Alex Waygood 73b1fce74a [ty] Add diagnostics for isinstance() and issubclass() calls that use invalid PEP-604 unions for their second argument (#21343) ...

## Summary

This PR adds extra validation for `isinstance()` and `issubclass()`
calls that use `UnionType` instances for their second argument.
According to typeshed's annotations, any `UnionType` is accepted for the
second argument, but this isn't true at runtime: at runtime, all
elements in the `UnionType` must either be class objects or be `None` in
order for the `isinstance()` or `issubclass()` call to reliably succeed:

```pycon
% uvx python3.14                            
Python 3.14.0 (main, Oct 10 2025, 12:54:13) [Clang 20.1.4 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from typing import LiteralString
>>> import types
>>> type(LiteralString | int) is types.UnionType
True
>>> isinstance(42, LiteralString | int)
Traceback (most recent call last):
  File "<python-input-5>", line 1, in <module>
    isinstance(42, LiteralString | int)
    ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/alexw/Library/Application Support/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/typing.py", line 559, in __instancecheck__
    raise TypeError(f"{self} cannot be used with isinstance()")
TypeError: typing.LiteralString cannot be used with isinstance()
```

## Test Plan

Added mdtests/snapshots

2025-11-10 08:46:31 +00:00

..

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_-_Diagnostics_(be8f5d8b0718ee54).snap

[ty] Infer slightly more precise types for comprehensions (#20111)

2025-08-27 13:21:47 +01:00

assert_type.md_-_`assert_type`_-_Basic_(c507788da2659ec9).snap

[ty] Use annotated parameters as type context (#20635)

2025-10-03 17:14:51 -04:00

async_for.md_-_Async_-_Error_cases_-_No_`__aiter__`_metho…_(4fbd80e21774cc23).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

async_for.md_-_Async_-_Error_cases_-_No_`__anext__`_metho…_(a0b186714127abee).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

async_for.md_-_Async_-_Error_cases_-_Possibly_missing_`__…_(33924dbae5117216).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

async_for.md_-_Async_-_Error_cases_-_Possibly_missing_`__…_(e2600ca4708d9e54).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

async_for.md_-_Async_-_Error_cases_-_Synchronously_iterab…_(80fa705b1c61d982).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

async_for.md_-_Async_-_Error_cases_-_Wrong_signature_for_…_(b614724363eec343).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

async_for.md_-_Async_-_Error_cases_-_Wrong_signature_for_…_(e1f3e9275d0a367).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

async.md_-_Async_with_statement…_-_Accidental_use_of_as…_(5b8c1b4d846bc544).snap

[ty] Diagnostics for async context managers (#19704)

2025-08-05 07:41:37 -07:00

attribute_assignment…_-_Attribute_assignment_-_`ClassVar`s_(8d7cca27987b099d).snap

Revert "[ty] Use invalid-assignment error code for invalid assignments to ClassVars" (#20158)

2025-08-29 19:48:45 +01:00

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-missing_att…_(e603e3da35f55c73).snap

[ty] Improve error messages for unresolved attribute diagnostics (#20963)

2025-10-19 10:58:25 +01:00

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

attributes.md_-_Attributes_-_Attributes_of_standa…_(49ba2c9016d64653).snap

[ty] Improve error messages for unresolved attribute diagnostics (#20963)

2025-10-19 10:58:25 +01:00

attributes.md_-_Attributes_-_Invalid_access_to_at…_(5457445ffed43a87).snap

[ty] Don't add incorrect subdiagnostic for unresolved reference (#18487)

2025-06-27 12:40:33 +00:00

basic.md_-_Structures_-_Attempting_to_import…_(2fcfcf567587a056).snap

[ty] Improve diagnostics if the user attempts to import a stdlib module that does not exist on their configured Python version (#18403)

2025-06-02 10:52:26 +00:00

basic.md_-_Structures_-_Attempting_to_import…_(c14954eefd15211f).snap

[ty] Improve diagnostics if the user attempts to import a stdlib module that does not exist on their configured Python version (#18403)

2025-06-02 10:52:26 +00:00

basic.md_-_Structures_-_Attempting_to_import…_(dba22bd97137ee38).snap

[ty] Check typeshed VERSIONS for parent modules when reporting failed stdlib imports (#20908)

