I'm confused ... isn't this the old
"won't stay shared" discussion?
Named subs are defined at compile time, that's why you can call a sub which is defined later.
A closure can only "share" the set of closed over variables it sees at definition time.
(i.e. name and reference are added to the "lexical pad" compare PadWalker)
That's why nesting named subs are discouraged in Perl.
edit
But when using an anonymous sub, the definition happens at run time.
something like
*name = sub {...} would solve this.
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