Sorry, my mistake. They have to be nested anonymous subs, like this: 
my $foo = 'asdf' x 1000;

for (1..900000) {
    my $outer_sub = sub {
        my $inner_sub = sub { $foo };
    }
}

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In reply to Re: Re: Re: Garbage-collecting with closures by perrin
in thread Garbage-collecting with closures by batkins

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