To be honest, at the time of my writing my "definition" of closures was "functions holding refs to outer variables". I went to re-read the wikipedia article shortly after posting.
That said, I have yet to come across a case where several functions share the same context (aside from global variables, e.g. my $foo in the beginning of a package). If I was to design something like that (especially if the context was supposed to be mutable), I would probably end up with a class. Perl is object-oriented, after all.
An example I could imagine was several AnyEvent callback sharing the same resource guard - where resource is not released until all callbacks have either fired, or failed. But this is, again, closer to "generation of subs" then to "use of full power of closures".
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