I think this should clear things up a bit (from perlsub):
A "local" just gives
temporary values to global (meaning package) variables. It does not create a local variable.
I read that as meaning it works like this:
print "$x, ", pos($x), "\n";
{
$tmp_1 = $x;
$x = undef;
$x = $tmp_1; # assign "old" value to $x, losing the pos() informat
+ion.
}
print "$x, ", pos($x), "\n";
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