(!n, "n")

        assert(p == 0.0, "p")
        assert(q == 1.0, "q")
        assert(r == 2.0, "r")

        assert(s == "a", "s")
        assert(t == "b", "t")

        assert(abit == 1, "abit")
        assert(amask == 0, "amask")
        assert(bbit == 2, "bbit")
        assert(bmask == 1, "bmask")
        assert(cbit == 4, "cbit")
        assert(cmask == 3, "cmask")
}