This will happen when you call a sub with an ampersand but without any parentheses, like the following:

⊂

Doing so makes the calling sub's @_ visible to called subroutine. To avoid this, either omit the ampersand or include empty parens when calling a sub with no args. See perlsub for more info.

In reply to Re: phantom subroutine parameter values by blahblahblah
in thread phantom subroutine parameter values by rpelak

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