# New Ticket Created by "Carl Mäsak" # Please include the string: [perl #75600] # in the subject line of all future correspondence about this issue. # <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=75600 >
<masak> what's the semantics of $2 in a regex with fewer than three parentheses? <masak> rakudo: say "foo" ~~ /f(.)$2 o/ <p6eval> rakudo b258f5: OUTPUT«foo» <masak> alpha: say "foo" ~~ /f(.)$2 o/ <p6eval> alpha 30e0ed: OUTPUT«Null PMC access in get_string() [...] <masak> I have to confess I like alpha's reaction better in this case. * masak submits rakudobug <jnthn> Great, we spend all our time removing null PMC accesses... <jnthn> :P <masak> :) <jnthn> masak: I guess what you're saying is you want an error? <masak> aye. <jnthn> Or at least a warning. <jnthn> It's one of those things we should be able to spot and barf over at compile time though, I guess. <masak> since this is something that we can statically check for... <masak> right. <masak> rakudo: say "foo" ~~ / f $0 (.) / <p6eval> rakudo b258f5: OUTPUT«fo» <jnthn> masak: heh <masak> jnthn: that's why it must be wrong. Note that alpha's error is actually a runtime error. Still, it fortuitously prevents the outright erroneous match shown in the last evaluation.
