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Exact
Alex Waygood d02c9ada5d
[ty] Do not carry the generic context of Protocol or Generic in the ClassBase enum (#17989) 
## Summary

It doesn't seem to be necessary for our generics implementation to carry
the `GenericContext` in the `ClassBase` variants. Removing it simplifies
the code, fixes many TODOs about `Generic` or `Protocol` appearing
multiple times in MROs when each should only appear at most once, and
allows us to more accurately detect runtime errors that occur due to
`Generic` or `Protocol` appearing multiple times in a class's bases.

In order to remove the `GenericContext` from the `ClassBase` variant, it
turns out to be necessary to emulate
`typing._GenericAlias.__mro_entries__`, or we end up with a large number
of false-positive `inconsistent-mro` errors. This PR therefore also does
that.

Lastly, this PR fixes the inferred MROs of PEP-695 generic classes,
which implicitly inherit from `Generic` even if they have no explicit
bases.

## Test Plan

mdtests
2025-05-22 21:37:03 -04:00
..
annotations.md_-_Assignment_with_anno…_-_PEP-604_in_non-type-…_-_Earlier_versions_(f2859c9800f37c7).snap [ty] Tell the user why we inferred the Python version we inferred (#18082) 2025-05-21 11:06:27 -04:00
assert_never.md_-_`assert_never`_-_Basic_functionality_(78e7b52096b8d36c).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
assert_type.md_-_`assert_type`_-_Basic_(c507788da2659ec9).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_`ClassVar`s_(8d7cca27987b099d).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_Data_descriptors_-_Invalid_`__set__`_me…_(116c27bd98838df7).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_Data_descriptors_-_Invalid_argument_typ…_(a903c11fedbc5020).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_Instance_attributes_…_(ebfb3de6d1b96b23).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_Possibly-unbound_att…_(e5bdf78c427cb7fc).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_Pure_instance_attrib…_(d13d57d3cc36face).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_Setting_attributes_o…_(467e26496f4c0c13).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
attribute_assignment…_-_Attribute_assignment_-_Unknown_attributes_(368ba83a71ef2120).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
basic.md_-_Structures_-_Multiple_objects_imp…_(cbfbf5ff94e6e104).snap [ty] Add note to unresolved-import hinting to users to configure their Python environment (#18207) 2025-05-19 17:24:25 -04:00
basic.md_-_Structures_-_Unresolvable_module_…_(846453deaca1071c).snap [ty] Add note to unresolved-import hinting to users to configure their Python environment (#18207) 2025-05-19 17:24:25 -04:00
basic.md_-_Structures_-_Unresolvable_submodu…_(4fad4be9778578b7).snap [ty] Add note to unresolved-import hinting to users to configure their Python environment (#18207) 2025-05-19 17:24:25 -04:00
for.md_-_For_loops_-_`__iter__`_does_not_…_(92e3fdd69edad63d).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_`__iter__`_method_wi…_(1136c0e783d61ba4).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_`__iter__`_returns_a…_(707bd02a22c4acc8).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Bad_`__getitem__`_me…_(3ffe352bb3a76715).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Invalid_iterable_(3153247bb9a9b72a).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_New_over_old_style_i…_(a90ba167a7c191eb).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_No_`__iter__`_method…_(36425dbcbd793d2b).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Possibly-not-callabl…_(49a21e4b7fe6e97b).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Possibly_invalid_`__…_(6805a6032e504b63).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Possibly_invalid_`__…_(6388761c90a0555c).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Possibly_invalid_`__…_(c626bde8651b643a).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Possibly_unbound_`__…_(3b75cc467e6e012).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Possibly_unbound_`__…_(8745233539d31200).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Possibly_unbound_`__…_(b1ce0da35c06026).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Union_type_as_iterab…_(6177bb6d13a22241).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_Union_type_as_iterab…_(ba36fbef63a14969).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
for.md_-_For_loops_-_With_non-callable_it…_(a1cdf01ad69ac37c).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
functions.md_-_Generic_functions___L…_-_Inferring_a_bound_ty…_(d50204b9d91b7bd1).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
functions.md_-_Generic_functions___L…_-_Inferring_a_constrai…_(48ab83f977c109b4).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
functions.md_-_Generic_functions___P…_-_Inferring_a_bound_ty…_(5935d14c26afe407).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
