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$ perl -Mstrict -Mwarnings -le '
    package myDebugger;
...
'
0
0

$ 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.

$ perl -Mstrict -Mwarnings -le '
    package myDebugger;
...
'
singleton
singleton