Personally, I'm really bad at closures, but it seems clear the code block compiled in your regex is only compiled once and it's pushing onto the
@o declared in the first call to
foo(). It would seem closures pull a copy of their local scope with them when they stick around.
The obvious choices for articles here are "Why Closures?" (merlyn links to an article of his) and "Trying to understand closures."
I first ran into problems with closures in
the mod_perl docs. Although, I just went through all my posts though, because I swear I asked a question similar to yours here like three years ago...
UPDATE: It isn't exactly clear to my why this code is cached (or whatever) though. Why does that code block (as rhesa puts it) "get closed over?"
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