Too many positional arguments to bound method: expected 0, got 0

Minimal reproducible example ([playground](https://play.ty.dev/afd4f49f-a6a8-4b31-86e2-de0072c1f88e)):

```python
class A:
    def foo(): ...  # No `self`

A().foo()  # Too many positional arguments to bound method `foo`: expected 0, got 0
```

Arguably, the "got 0" part should be "got 1 (including `self`)".