"perldoc perldebug" says:
Debugging compile-time statements
If you have compile-time executable statements (such as code within
BEGIN and CHECK blocks or use statements), these will not be
stopped by debugger, although requires and INIT blocks will, and
compile-time statements can be traced with AutoTrace option set
in PERLDB_OPTS). From your own Perl code, however, you can
transfer control back to the debugger using the following statement,
which is harmless if the debugger is not running:
$DB::single = 1;
So it seems you were close but you need to put that BEGIN
block in your source code and not in PERL5DB environment
variable. (Though I haven't tried this.)
(but my friends call me "Tye")
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