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  1. or download this
    use Smart::Comments;    # Enable special comments for debugging

...
for (0..$max) {         ### for2 |===[%]    |
    sleep(1);
};
  2. or download this
    1:    say "var: $var";     # DEBUG
2:    say '$var', $var;    # DEBUG
2:    say $var;            # DEBUG
3:    say $var;
  3. or download this
    my $tmp    = scalar @foobar;
### Elements count: $tmp
  4. or download this
    use Smart::Comments '###', '####';
###   $foo          # $foo will be dumped
####  $foo          # $foo will be dumped
##### $foo          # nothing happens
  5. or download this
    use Smart::Comments;
###   $foo          # $foo will be dumped
no Smart::Comments;
###   $foo          # nothing happens