http://www.perlmonks.org?node_id=338822


in reply to Re: Why no bareword warnings while inside of BEGIN
in thread Why no bareword warnings while inside of BEGIN

Also, IIRC, the strict and warning pragma's are imported *after* the BEGIN block.

There's one way to find out :)

$ perl   
use strict;
BEGIN { $x = 'y'; $$x = 1; print $y }
Global symbol "$x" requires explicit package name at - line 2.
Global symbol "$x" requires explicit package name at - line 2.
Global symbol "$y" requires explicit package name at - line 2.
BEGIN not safe after errors--compilation aborted at - line 2.

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As it turns out, use calls reduce to BEGIN blocks and BEGIN blocks fire in order of encountering.

In Section Seekers of Perl Wisdom