2025-10-16 13:25:08 +00:00

basic.md_-_Structures_-_Multiple_objects_imp…_(cbfbf5ff94e6e104).snap

[ty] Add search paths info to unresolved import diagnostics (#20040)

2025-08-26 11:01:16 -04:00

basic.md_-_Structures_-_Unresolvable_module_…_(846453deaca1071c).snap

[ty] Add search paths info to unresolved import diagnostics (#20040)

2025-08-26 11:01:16 -04:00

basic.md_-_Structures_-_Unresolvable_submodu…_(4fad4be9778578b7).snap

[ty] Add search paths info to unresolved import diagnostics (#20040)

2025-08-26 11:01:16 -04:00

cast.md_-_`cast`_-_Diagnostic_snapshots_(91dd3d45b6d7f2c8).snap

[ty] highlight the argument in static_assert error messages (#19426)

2025-07-23 08:24:12 -07:00

dataclasses.md_-_Dataclasses_-_`dataclasses.KW_ONLY…_(dd1b8f2f71487f16).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

deprecated.md_-_Tests_for_the_`@depr…_-_Introduction_(cff2724f4c9d28c4).snap

[ty] Add support for @warnings.deprecated (#19376)

2025-07-18 23:50:29 +00:00

deprecated.md_-_Tests_for_the_`@depr…_-_Syntax_(142fa2948c3c6cf1).snap

[ty] Sync vendored typeshed stubs (#20083)

2025-08-25 17:01:51 +00:00

descriptor_protocol.…_-_Descriptor_protocol_-_Special_descriptors_-_Properties_with_no_s…_(176795bc1727dda7).snap

[ty] Better error message for attempting to assign to a read-only property (#20150)

2025-08-29 13:22:23 +00:00

final.md_-_`typing.Final`_-_Full_diagnostics_(174fdd8134fb325b).snap

[ty] Improved diagnostic for reassignments of Final symbols (#19214)

2025-07-08 20:29:07 +02:00

for.md_-_For_loops_-_`__iter__`_does_not_…_(92e3fdd69edad63d).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_`__iter__`_method_wi…_(1136c0e783d61ba4).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_`__iter__`_returns_a…_(707bd02a22c4acc8).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Bad_`__getitem__`_me…_(3ffe352bb3a76715).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

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] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Possibly_invalid_`__…_(6805a6032e504b63).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Possibly_invalid_`__…_(6388761c90a0555c).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Possibly_invalid_`__…_(c626bde8651b643a).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Possibly_missing_`__…_(9f781babda99d74b).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Possibly_missing_`__…_(77269542b8e81774).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Possibly_missing_`__…_(d8a02a0fcbb390a3).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Possibly-not-callabl…_(49a21e4b7fe6e97b).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Union_type_as_iterab…_(6177bb6d13a22241).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_Union_type_as_iterab…_(ba36fbef63a14969).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

for.md_-_For_loops_-_With_non-callable_it…_(a1cdf01ad69ac37c).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

function.md_-_Call_expression_-_Wrong_argument_type_-_Diagnostics_for_unio…_(5396a8f9e7f88f71).snap

[ty] Improve invalid-argument-type diagnostics where a union type was provided (#21044)

2025-10-23 13:16:21 +00:00

functions.md_-_Generic_functions___L…_-_Inferring_a_bound_ty…_(d50204b9d91b7bd1).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

functions.md_-_Generic_functions___L…_-_Inferring_a_constrai…_(48ab83f977c109b4).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

functions.md_-_Generic_functions___P…_-_Inferring_a_bound_ty…_(5935d14c26afe407).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

functions.md_-_Generic_functions___P…_-_Inferring_a_constrai…_(d2c475fccc70a8e2).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

instance_layout_conf…_-_Tests_for_ty's_`inst…_-_`__slots__`___incompa…_(98b54233987eb654).snap

[ty] Improve disjointness inference for NominalInstanceTypes and SubclassOfTypes (#18864)

2025-06-24 20:27:37 +00:00

instance_layout_conf…_-_Tests_for_ty's_`inst…_-_Built-ins_with_impli…_(f5857d64ce69ca1d).snap

