data_lang/j8_lite.py:6: error: Cannot find implementation or library stub for module named 'fastfunc'
mycpp/mylib.py:21: error: Cannot find implementation or library stub for module named 'posix_'
mycpp/mylib.py:21: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
Found 2 errors in 2 files (checked 12 source files)