original.name="Array_Valid_3"
======
>>> main.whiley
function f(int[] xs) -> (int r)
requires |xs| > 0
ensures r >= 0 && r < |xs|:
    //
    return 0

function g(int[] xs) -> (int r)
requires |xs| > 0:
    //
    int[] indices = [f(xs)]
    return xs[indices[0]]

public export method test():
    //
    assume g([0]) == 0
    //
    assume g([1,0]) == 1

---