Oh this is funny. The original question I wanted to post was only about this code:

if ($line = /something/) {
}
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that I checked with B::Deparse and which did not show the implicit use of $_. The other examples (the implicit use of @_ and @ARGV) I added only to the post and did not test it. I should have done it before posting.

So yes, those work for me as well but the one I originally wanted does not work.

My intention was to ask about the various places where implicit variables are used. As I can see B::Deparse shows @_ and @ARGV but does not show the use of $_.

So let's see if there is a tool that can show the $_ where it is used implicitly?