## Summary
This is required because otherwise the inferred type is not going to be
`Type::FunctionLiteral` but a todo type because we don't recognize
`TypeVar` yet:
```py
_FuncT = TypeVar("_FuncT", bound=Callable[..., Any])
def abstractmethod(funcobj: _FuncT) -> _FuncT: ...
```
This is mainly required to raise diagnostic when only some (and not all)
`@overload`-ed functions are decorated with `@abstractmethod`.
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