[ty] Add support for PEP 800 (#20084)

2025-08-25 19:39:05 +01:00

instances.md_-_Binary_operations_on…_-_Operations_involving…_(492b1163b8163c05).snap

[ty] Shorten snapshot names (#18039)

2025-05-13 18:43:19 +02:00

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] Improve diagnostics for bad calls to functions (#20022)

2025-08-21 22:00:44 +01:00

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] Sync vendored typeshed stubs (#19607)

2025-07-28 22:06:33 +00:00

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] Improve diagnostics for bad calls to functions (#20022)

2025-08-21 22:00:44 +01:00

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

invalid_await.md_-_Invalid_await_diagno…_-_`__await__`_definiti…_(15b05c126b6ae968).snap

[ty] Add diagnostics for invalid await expressions (#19711)

2025-08-14 14:38:33 -07:00

invalid_await.md_-_Invalid_await_diagno…_-_`__await__`_definiti…_(ccb69f512135dd61).snap

[ty] Add diagnostics for invalid await expressions (#19711)

2025-08-14 14:38:33 -07:00

invalid_await.md_-_Invalid_await_diagno…_-_Basic_(f15db7dc447d0795).snap

[ty] Sync vendored typeshed stubs (#20876)

2025-10-15 11:13:32 +02:00

invalid_await.md_-_Invalid_await_diagno…_-_Custom_type_with_mis…_(9ce1ee3cd1c9c8d1).snap

[ty] Add diagnostics for invalid await expressions (#19711)

2025-08-14 14:38:33 -07:00

invalid_await.md_-_Invalid_await_diagno…_-_Custom_type_with_pos…_(a028edbafe180ca).snap

[ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492)

2025-09-23 14:26:55 +00:00

invalid_await.md_-_Invalid_await_diagno…_-_Invalid_union_return…_(fedf62ffaca0f2d7).snap

[ty] Add diagnostics for invalid await expressions (#19711)

2025-08-14 14:38:33 -07:00

invalid_await.md_-_Invalid_await_diagno…_-_Non-callable_`__awai…_(d78580fb6720e4ea).snap

[ty] Add diagnostics for invalid await expressions (#19711)

2025-08-14 14:38:33 -07:00

invalid.md_-_Tests_for_invalid_ty…_-_Diagnostics_for_comm…_-_List-literal_used_wh…_(f80dbf5dd571c940).snap

[ty] Add hints to invalid-type-form for common mistakes (#18543)

2025-06-09 00:40:05 +01:00

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.md_-_Tests_for_invalid_ty…_-_Diagnostics_for_comm…_-_Tuple-literal_used_w…_(f61204fc81905069).snap

[ty] Add hints to invalid-type-form for common mistakes (#18543)

2025-06-09 00:40:05 +01:00

isinstance.md_-_Narrowing_for_`isins…_-_`classinfo`_is_an_in…_(eeef56c0ef87a30b).snap

[ty] Add diagnostics for isinstance() and issubclass() calls that use invalid PEP-604 unions for their second argument (#21343)

2025-11-10 08:46:31 +00:00

issubclass.md_-_Narrowing_for_`issub…_-_`classinfo`_is_an_in…_(7bb66a0f412caac1).snap

[ty] Add diagnostics for isinstance() and issubclass() calls that use invalid PEP-604 unions for their second argument (#21343)

2025-11-10 08:46:31 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_`TypeVar`_parameter_…_(8424f2b8bc4351f9).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Boolean_parameters_m…_(3edf97b20f58fa11).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Cannot_be_both_covar…_(b7b0976739681470).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Cannot_have_both_bou…_(4ca5f13621915554).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Cannot_have_only_one…_(8b0258f5188209c6).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Invalid_feature_for_…_(72827c64b5c73d05).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Invalid_keyword_argu…_(39164266ada3dc2f).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Must_be_directly_ass…_(c2e3e46852bb268f).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Must_have_a_name_(79a4ce09338e666b).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_Name_can't_be_given_…_(8f6aed0dba79e995).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

legacy_typevars.md_-_Legacy_typevar_creat…_-_No_variadic_argument…_(9d57505425233fd8).snap

[ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598)