functions.md_-_Generic_functions___P…_-_Inferring_a_constrai…_(d2c475fccc70a8e2).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
instances.md_-_Binary_operations_on…_-_Operations_involving…_(492b1163b8163c05).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid.md_-_Tests_for_invalid_ty…_-_Diagnostics_for_comm…_-_Module-literal_used_…_(652fec4fd4a6c63a).snap [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
invalid_argument_typ…_-_Invalid_argument_typ…_-_Basic_(16be9d90a741761).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Calls_to_methods_(4b3b8695d519a02).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Different_files_(d02c38e2dd054b4c).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Different_source_ord…_(9b0bf549733d3f0a).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Many_parameters_(ee38fd34ceba3293).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Many_parameters_acro…_(1d5d112808c49e9d).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Many_parameters_with…_(4bc5c16cd568b8ec).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Test_calling_a_funct…_(3b18271a821a59b).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Tests_for_a_variety_…_-_Keyword_only_argumen…_(8d9f18c78137411).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Tests_for_a_variety_…_-_Mix_of_arguments_(cfc64b1136058112).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Tests_for_a_variety_…_-_One_keyword_argument_(cc34b2f7d19d427e).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Tests_for_a_variety_…_-_Only_positional_(3dc93b1709eb3be9).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Tests_for_a_variety_…_-_Synthetic_arguments_(4c09844bbbf47741).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Tests_for_a_variety_…_-_Variadic_arguments_(e26a3e7b2773a63b).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
invalid_argument_typ…_-_Invalid_argument_typ…_-_Tests_for_a_variety_…_-_Variadic_keyword_arg…_(4c855e39ea6baeaf).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
membership_test.md_-_Comparison___Membersh…_-_Return_type_that_doe…_(feccf6b9da1e7cd3).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
mro.md_-_Method_Resolution_Or…_-_`__bases__`_includes…_(d2532518c44112c8).snap [ty] Split invalid-base error code into two error codes (#18245) 2025-05-21 18:02:39 -04:00
mro.md_-_Method_Resolution_Or…_-_`__bases__`_lists_th…_(6f8d0bf648c4b305).snap [ty] Split invalid-base error code into two error codes (#18245) 2025-05-21 18:02:39 -04:00
mro.md_-_Method_Resolution_Or…_-_`__bases__`_lists_wi…_(ea7ebc83ec359b54).snap [ty] Allow unions including Any/Unknown as bases (#18094) 2025-05-16 06:57:26 +02:00
mro.md_-_Method_Resolution_Or…_-_Unresolvable_MROs_in…_(e2b355c09a967862).snap [ty] Do not carry the generic context of Protocol or Generic in the ClassBase enum (#17989) 2025-05-22 21:37:03 -04:00
no_matching_overload…_-_No_matching_overload…_-_A_class_constructor_…_(dd9f8a8f736a329).snap [ty] Improve invalid method calls for unmatched overloads (#18122) 2025-05-15 11:39:14 -04:00
no_matching_overload…_-_No_matching_overload…_-_A_method_call_with_u…_(31cb5f881221158e).snap [ty] Improve invalid method calls for unmatched overloads (#18122) 2025-05-15 11:39:14 -04:00
no_matching_overload…_-_No_matching_overload…_-_Call_to_function_wit…_(dd80c593d9136f35).snap ty_python_semantic: improve failed overloaded function call 2025-05-14 11:13:41 -04:00
no_matching_overload…_-_No_matching_overload…_-_Call_to_function_wit…_(f66e3a8a3977c472).snap ty_python_semantic: improve failed overloaded function call 2025-05-14 11:13:41 -04:00
no_matching_overload…_-_No_matching_overload…_-_Calls_to_overloaded_…_(3553d085684e16a0).snap ty_python_semantic: improve failed overloaded function call 2025-05-14 11:13:41 -04:00
no_matching_overload…_-_No_matching_overload…_-_Calls_to_overloaded_…_(36814b28492c01d2).snap ty_python_semantic: improve failed overloaded function call 2025-05-14 11:13:41 -04:00
not.md_-_Unary_not_-_Object_that_implemen…_(ab3f546bf004e24d).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
overloads.md_-_Overloads_-_Invalid_-_At_least_two_overloa…_(84dadf8abd8f2f2).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
overloads.md_-_Overloads_-_Invalid_-_Inconsistent_decorat…_-_`@classmethod`_(aaa04d4cfa3adaba).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
overloads.md_-_Overloads_-_Invalid_-_Inconsistent_decorat…_-_`@final`_(f8e529ec23a61665).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
overloads.md_-_Overloads_-_Invalid_-_Inconsistent_decorat…_-_`@override`_(2df210735ca532f9).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
overloads.md_-_Overloads_-_Invalid_-_Overload_without_an_…_-_Regular_modules_(5c8e81664d1c7470).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
protocols.md_-_Protocols_-_Calls_to_protocol_cl…_(288988036f34ddcf).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
protocols.md_-_Protocols_-_Invalid_calls_to_`ge…_(3d0c4ee818c4d8d5).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
