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[ty] Include synthesized arguments in displayed counts for `too-many-positional-arguments` (#18098) 
## Summary

Resolves [#290](https://github.com/astral-sh/ty/issues/290).

All arguments, synthesized or not, are now accounted for in
`too-many-positional-arguments`'s error message.

For example, consider this example:

```python
class C:
	def foo(self): ...

C().foo(1)  # !!!
```

Previously, ty would say:

> Too many positional arguments to bound method foo: expected 0, got 1

After this change, it will say:

> Too many positional arguments to bound method foo: expected 1, got 2

This is what Python itself does too:

```text
Traceback (most recent call last):
  File "<python-input-0>", line 3, in <module>
    C().foo()
    ~~~~~~~^^
TypeError: C.foo() takes 0 positional arguments but 1 was given
```

## Test Plan

Markdown tests.
 		2025-05-14 22:51:23 -04:00
..
mdtest [ty] Include synthesized arguments in displayed counts for `too-many-positional-arguments` (#18098) 2025-05-14 22:51:23 -04:00
primer [ty] Understand classes that inherit from subscripted `Protocol[]` as generic (#17832) 2025-05-09 17:39:15 +01:00
README.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00

README.md

Markdown files within the mdtest/ subdirectory are tests of type inference and type checking; executed by the tests/mdtest.rs integration test.

See crates/ty_test/README.md for documentation of this test format.