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An alternation of literal strings doesn't backtrack properly in Rakudo #3055

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p6rt opened this issue Feb 21, 2013 · 3 comments
Open

An alternation of literal strings doesn't backtrack properly in Rakudo #3055

p6rt opened this issue Feb 21, 2013 · 3 comments
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@p6rt
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p6rt commented Feb 21, 2013

Migrated from rt.perl.org#116893 (status was 'open')

Searchable as RT116893$

@p6rt
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p6rt commented Feb 21, 2013

From @masak

<TimToady> nr​: say "abcde" ~~ / | @​(<a b bc cde>)+»/
<p6eval> niecza v24-23-g0520c7c​: OUTPUT«「abcde」␤␤»
<p6eval> ..rakudo 9c59a1​: OUTPUT«「cde」␤␤»
<TimToady> wow
<masak> what's that » doing there?
<masak> word boundary, right?
<TimToady> nod
<TimToady> forcing backtracking
<TimToady> which n does but r doesn't for the literals
<masak> so... Niecza is right on the first one?
<TimToady> yes, because nothing committed to the current LTM inside the @​
* masak submits rakudobug

@p6rt
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p6rt commented May 12, 2016

From @coke

On Thu Feb 21 08​:57​:24 2013, masak wrote​:

<TimToady> nr​: say "abcde" ~~ / | @​(<a b bc cde>)+»/
<p6eval> niecza v24-23-g0520c7c​: OUTPUT«「abcde」␤␤»
<p6eval> ..rakudo 9c59a1​: OUTPUT«「cde」␤␤»
<TimToady> wow
<masak> what's that » doing there?
<masak> word boundary, right?
<TimToady> nod
<TimToady> forcing backtracking
<TimToady> which n does but r doesn't for the literals
<masak> so... Niecza is right on the first one?
<TimToady> yes, because nothing committed to the current LTM inside the @​
* masak submits rakudobug

2016, behavior unchanged​:

10​:11 < [Coke]> m​: say "abcde" ~~ / | @​(<a b bc cde>)+»/
10​:11 <+camelia> rakudo-moar 1e5df4​: OUTPUT«「cde」␤»

--
Will "Coke" Coleda

@p6rt
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p6rt commented May 12, 2016

The RT System itself - Status changed from 'new' to 'open'

@p6rt p6rt added the Bug label Jan 5, 2020
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