original.name="Reference_Valid_16"
======
>>> main.whiley
type Point is {int x, int y}

public export method test():
    &(null|Point) c = new (null|Point) {x:1,y:1}
    &(null|Point) d = c
    *c = {x:2,y:2}
    assert (*c) == {x:2,y:2}
    assert (*d) == {x:2,y:2}
    *c = null
    assert (*c) == null
    assert (*d) == null


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