Segfault in resulting program reversing operands of subscript operator

[ajaxvp]

xs[4] works, but not the reverse:

int main(void)
{
    int xs[5] = { 0, 1, 2, 3, 4 };

    ASSERT_EQUALS(xs[0], 0);
    ASSERT_EQUALS(xs[1], 1);
    ASSERT_EQUALS(xs[2], 2);
    ASSERT_EQUALS(xs[3], 3);
    ASSERT_EQUALS(xs[4], 4);

    // segfaults
    ASSERT_EQUALS(4[xs], 4);
}