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## Summary Infer a type of `Self` for unannotated `self` parameters in methods of classes. part of https://github.com/astral-sh/ty/issues/159 closes https://github.com/astral-sh/ty/issues/1081 ## Conformance tests changes ```diff +enums_member_values.py:85:9: error[invalid-assignment] Object of type `int` is not assignable to attribute `_value_` of type `str` ``` A true positive ✔️ ```diff -generics_self_advanced.py:35:9: error[type-assertion-failure] Argument does not have asserted type `Self@method2` -generics_self_basic.py:14:9: error[type-assertion-failure] Argument does not have asserted type `Self@set_scale ``` Two false positives going away ✔️ ```diff +generics_syntax_infer_variance.py:82:9: error[invalid-assignment] Cannot assign to final attribute `x` on type `Self@__init__` ``` This looks like a true positive to me, even if it's not marked with `# E` ✔️ ```diff +protocols_explicit.py:56:9: error[invalid-assignment] Object of type `tuple[int, int, str]` is not assignable to attribute `rgb` of type `tuple[int, int, int]` ``` True positive ✔️ ``` +protocols_explicit.py:85:9: error[invalid-attribute-access] Cannot assign to ClassVar `cm1` from an instance of type `Self@__init__` ``` This looks like a true positive to me, even if it's not marked with `# E`. But this is consistent with our understanding of `ClassVar`, I think. ✔️ ```py +qualifiers_final_annotation.py:52:9: error[invalid-assignment] Cannot assign to final attribute `ID4` on type `Self@__init__` +qualifiers_final_annotation.py:65:9: error[invalid-assignment] Cannot assign to final attribute `ID7` on type `Self@method1` ``` New true positives ✔️ ```py +qualifiers_final_annotation.py:52:9: error[invalid-assignment] Cannot assign to final attribute `ID4` on type `Self@__init__` +qualifiers_final_annotation.py:57:13: error[invalid-assignment] Cannot assign to final attribute `ID6` on type `Self@__init__` +qualifiers_final_annotation.py:59:13: error[invalid-assignment] Cannot assign to final attribute `ID6` on type `Self@__init__` ``` This is a new false positive, but that's a pre-existing issue on main (if you annotate with `Self`): https://play.ty.dev/3ee1c56d-7e13-43bb-811a-7a81e236e6ab ❌ => reported as https://github.com/astral-sh/ty/issues/1409 ## Ecosystem * There are 5931 new `unresolved-attribute` and 3292 new `possibly-missing-attribute` attribute errors, way too many to look at all of them. I randomly sampled 15 of these errors and found: * 13 instances where there was simply no such attribute that we could plausibly see. Sometimes [I didn't find it anywhere](8644d886c6/openlibrary/plugins/openlibrary/tests/test_listapi.py (L33)). Sometimes it was set externally on the object. Sometimes there was some [`setattr` dynamicness going on](a49f6b927d/setuptools/wheel.py (L88-L94)). I would consider all of them to be true positives. * 1 instance where [attribute was set on `obj` in `__new__`](9e87b44fd4/sympy/tensor/array/array_comprehension.py (L45C1-L45C36)), which we don't support yet * 1 instance [where the attribute was defined via `__slots__` ](e250ec0fc8/lib/spack/spack/vendor/pyrsistent/_pdeque.py (L48C5-L48C14)) * I see 44 instances [of the false positive above](https://github.com/astral-sh/ty/issues/1409) with `Final` instance attributes being set in `__init__`. I don't think this should block this PR. ## Test Plan New Markdown tests. --------- Co-authored-by: Shaygan Hooshyari <sh.hooshyari@gmail.com>