A while back I'd talked to Randal about closures, and he told me that a closure needn't be a code reference: 
>>>>> "Jeff" == Jeff Pinyan <jeffp@crusoe.net> writes:

Jeff> A closure is an ANONYMOUS function (constructed via $x = sub {
Jeff> ... }) that contains LEXICAL variables that have been defined in
Jeff> a scope visible to the closure itself.

leave out the word ANONYMOUS there.

ANONYMOUS and CLOSURE are orthogonal.

in "BEGIN { my $x; sub foo { ... $x ... } }", foo is a CLOSURE
and is not ANONYMOUS.

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japhy -- Perl and Regex Hacker

In reply to A Real Closure by japhy
in thread Unusual Closure Behaviour by tachyon

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