@typing.overload-ed methods not supported

[EFord36]

Following on from #196 - sorry, I probably should have highlighted methods as important to me.

When docsig checks the following code:

class SomeClass:

    @overload
    def process(self, response: None) -> None:
        ...
    @overload
    def process(self, response: int) -> tuple[int, str]:
        ...
    @overload
    def process(self, response: bytes) -> str:
        ...
    def process(self, response):
        """process a response.

        :param response: the response to process
        :return: something depending on what the response is
        """
        ...  # actual implementation goes here

I get the following error:

no_vc/test_docsig_methods.py:12 in SomeClass
--------------------------------------------
def process(✖None) -> ✓str:
    """
    :param response: ✖
    :return: ✓
    """

E102: includes parameters that do not exist

I had a go debugging and think I've tracked down the issue:

inserting:

                        if func.name == "process":
                            breakpoint()

just before this line

and then running subnode.args.arguments shows that the self argument isn't prevent, as it appears to be for a non-overload-ed method:

debugging session:

> docsig/_module.py(61)__init__()
-> func = _Function(
(Pdb) subnode.args.arguments
[<AssignName.response l.12 at 0x1058eeb80>]
(Pdb) 

Then, when creating the _Signature, docsig pops the first argument if the relevant function is a (non-static) method, which in this case is the 'actual' first argument response.

[EFord36]

Just dug into a bit more why it is the case that the 'self' is missing - should have been obvious to me the first time, sorry!

It's because we end up creating a function twice and therefore the pop gets done twice.