I found a serious limitation in PadWalker and I'm not optimistic this can be resolved easily.

var_name() seems to fail if the originating context of the lexical variable was a string eval

use strict;
use warnings;

use Data::Dump qw(pp dd);
use PadWalker qw/var_name/;

sub _ { return var_name(1, \$_[0] ) => $_[0] }

sub t_ { _ my $xxx=666 }

dd [ t_ ];                     # works: ["\$xxx", 666]

dd [ _ my $xxx=666 ];          # works: ["\$xxx", 666]

dd [ eval '_ my $xxx=666' ];   # fails: [undef, 666]
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The module is called PadWalker and seems eval doesn't use a "pad" for lexicals (?)

This limitation isn't listed in the docs (no mention of eval at all).

Or am I missing something?