I have to admit ignorance of what really happens inside Perl but a small experiment sheds a bit of light on the situation:
use strict;
use warnings;
my $S4 = "aaa";
sub X {
print "<$S4>\n";
return $S4;
}
for $S4 (1 .. 2) {
print "A: <$S4> <", X(), ">\n";
}
which supports the "closure theory", imho.
Update: adding to my experiment as follows
use strict;
use warnings;
my $S4 = "aaa";
sub X {
print "<$S4>\n";
return $S4;
}
for $S4 (1 .. 2) {
print "A: <$S4> <", X(), ">\n";
}
$S4 = "bbb";
print "B: <", X(), ">\n";
which seems to confirm the theory that the loop variable is implicitly localized.
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