logilab/mtconverter/transform.py:59: error: Variable "builtins.NotImplemented" is not valid as a type [valid-type] logilab/mtconverter/transform.py:59: note: See https://mypy.readthedocs.io/en/latest/common_issues.html#variables-vs-type-aliases Found 2 errors in 2 files (checked 11 source files) ERROR: InvocationError for command /builds/open-source/logilab-mtconverter/.tox/mypy/bin/mypy logilab/mtconverter/ (exited with code 1) ___________________________________ summary ____________________________________ ERROR: mypy: commands failed Running after_script Uploading artifacts for failed job ERROR: Job failed: command terminated with exit code 1