Here's the difference:
use strict;
use warnings;
use 5.010;
our $foo = 'hello';
sub f {
print("$foo\n");
}
for my $foo (qw( a b c )) {
f();
}
--output:--
hello
hello
hello
In ikegami's example, the my is omitted in the for loop, which causes the for loop to change the global variable $foo--and the subroutine prints the global $foo (i.e. the subroutine is a closure).
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