__smatch_compare
__smatch_compare(a, c);
__smatch_compare(a, d);
__smatch_compare(a, d);
__smatch_compare(a, b + c);
__smatch_compare(a, b + c);
__smatch_compare(a, b + c);
__smatch_compare(x, y);
__smatch_compare(x, y);
__smatch_compare(x, y);
__smatch_compare(a, xxx);
__smatch_compare(a, b);
__smatch_compare(b, c);
__smatch_compare(g, e);
__smatch_compare(e, g);
__smatch_compare(x, y);
__smatch_compare(g, e);
__smatch_compare(a, b);
__smatch_compare(a, b);
__smatch_compare(a, b);