Function fail

mypy/main.py:1716–1722

Fail with a serious error.

(msg: str, stderr: TextIO, options: Options)

def fail(msg: str, stderr: TextIO, options: Options) -> NoReturn:
    """Fail with a serious error."""
    stderr.write(f"{msg}\n")
    maybe_write_junit_xml(
        0.0, serious=True, all_messages=[msg], messages_by_file={None: [msg]}, options=options
    )
    sys.exit(2)


def read_types_packages_to_install(cache_dir: str, after_run: bool) -> list[str]: