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use List::Util qw/reduce/;
# my ($a,$b)=(0,0);
print reduce { $b+=$a } 1..10;

use warnings;
use strict;
...

use Data::Dump;
dd \@x; 

my ($a,$b)=(0,0);
print sort { $b cmp $a } 1..10;

Can't use "my $b" in sort comparison at ... line 2.

use warnings;
use strict;
...
package Tst;

print sort { $b cmp $a } 1..10;

Use of uninitialized value $b in string comparison (cmp) at /home/lanx
+/B/PL/PM/ScopeListUtils.pl line 9.
Use of uninitialized value $a in string comparison (cmp) at /home/lanx
+/B/PL/PM/ScopeListUtils.pl line 9.
Use of uninitialized value $b in string comparison (cmp) at /home/lanx
+/B/PL/PM/ScopeListUtils.pl line 9.
Use of uninitialized value $a in string comparison (cmp) at /home/lanx
+/B/PL/PM/ScopeListUtils.pl line 9.
...