I know there are other ways to solve the actual problem

Just as simple as your code:

sub blah {
    my ($foo, $bar, $baz) = @_;
    for my $arg (qw( foo bar baz )) {
        croak("$arg missing/undefined") if !defined(shift);
    }

    ...
}
[download]

but I'm curious if there is a way to know the name of a variable

PadWalker

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