| Subject: | Modification of a read-only value |
This is a totally weird bug, here's how to reproduce it:
1) Use a simple grammar, like
A.yp:
-----
%%
expr: NUM;
%%
2) yapp it:
yapp -m A A.yp
3) use it in a way so that $_ is the loop variable (never mind the
lexer, it's irrelevant):
use A;
my $p = A->new();
for ("5") {
$p->YYParse(
yylex => sub { ("NUM", "5") },
yyerror => sub { die "Error" },
yydebug => 1,
);
}
4) you'll get:
Modification of a read-only value attempted at
/home/mschilli/PERL/lib/perl5/site_perl/5.8.7/Parse/Yapp/Driver.pm line 209.
5) However, if you localize
local($_);
then it works fine.
It only occurs when debugging is enabled. Can you make any sense out of
this?
Thanks for a great module, btw., Parse::Yapp rocks!