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Postings from August 2001
From: Dave Mitchell [mailto:davem@fdgroup.co.uk]
> Ken Fox <kfox@vulpes.com> wrote:
>
> > You're speaking in Perl implementation terms. I've already told you
> > that if Perl acts the way you say it does, then Perl has buggy
> > closures. You don't need to explain a bug to know that one exists!
>
> Okay, to humour me for a mo', what should the following 2 examples
> output if Perl were doing the "right" thing?
>
>
> sub pr { print $_[0] || 'undef', "\n" }
>
> { my $x = 'X'; sub f { $F = sub {pr $x} }}
> f(); $F->();
>
> { my $y = 'Y'; sub g { pr $y; $G = sub {pr $y} }}
> g(); $G->();
X
Y
Y
I'm hardly an authority, but a closure should reflect the environment at
runtime... not compile
You forgot the other example that someone raised:
{ my $x = 'X'; *h = sub { $H = sub {pr $h} }}
h(); $H->();
Which prints:
Z
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