Here's another piece of documentation that seems pertinent. In perlref there's a section entitled Function Templates (almost at the bottom of the page).

The part probably of most interest starts with:

... incurs mysterious warnings about "will not stay shared" ...

and ends with

This has the interesting effect of creating a function local to another function, something not normally supported in Perl.

In reply to Re: Strictly nested sub warnings by kcott
in thread Strictly nested sub warnings by raybies

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