original.name="Reference_Valid_15"
======
>>> main.whiley
public export method test():
    &(null|int) c = new (null|int) 1
    &(null|int) d = c
    *c = 123
    assert (*c) == 123
    assert (*d) == 123
    *c = null
    assert (*c) == null
    assert (*d) == null


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