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  1. or download this
    use 5.010;
    use Scope::Upper qw(localize UP);
    ...
    say "before bar: ", $foo;
    bar();
    say "after bar: ", $foo;
    
  2. or download this
    use 5.010;
    our $foo = 42;
    ...
    say "before bar: ", $foo;
    bar();
    say "after bar: ", $foo;