2025-10-09 21:08:37 +00:00

membership_test.md_-_Comparison___Membersh…_-_Return_type_that_doe…_(feccf6b9da1e7cd3).snap

[ty] Shorten snapshot names (#18039)

2025-05-13 18:43:19 +02:00

missing_argument.md_-_Missing_argument_dia…_(f0811e84fcea1085).snap

[ty] Improve diagnostics for bad calls to functions (#20022)

2025-08-21 22:00:44 +01:00

mro.md_-_Method_Resolution_Or…_-_`__bases__`_includes…_(d2532518c44112c8).snap

[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)

2025-10-27 11:19:12 +00:00

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] Fix bug where ty would think all types had an __mro__ attribute (#20995)

2025-10-27 11:19:12 +00:00

mro.md_-_Method_Resolution_Or…_-_Unresolvable_MROs_in…_(e2b355c09a967862).snap

[ty] Track different uses of legacy typevars, including context when rendering typevars (#19604)

2025-08-01 12:20:32 -04:00

named_tuple.md_-_`NamedTuple`_-_`typing.NamedTuple`_-_Definition_(bbf79630502e65e9).snap

[ty] Cover full range of annotated assignments (#20261)

2025-09-05 10:12:40 +02:00

named_tuple.md_-_`NamedTuple`_-_`typing.NamedTuple`_-_Multiple_Inheritance_(82ed33d1b3b433d8).snap

[ty] Detect illegal multiple inheritance with NamedTuple (#19943)

2025-08-18 12:03:01 +00:00

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_-_Argument_type_expans…_-_Optimization___Limit_…_(cd61048adbc17331).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

overloads.md_-_Overloads_-_Invalid_-_`@overload`-decorate…_(d17a1580f99a6402).snap

[ty] Improve diagnostics for bad @overload definitions (#20745)

2025-10-07 21:52:57 +00:00

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] Infer type of self for decorated methods and properties (#21123)

2025-10-29 21:22:38 +00:00

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] Improve diagnostics for bad @overload definitions (#20745)

2025-10-07 21:52:57 +00:00

protocols.md_-_Protocols_-_Calls_to_protocol_cl…_(288988036f34ddcf).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

protocols.md_-_Protocols_-_Diagnostics_for_prot…_(585a3e9545d41b64).snap

[ty] Fix panic when attempting to validate the members of a protocol that inherits from a protocol in another module (#20956)

2025-10-18 15:01:46 +01:00

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] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

protocols.md_-_Protocols_-_Protocol_members_in_…_(21be5d9bdab1c844).snap

[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)

2025-10-12 18:39:32 +00:00

return_type.md_-_Function_return_type_-_Diagnostics_for_`inv…_(35563a74094b14d5).snap

[ty] Add diagnosis for function with no return statement but with return type annotation (#18359)

2025-05-29 23:17:18 +00:00

return_type.md_-_Function_return_type_-_Generator_functions_-_Asynchronous_(408134055c24a538).snap

[ty] Minor: test isolation (#19597)

2025-07-28 15:52:59 +02:00

return_type.md_-_Function_return_type_-_Generator_functions_-_Synchronous_(6a32ec69d15117b8).snap

[ty] Minor: test isolation (#19597)

2025-07-28 15:52:59 +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…_(3d2d19aa49b28f1c).snap

[ty] Add diagnosis for function with no return statement but with return type annotation (#18359)

2025-05-29 23:17:18 +00:00

return_type.md_-_Function_return_type_-_Invalid_implicit_ret…_(393cb38bf7119649).snap

[ty] Add diagnosis for function with no return statement but with return type annotation (#18359)

2025-05-29 23:17:18 +00:00

return_type.md_-_Function_return_type_-_Invalid_return_type_…_(c3a523878447af6b).snap

Update default and latest Python versions for 3.14 (#20725)

2025-10-07 12:23:11 -04:00

return_type.md_-_Function_return_type_-_Invalid_return_type_(a91e0c67519cd77f).snap

[ty] Improve disambiguation of types via fully qualified names (#20141)

2025-08-29 08:44:18 +00:00

rich_comparison.md_-_Comparison___Rich_Com…_-_Chained_comparisons_…_(c391c13e2abc18a0).snap

[ty] Shorten snapshot names (#18039)

