'Test issue #493'

@tag('important')
def test_int_tuple_unify(self):

    def foo(an_int32, an_int64):
        a = (an_int32, an_int32)
        while True:
            a = (an_int32, an_int64)
        return a
    args = (i32, i64)
    cres = compile_isolated(foo, args)
