Pylint duplicate declaration

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• pylint can find such problems, along with a bunch of others.

pylint -E duplicate_add.py

************* Module duplicate_add
examples/functions/duplicate_add.py:4:0: E0102: function already defined line 1 (function-redefined)
examples/functions/duplicate_add.py:9:0: E1121: Too many positional arguments for function call (too-many-function-args)