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$ python -c 'print("START"); print(x + y)'
START
...
Global symbol "$x" requires explicit package name (did you forget to d
+eclare "my $x"?) at -e line 1.
Global symbol "$y" requires explicit package name (did you forget to d
+eclare "my $y"?) at -e line 1.
Execution of -e aborted due to compilation errors.