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  1. or download this
    Foo.pm
------
...
init();

1;
  2. or download this
    main.pl
-------
...
use Foo ();

print("\$Foo::bar = $Foo::bar\n");
  3. or download this
    output
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Setting $Foo::bar to 42.
Use of uninitialized value in concatenation (.) or string at main.pl l
+ine 7.
$Foo::bar =