original.name="Function_Valid_8"
======
>>> main.whiley
type nat is (int x) where x >= 0

function g(nat[] xs) -> nat[]:
    nat[] ys = [0; |xs|]
    int i = 0
    while i < |xs| where i >= 0 && |xs| == |ys|:
        if xs[i] > 1:
            ys[i] = xs[i]
        i = i + 1
    return ys

function f(int[] x) -> int[]:
    return x

public export method test() :
    nat[] ys = [1, 2, 3]
    assume f(g(ys)) == [0, 2, 3]


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