I think we can also show how the aliased variable can be global with the following,

use vars '$i';
$i = 123;

sub foo {
  my $arg = shift;
  print "$arg, $i\n";
}

foreach $i (0..2) {
  foo($i);
}
foo('x'); # obviously alias works only within the loop

# Prints,
# 0,0
# 1,1
# 2,2
# x,123
[download]

If so, I have a question related to my scope. Within the previous example let's declared $i with my instead.

my $i;
$i = 123;

sub foo {
  my $arg = shift;
  print "$arg, $i\n";
}

foreach $i (0..2) {
  foo($i);
}
foo('x');

# Prints,
# 0,123
# 1,123
# 2,123
# x,123
[download]

At this point I'm confused in fact. Should not we get the same result? Does not my scope to nested blocks as well?

It looks like aliasing does not affect my'd variable despite to be within the same scope or nested scope. The previous result is what I have expected using my on the foreach itself.

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