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  1. or download this
    use warnings;
use diagnostics;
  2. or download this
    use strict;
use warnings;
...
    
Uncaught exception from user code:
    Can't use an undefined value as a HASH reference at line 8.
  3. or download this
    use strict;
use warnings;
...

--Error--
This caused no error
  4. or download this
    use strict;
use warnings;
...

--Error--
This caused no error also