I suspect it’s because putting things into @_ requires making an alias to them, and you can do them for something that actually exists. print obviously works differently, being a builtin.
$ perl -w
my @a = ();
print $a[-1];
foo("$a[-1]");
sub foo { }
^D
Use of uninitialized value in print at - line 2.
Use of uninitialized value in string at - line 3.
I have no idea what should be done about this and how.
Makeshifts last the longest.
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