original.name="ConstrainedInt_Valid_15"
======
>>> main.whiley


type pos is (int x) where x > 0

type neg is (int x) where x < 0

type posneg is pos | neg

function isPosNeg(int v) -> bool:
    if v is posneg:
        return true
    else:
        return false

public export method test() :
    assume isPosNeg(1)
    assume !isPosNeg(0)
    assume isPosNeg(-1)

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