Feb 2009 -- Due to time pressures, the ongoing development of 'rope' has been suspended temporarily.

ROPE Language Reference - "assert"

The "assert" action takes a value off the top of the stack and if it is a FALSE value (integer zero or empty string) then it terminates the script with a no status.

Example..

$ip_proto 6 eq assert
$ip_source 80 eq assert

See Also