So that this does not have to be manually passed to the `cargo clippy` command-line every single time. Also allows incrementally addressing these lints by removing and fixing them one-by-one.
corresponds to M-Labs RustPython fork at efdf7829ba1a5f87d30df8eaff12a330544f3cbd branch parser-mod
based on RustPython 67b338863ee6f16b0df0a7d1aa9debba55284651