LTM alternation captures the wrong stuff when backtracking in Rakudo

[p6rt]

Migrated from rt.perl.org#116895 (status was 'resolved')

Searchable as RT116895$

[p6rt]

From @masak

<TimToady> nr​: say "abcde" ~~ / (a | b | bc | cde)+»/
<p6eval> rakudo 9c59a1​: OUTPUT«｢abcde｣␤ 0 => ｢a｣␤ 0 => ｢bc｣␤ 0 => ｢b｣␤
0 => ｢cde｣␤␤»
<p6eval> ..niecza v24-23-g0520c7c​: OUTPUT«｢abcde｣␤ 0 => ｢a｣␤ 0 => ｢b｣␤
0 => ｢cde｣␤␤»
<TimToady> ooh, another bug
<TimToady> backtrack isn't taking out the [bc] in rakudo
<TimToady> (which can't happen in a pure Cursor model because the info
should be attached only to the cursor that is thrown away in order to
backtrack)
* masak submits rakudobug
<FROGGS> masak​: can you assign it to me?
<masak> FROGGS​: I'll try.

[p6rt]

From @usev6

Looks like this was fixed for Moar (because of jnthn++'s work for RT #​125285).

$ perl6-m -e 'say "abcde" ~~ / (a | b | bc | cde)+»/'
｢abcde｣
0 => ｢a｣
0 => ｢b｣
0 => ｢cde｣

I added a test (fudged 'todo' for JVM) to S05-match/capturing-contexts.t with commit Raku/roast@82d271359f.

[p6rt]

From @usev6

Looks like this was fixed for Moar (because of jnthn++'s work for RT #​125285).

$ perl6-m -e 'say "abcde" ~~ / (a | b | bc | cde)+»/'
｢abcde｣
0 => ｢a｣
0 => ｢b｣
0 => ｢cde｣

I added a test (fudged 'todo' for JVM) to S05-match/capturing-contexts.t with commit Raku/roast@82d271359f.

[p6rt]

@usev6 - Status changed from 'new' to 'open'

[p6rt]

From @usev6

This works now on the JVM backend as well (test in S05-match/capturing-contexts.t is passing). Fixed with nqp commit Raku/nqp@f22b0b2d0e

I'm closing this ticket as 'resolved'.

[p6rt]

From @usev6

This works now on the JVM backend as well (test in S05-match/capturing-contexts.t is passing). Fixed with nqp commit Raku/nqp@f22b0b2d0e

I'm closing this ticket as 'resolved'.

[p6rt]

@usev6 - Status changed from 'open' to 'resolved'