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Global symbol "$dir" requires explicit package name at test.pl line 4.
Global symbol "$dir" requires explicit package name at test.pl line 5.
...
Global symbol "$file" requires explicit package name at test.pl line 6
+.
Global symbol "$file" requires explicit package name at test.pl line 7
+.
Execution of test.pl aborted due to compilation errors.

use strict;
use warnings;
...
  }
}
closedir(DIR);