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Postings from July 2013
On Tue Jul 30 12:33:33 2013, sprout wrote:
> use PadWalker 'peek_my';
> use Data::Dumper;
> use Scalar::Util 'weaken';
>
> my @vars;
> sub outer {
> my ($var1, $var2, $var3);
> push @vars, \$var1, \$var2, \$var3;
> weaken $_ for @vars;
> return sub { $var2; @vars; warn Dumper peek_my(0); }
> }
>
> outer->()
> __END__
> $VAR1 = {
> '$var2' => \undef,
> '@vars' => [
> undef,
> $VAR1->{'$var2'},
> undef
> ]
> };
>
> You see that two of the weak references in @vars have gone stale by the
> time the closure is called.
I don’t think it is worth changing how closures work for the sake of
those cases where the outer sub is still running.
In short: closures close over variables, not lexical scopes, unless
string eval is involved. (So one can work around this by including eval
"" in the sub.)
I don’t think anything needs fixing here, so I am rejecting the ticket.
--
Father Chrysostomos
---
via perlbug: queue: perl5 status: open
https://rt.perl.org:443/rt3/Ticket/Display.html?id=119049
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