original.name="Subtype_Valid_3"
======
>>> main.whiley
type sr8nat is (int n) where n > 0

type sr8tup is ({sr8nat f, int g} r) where r.g > r.f

public export method test() :
    sr8tup[] x = [{f: 1, g: 3}, {f: 4, g: 8}]
    x[0].f = 2
    assume x == [{f: 2, g: 3}, {f: 4, g: 8}]

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