'Test a problem caused by invalid discovery of loop argument
when a variable is used afterwards but not before.
Before the fix, this will result in::
numba.ir.NotDefinedError: \'i\' is not defined'

def test_invalid_argument(self):

    from numba import jit
    @jit(forceobj=True)
    def test(arg):
        if (type(arg) == np.ndarray):
            if (arg.ndim == 1):
                result = 0.0
                j = 0
                for i in range(arg.shape[0]):
                    pass
            else:
                raise Exception
        else:
            result = 0.0
            (i, j) = (0, 0)
            return result
    arg = np.arange(10)
    self.assertEqual(test.py_func(arg), test(arg))
