original.name="ConstrainedInt_Valid_13"
======
>>> main.whiley
type codeOp is (int x) where 1 <= x && x <= 4

type code is {codeOp op, int[] payload}

function f(code x) -> int: 
    int y = x.op
    return y

public export method test() :
    assume f({op: 1, payload: [1]}) == 1

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