rx_popindex signature is incorrect in the pre-patch example.
--- rx.ops.old 2003-06-06 18:27:00.000000000 +0200 +++ rx.ops 2003-10-20 23:08:24.000000000 +0200 @@ -108,7 +108,7 @@ rx_literal S0, I1, "b", $next branch $top $backtrack: - rx_popindex S0, I1, $advance + rx_popindex I1, $advance $next: rx_oneof S0, I1, "cd", $backtrack branch $success -- stef