Dhruv Manilawala ef4108af2a [ty] Generate the top and bottom materialization of a type (#18594) ... ## Summary This is to support https://github.com/astral-sh/ruff/pull/18607. This PR adds support for generating the top materialization (or upper bound materialization) and the bottom materialization (or lower bound materialization) of a type. This is the most general and the most specific form of the type which is fully static, respectively. More concretely, `T'`, the top materialization of `T`, is the type `T` with all occurrences of dynamic type (`Any`, `Unknown`, `@Todo`) replaced as follows: - In covariant position, it's replaced with `object` - In contravariant position, it's replaced with `Never` - In invariant position, it's replaced with an unresolved type variable (For an invariant position, it should actually be replaced with an existential type, but this is not currently representable in our type system, so we use an unresolved type variable for now instead.) The bottom materialization is implemented in the same way, except we start out in "contravariant" position. ## Test Plan Add test cases for various types.		2025-06-12 12:06:16 +05:30
..
annotations	[ty] Fix panic when trying to pull types for subscript expressions inside Callable type expressions (#18534)	2025-06-09 11:26:10 +01:00
assignment	[ty] Add hint that PEP 604 union syntax is only available in 3.10+ (#18192)	2025-05-19 19:47:31 +02:00
binary	[ty] Minor tweaks to "list all members" docs and tests (#18388)	2025-05-30 13:36:57 -04:00
boolean	Revert "[ty] Better control flow for boolean expressions that are inside if (#18010)" (#18150)	2025-05-17 08:27:32 -04:00
boundness_declaredness	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
call	[ty] Argument type expansion for overload call evaluation (#18382)	2025-06-04 02:12:00 +00:00
class	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
comparison	[ty] Fix binary intersection comparison inference logic (#18266)	2025-05-23 12:55:17 +02:00
comprehensions
conditional
declaration
diagnostics	[ty] Don't warn yield not in function when yield is in function (#18008)	2025-05-21 18:16:25 +02:00
directives	[ty] Fix normalization of unions containing instances parameterized with unions (#18112)	2025-05-14 22:48:33 -04:00
doc	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
exception	[ty] Raise invalid-exception-caught even when exception is not captured (#18202)	2025-05-19 18:13:34 -04:00
expression	[ty] Treat lambda functions as instances of types.FunctionType (#18431)	2025-06-02 16:46:26 +01:00
function	[ty] Add diagnosis for function with no return statement but with return type annotation (#18359)	2025-05-29 23:17:18 +00:00
generics	[ty] Add meta-type tests for legavy TypeVars (#18453)	2025-06-04 07:44:44 +00:00
ide_support	[ty] Minor tweaks to "list all members" docs and tests (#18388)	2025-05-30 13:36:57 -04:00
import	[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
literal	[ty] Understand classes that inherit from subscripted Protocol[] as generic (#17832)	2025-05-09 17:39:15 +01:00
loops
narrow	[ty] type narrowing by attribute/subscript assignments (#18041)	2025-06-04 17:24:27 -07:00
regression
scopes	[ty] Add support for global __debug__ constant (#18540)	2025-06-10 06:48:59 +00:00
shadowing
snapshots	[ty] Add hints to invalid-type-form for common mistakes (#18543)	2025-06-09 00:40:05 +01:00
stubs	[ty] Do not carry the generic context of Protocol or Generic in the ClassBase enum (#17989)	2025-05-22 21:37:03 -04:00
subscript	[ty] Do not carry the generic context of Protocol or Generic in the ClassBase enum (#17989)	2025-05-22 21:37:03 -04:00
suppressions
type_compendium	[ty] Type compendium (#18263)	2025-05-23 11:41:31 +02:00
type_of	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
type_properties	[ty] Generate the top and bottom materialization of a type (#18594)	2025-06-12 12:06:16 +05:30
type_qualifiers
unary	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
with	[ty] Add hint if async context manager is used in non-async with statement (#18299)	2025-05-26 21:34:47 +02:00
.mdformat.toml
attributes.md	[ty] type narrowing by attribute/subscript assignments (#18041)	2025-06-04 17:24:27 -07:00
cycle.md	[ty] Add cycle handling for unpacking targets (#18078)	2025-05-13 21:27:48 +00:00
dataclass_transform.md	[ty] Detect overloads decorated with @dataclass_transform (#17835)	2025-05-07 15:51:13 +02:00
dataclasses.md	[ty] dataclasses: Allow using dataclasses.dataclass as a function. (#18440)	2025-06-03 09:50:29 -07:00
decorators.md	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
descriptor_protocol.md	[ty] type narrowing by attribute/subscript assignments (#18041)	2025-06-04 17:24:27 -07:00
final.md
intersection_types.md	[ty] Unify Type::is_subtype_of() and Type::is_assignable_to() (#18430)	2025-06-06 17:28:55 +00:00
invalid_syntax.md
known_constants.md
mdtest_config.md
mdtest_custom_typeshed.md
metaclass.md	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
mro.md	[ty] Implement implicit inheritance from Generic[] for PEP-695 generic classes (#18283)	2025-05-26 20:40:16 +01:00
named_tuple.md	[ty] Add generic inference for dataclasses (#18443)	2025-06-03 09:59:43 -07:00
overloads.md
pep695_type_aliases.md	[ty] Support typing.TypeAliasType (#18156)	2025-05-19 16:36:49 +02:00
properties.md	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
protocols.md	[ty] Unify Type::is_subtype_of() and Type::is_assignable_to() (#18430)	2025-06-06 17:28:55 +00:00
slots.md
statically_known_branches.md	Fix typos (#17988)	2025-05-09 14:57:14 -04:00
sys_platform.md
sys_version_info.md
terminal_statements.md
type_api.md	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
typed_dict.md
union_types.md
unpacking.md	[ty] Add tests for empty list/tuple unpacking (#18451)	2025-06-04 02:40:26 +00:00
unreachable.md