protocols.md_-_Protocols_-_Narrowing_of_protoco…_(98257e7c2300373).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
return_type.md_-_Function_return_type_-_Diagnostics_for_`inv…_(35563a74094b14d5).snap [ty] Add a subdiagnostic if invalid-return-type is emitted on a method with an empty body on a non-protocol subclass of a protocol class (#18243) 2025-05-21 17:38:07 +00:00
return_type.md_-_Function_return_type_-_Generator_functions_(d9ed06b61b14fd4c).snap [ty] Fix Inconsistent casing in diagnostic (#18084) 2025-05-14 08:26:48 +02:00
return_type.md_-_Function_return_type_-_Invalid_conditional_…_(94c036c5d3803ab2).snap [ty] Fix Inconsistent casing in diagnostic (#18084) 2025-05-14 08:26:48 +02:00
return_type.md_-_Function_return_type_-_Invalid_implicit_ret…_(393cb38bf7119649).snap [ty] Fix Inconsistent casing in diagnostic (#18084) 2025-05-14 08:26:48 +02:00
return_type.md_-_Function_return_type_-_Invalid_return_type_(a91e0c67519cd77f).snap [ty] Fix Inconsistent casing in diagnostic (#18084) 2025-05-14 08:26:48 +02:00
return_type.md_-_Function_return_type_-_Invalid_return_type_…_(c3a523878447af6b).snap [ty] Fix Inconsistent casing in diagnostic (#18084) 2025-05-14 08:26:48 +02:00
rich_comparison.md_-_Comparison___Rich_Com…_-_Chained_comparisons_…_(c391c13e2abc18a0).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
semantic_syntax_erro…_-_Semantic_syntax_erro…_-_`async`_comprehensio…_-_Python_3.10_(96aa8ec77d46553d).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
shadowing.md_-_Shadowing_-_Implicit_class_shado…_(c8ff9e3a079e8bd5).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
shadowing.md_-_Shadowing_-_Implicit_function_sh…_(a1515328b775ebc1).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
tuples.md_-_Comparison___Tuples_-_Chained_comparisons_…_(f45f1da2f8ca693d).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
tuples.md_-_Comparison___Tuples_-_Equality_with_elemen…_(39b614d4707c0661).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
union_call.md_-_Calling_a_union_of_f…_-_A_smaller_scale_exam…_(c24ecd8582e5eb2f).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
union_call.md_-_Calling_a_union_of_f…_-_Multiple_variants_bu…_(d840ac443ca8ec7f).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
union_call.md_-_Calling_a_union_of_f…_-_Try_to_cover_all_pos…_-_Cover_keyword_argume…_(ad1d489710ee2a34).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
union_call.md_-_Calling_a_union_of_f…_-_Try_to_cover_all_pos…_-_Cover_non-keyword_re…_(707b284610419a54).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unpacking.md_-_Unpacking_-_Exactly_too_few_valu…_(f920ea85eefe9cfe).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unpacking.md_-_Unpacking_-_Exactly_too_many_val…_(a53a2aec02bc999).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unpacking.md_-_Unpacking_-_Right_hand_side_not_…_(fae6e2d526396252).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unpacking.md_-_Unpacking_-_Too_few_values_to_un…_(cef19e6b2b58e6a3).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unresolved_import.md_-_Unresolved_import_di…_-_An_unresolvable_impo…_(72d090df51ea97b8).snap [ty] Add note to unresolved-import hinting to users to configure their Python environment (#18207) 2025-05-19 17:24:25 -04:00
unresolved_import.md_-_Unresolved_import_di…_-_Using_`from`_with_a_…_(12d4a70b7fc67cc6).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unresolved_import.md_-_Unresolved_import_di…_-_Using_`from`_with_an…_(6cff507dc64a1bff).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unresolved_import.md_-_Unresolved_import_di…_-_Using_`from`_with_an…_(9da56616d6332a83).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unresolved_import.md_-_Unresolved_import_di…_-_Using_`from`_with_an…_(9fa713dfa17cc404).snap [ty] Add note to unresolved-import hinting to users to configure their Python environment (#18207) 2025-05-19 17:24:25 -04:00
unresolved_import.md_-_Unresolved_import_di…_-_Using_`from`_with_to…_(4b8ba6ee48180cdd).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unresolved_reference…_-_Diagnostics_for_unre…_-_New_builtin_used_on_…_(51edda0b1aebc2bf).snap [ty] Tell the user why we inferred the Python version we inferred (#18082) 2025-05-21 11:06:27 -04:00
unsupported_bool_con…_-_Different_ways_that_…_-_Has_a_`__bool__`_att…_(2721d40bf12fe8b7).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unsupported_bool_con…_-_Different_ways_that_…_-_Has_a_`__bool__`_met…_(15636dc4074e5335).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unsupported_bool_con…_-_Different_ways_that_…_-_Has_a_`__bool__`_met…_(ce8b8da49eaf4cda).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
unsupported_bool_con…_-_Different_ways_that_…_-_Part_of_a_union_wher…_(7cca8063ea43c1a).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00
version_related_synt…_-_Version-related_synt…_-_`match`_statement_-_Before_3.10_(2545eaa83b635b8b).snap [ty] Shorten snapshot names (#18039) 2025-05-13 18:43:19 +02:00