Arg/Kwarg rename passes liskov substitution rule #8314

from typing import *


class Base(object):

    def fn(self, arg, kwarg=None):
        # type: (int, Optional[str]) -> None
        return


# Adding a kwarg passes - I think this correct
class Extension(Base):

    def fn(self, arg, kwarg=None, anotherKwarg=None):
        # type: (int, Optional[str], Optional[str]) -> None
        return


# Removing a kwarg errors - I think this correct
class RemovedKwargsExtension(Base):

    def fn(self, arg):
        # type: (int) -> None
        return


# Renaming args or kwargs passes - I expected this to error, at least for the kwarg rename.
class RenamedArgsExtension(Base):

    def fn(self, renamedArg, renamedKwarg=None):
        # type: (int, Optional[str]) -> None
        return