David Peter 4ef2c223c9 [ty] Respect MRO_NO_OBJECT_FALLBACK policy when looking up symbols on type instances (#18312) ... ## Summary This should address a problem that came up while working on https://github.com/astral-sh/ruff/pull/18280. When looking up an attribute (typically a dunder method) with the `MRO_NO_OBJECT_FALLBACK` policy, the attribute is first looked up on the meta type. If the meta type happens to be `type`, we go through the following branch in `find_name_in_mro_with_policy`: 97ff015c88/crates/ty_python_semantic/src/types.rs (L2565-L2573) The problem is that we now look up the attribute on `object` *directly* (instead of just having `object` in the MRO). In this case, `MRO_NO_OBJECT_FALLBACK` has no effect in `class_member_from_mro`: c3feb8ce27/crates/ty_python_semantic/src/types/class.rs (L1081-L1082) So instead, we need to explicitly respect the `MRO_NO_OBJECT_FALLBACK` policy here by returning `Symbol::Unbound`. ## Test Plan Added new Markdown tests that explain the ecosystem changes that we observe.		2025-05-26 12:03:29 +02:00
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annotated.md	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
any.md	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
callable.md	[ty] Respect MRO_NO_OBJECT_FALLBACK policy when looking up symbols on type instances (#18312)	2025-05-26 12:03:29 +02:00
deferred.md
int_float_complex.md
invalid.md	[ty] Improve invalid-type-form diagnostic where a module-literal type is used in a type expression and the module has a member which would be valid in a type expression (#18244)	2025-05-21 15:38:56 -04:00
literal.md
literal_string.md
never.md
new_types.md	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
optional.md
self.md	[ty] Induct into instances and subclasses when finding and applying generics (#18052)	2025-05-12 21:53:11 -04:00
starred.md	[ty] Understand homogeneous tuple annotations (#17998)	2025-05-12 22:02:25 -04:00
stdlib_typing_aliases.md	[ty] Do not carry the generic context of Protocol or Generic in the ClassBase enum (#17989)	2025-05-22 21:37:03 -04:00
string.md
union.md
unsupported_special_forms.md	[ty] Understand homogeneous tuple annotations (#17998)	2025-05-12 22:02:25 -04:00
unsupported_special_types.md	Generalize special-casing for enums constructed with the functional syntax (#17885)	2025-05-06 11:02:55 +01:00
unsupported_type_qualifiers.md