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Lexical character classes cannot be used for complement or combined #4619

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p6rt opened this issue Oct 2, 2015 · 4 comments
Open

Lexical character classes cannot be used for complement or combined #4619

p6rt opened this issue Oct 2, 2015 · 4 comments
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@p6rt
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@p6rt p6rt commented Oct 2, 2015

Migrated from rt.perl.org#126252 (status was 'open')

Searchable as RT126252$

@p6rt
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@p6rt p6rt commented Oct 2, 2015

From @ronaldxs

The last two cases below fail and they should not. The problem was discussed on IRC here​: http://irclog.perlgeek.de/perl6/2015-10-02#i_11309820 .

The error in both cases on my system reads​:
Method 'hexlet' not found for invocant of class 'Cursor'
  in block <unit> at unreserved.pl6​:11

my token hexlet { <[A..F]> }

grammar G {
  token TOP { <- hexlet> }
  token hexlet { <[A..F]> }
}

say so G.parse('.');
say so G.parse('A');
say so '.' ~~ /<- alpha>/;
try { say so '.' ~~ /<- hexlet>/ }
say $!;
try { say so '.' ~~ /<[Q..Z] + hexlet>/ }
say $!;

@p6rt
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@p6rt p6rt commented Aug 25, 2016

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

@p6rt
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@p6rt p6rt commented Sep 21, 2016

From @smls

This bug is still present in
  Rakudo version 2016.09-21-g3ed51de built on MoarVM version 2016.09 implementing Perl 6.c.

Shorter test-case​:

  my token hexlet { <[A..F]> };
  say "A" ~~ /<hexlet>/; # 「A」␤ hexlet => 「A」
  say "A" ~~ /<- hexlet>/; # Method 'hexlet' not found for invocant of class 'Cursor'

@p6rt
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@p6rt p6rt commented Jan 7, 2017

From @ronaldxs

Possibly more complete test case​:

my token hexlet { <[A..F]> };
say "A" ~~ /<hexlet>/; # 「A」␤ hexlet => 「A」
try { # Method 'hexlet' not found for invocant of class 'Cursor'
  say "A" ~~ /<+ hexlet>/
} // say "error​: $!";
try { # also Method 'hexlet' not found for invocant of class 'Cursor'
  say "A" ~~ /<- hexlet>/
} // say "error​: $!";

@p6rt p6rt added the regex label Jan 5, 2020
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