In my opinion, $_ springs into being when Perl feels it's appropriate -- it's an auto-vivified rvalue.
On the other hand, $_ is *never* an lvalue unless you're using a regexp to modify the value, as in $_ =~ s/foo/bar/;, and even that's stretching a point, because of course uou can do the same thing with just s/foo/bar/;
So I would say that any code that *sets* $_ is, by definition, wrong.
Alex / talexb / Toronto
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