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  1. or download this
    use feature qw( say refaliasing );
no warnings qw( experimental::refaliasing );
...
range();                 #  7  -

say join ', ', @stack;   # ""
  2. or download this
    my $i = 4;               # $i  @stack
                         # --  -------
...
range();                 #  7  4,5,6

say join ', ', @stack;   # "4, 5, 6"