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Postings from November 2016
On 9 November 2016 at 20:17, Hugo van der Sanden via RT
<perlbug-followup@perl.org> wrote:
> I was able to reduce it further to a standalone case:
>
> % cat lib/Unicode/EastAsianWidth.pm
> package Unicode::EastAsianWidth;
> use strict;
> use base 'Exporter';
>
> our @EXPORT = qw(InFullwidth);
>
> sub InFullwidth {
> return <<END;
> END
> }
>
> 1;
> __END__
> % perl -Ilib -e 'A::xx(); package A { use Unicode::EastAsianWidth; sub xx { split /[^\s\p{InFullwidth}]/, "x" } }'
> perl: util.c:1880: Perl_croak_no_modify: Assertion `0' failed.
> Aborted (core dumped)
> %
>
> Note that if the module is C<use>d before the package declaration, the assertion is not hit.
Oooh. ++ Even further:
./perl -Ilib -e 'A::xx(); package A; sub InFullwidth{ return "\n" }
sub xx { split /[^\s\p{InFullwidth}]/, "x" }'
SV = INVLIST(0x2391d00) at 0x2387178
REFCNT = 1
FLAGS = (READONLY,PROTECT)
PV = 0x2464530
CUR = 0
LEN = 9
perl: util.c:1880: Perl_croak_no_modify: Assertion `0' failed.
Aborted
If I replace the \s with its logical equivalent there is no assert:
./perl -Ilib -e 'A::xx(); package A { sub InFullwidth{ return "\n" }
sub xx { split /[^ \t\r\n\p{InFullwidth}]/, "x" } }'
and if I replace it with \w there is also no assert, but with \s, \h,
\d there is.
I have been poking around a bit more, and the place the invlist gets
its readonly flag turned on is the end of Perl__swash_to_invlist().
It looks to me like it gets compiled once, then for some reason we try
to compile it again, and it blows up.
Yves
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