# New Ticket Created by "Carl Mäsak" # Please include the string: [perl #72790] # in the subject line of all future correspondence about this issue. # <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=72790 >
<TimToady> rakudo: my $result = 0xdeadbeef.?deadbeef; say $result <p6eval> rakudo 1d4928: OUTPUT«Undefined value returned by invocation of undefined method» <TimToady> another case where rakudo returns a Failure that should probably just return Nil <jnthn> TimToady: Really? <TimToady> I told it the call was optional <jnthn> Hmm...true. <masak> rakudo: my $a; say ($a.?foo).WHAT <p6eval> rakudo 1d4928: OUTPUT«Failure()» * masak submits rakudobug <jnthn> The failure is easy to distinguish though. If I expected no results, it's harder to distinguish that from "nothing was called". <jnthn> That is, a method that just did return; would return Nil too, no? <TimToady> sure, though we could distinguish those in slice context, presumably <jnthn> Or if you were interesteed in the failure I guess use . and a try/CATCH <jnthn> Since presumably you want to do something on the failure anyway. <TimToady> I prefer exceptions to be reserved for unexpected things <jnthn> Yeah, good point. <TimToady> use of Failure as a normal return value is a design smell <jnthn> OK, we'll Nil it. :-) <jnthn> .oO( TimToady 1 - Nil jnthn ) <TimToady> basically, .* and by extension .? should return something sliceable to get the number of successful returns as subparcels <jnthn> Parcel of Parcels? <TimToady> presumably <jnthn> wfm <masak> oh, that's an even better explanation. <masak> it should be Nil because it's an empty list. <masak> parallel to quantifier ? returning an empty list upon no match. <TimToady> Parcel(Nil) is a real returned Nil, whille Nil is no parcels <TimToady> masak: nodnod
