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  1. or download this
    $ perl -Mstrict -Mwarnings -le '
        package myDebugger;
    ...
    '
    0
    0
    
  2. or download this
    $ perl -Mstrict -Mwarnings -le '
        package myDebugger;
    ...
    '
    Global symbol "$debugger" requires explicit package name at -e line 11
    +.
    Execution of -e aborted due to compilation errors.
    
  3. or download this
    $ perl -Mstrict -Mwarnings -le '
        package myDebugger;
    ...
    '
    singleton
    singleton