2025-05-13 18:43:19 +02:00

scoping.md_-_Scoping_rules_for_ty…_-_Nested_formal_typeva…_-_Generic_class_within…_(711fb86287c4d87b).snap

[ty] Diagnostic for generic classes that reference typevars in enclosing scope (#20822)

2025-10-13 19:30:49 -04:00

scoping.md_-_Scoping_rules_for_ty…_-_Nested_formal_typeva…_-_Generic_class_within…_(3259718bf20b45a2).snap

[ty] Diagnostic for generic classes that reference typevars in enclosing scope (#20822)

2025-10-13 19:30:49 -04:00

semantic_syntax_erro…_-_Semantic_syntax_erro…_-_`async`_comprehensio…_-_Python_3.10_(96aa8ec77d46553d).snap

Standardize syntax error construction (#20903)

2025-10-16 11:56:32 -04:00

semantic_syntax_erro…_-_Semantic_syntax_erro…_-_`break`_and_`continu…_(3143ba0a999d644).snap

[ty] continue and break statements outside loops are syntax errors (#20944)

2025-10-17 17:13:40 +00:00

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

single_matching_over…_-_Single_matching_over…_-_Call_to_function_wit…_(8fdf5a06afc7d4fe).snap

[ty] Surface matched overload diagnostic directly (#18452)

2025-06-20 08:36:49 +05:30

single_matching_over…_-_Single_matching_over…_-_Limited_number_of_ov…_(93e9a157fdca3ab2).snap

[ty] Surface matched overload diagnostic directly (#18452)

2025-06-20 08:36:49 +05:30

super.md_-_Super_-_Basic_Usage_-_Explicit_Super_Objec…_(b753048091f275c0).snap

[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)

2025-10-27 11:19:12 +00:00

super.md_-_Super_-_Basic_Usage_-_Implicit_Super_Objec…_(f9e5e48e3a4a4c12).snap

[ty] Infer type for implicit self parameters in method bodies (#20922)

2025-10-23 09:34:39 +02:00

sync.md_-_With_statements_-_Accidental_use_of_no…_(b07503f9b773ea61).snap

[ty] Diagnostics for async context managers (#19704)

2025-08-05 07:41:37 -07:00

too_many_positionals…_-_too-many-positional-…_(eafa522239b42502).snap

[ty] Improve diagnostics for bad calls to functions (#20022)

2025-08-21 22:00:44 +01:00

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

ty_extensions.md_-_`ty_extensions`_-_Diagnostic_snapshots_(662547cd88c67f9f).snap

[ty] Rename type_api => ty_extensions (#19523)

2025-07-24 08:24:26 +00:00

typed_dict.md_-_`TypedDict`_-_Diagnostics_(e5289abf5c570c29).snap

[ty] dict is not assignable to TypedDict (#21238)

2025-11-03 16:57:49 -05:00

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] eliminate is_fully_static (#18799)

2025-06-24 18:02:05 -07:00

union_call.md_-_Calling_a_union_of_f…_-_Try_to_cover_all_pos…_-_Cover_non-keyword_re…_(707b284610419a54).snap

[ty] Truncate type display for long unions in some situations (#20730)

2025-10-08 11:21:26 +01:00

union_call.md_-_Calling_a_union_of_f…_-_Try_to_cover_all_pos…_-_Truncation_for_long_…_(ec94b5e857284ef3).snap

[ty] Truncate Literal type display in some situations (#20928)

2025-10-17 11:50:58 +00:00

unknown_argument.md_-_Unknown_argument_dia…_(f419c2a8e2ce2412).snap

[ty] Improve diagnostics for bad calls to functions (#20022)

2025-08-21 22:00:44 +01:00

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] Support variable-length tuples in unpacking assignments (#18948)

2025-06-27 15:29:04 -04:00

unresolved_import.md_-_Unresolved_import_di…_-_An_unresolvable_impo…_(72d090df51ea97b8).snap

[ty] Add search paths info to unresolved import diagnostics (#20040)

2025-08-26 11:01:16 -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 search paths info to unresolved import diagnostics (#20040)

2025-08-26 11:01:16 -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

Standardize syntax error construction (#20903)

2025-10-16 11:56:32 -04:00