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use warnings;
use strict;
...
@| = (1..3);

# @a =(1..3);  #  'requires explicit package name'  if uncommented

Perl identifiers that begin with digits, control characters, or punctu
+ation characters are exempt from the effects of the package declarati
+on and are always forced to be in package main ; they are also exempt
+ from strict 'vars' errors. A few other names are also exempt in thes
+e ways:

        ENV      STDIN
...
        ARGV     STDERR
        ARGVOUT
        SIG