original.name="Old_Valid_14"
js.compile.ignore=true
======
>>> main.whiley
variant immutable(&int p)
where *p == old(*p)

variant unchanged(&int p)
where immutable(p)

method m(&int p)
ensures unchanged(p):
    skip

public export method test():
    &int p = new 1
    m(p)
    assert *p == 1
    
---