Douglas Creager 97935518e9 [ty] Create a specialization from a constraint set (#21414) ... This patch lets us create specializations from a constraint set. The constraint encodes the restrictions on which types each typevar can specialize to. Given a generic context and a constraint set, we iterate through all of the generic context's typevars. For each typevar, we abstract the constraint set so that it only mentions the typevar in question (propagating derived facts if needed). We then find the "best representative type" for the typevar given the abstracted constraint set. When considering the BDD structure of the abstracted constraint set, each path from the BDD root to the `true` terminal represents one way that the constraint set can be satisfied. (This is also one of the clauses in the DNF representation of the constraint set's boolean formula.) Each of those paths is the conjunction of the individual constraints of each internal node that we traverse as we walk that path, giving a single lower/upper bound for the path. We use the upper bound as the "best" (i.e. "closest to `object`") type for that path. If there are multiple paths in the BDD, they technically represent independent possible specializations. If there's a single specialization that satisfies all of them, we will return that as the specialization. If not, then the constraint set is ambiguous. (This happens most often with constrained typevars.) We could in the future turn _each_ of the paths into separate specializations, but it's not clear what we would do with that, so instead we just report the ambiguity as a specialization failure.		2025-11-19 14:20:33 -05:00
..
annotations	[ty] Create a specialization from a constraint set (#21414)	2025-11-19 14:20:33 -05:00
assignment	[ty] Custom concise diagnostic messages (#21498)	2025-11-18 09:35:40 +01:00
binary	[ty] Rename `UnionType` to `types.UnionType` (#21262)	2025-11-03 22:06:56 +01:00
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	[ty] Reformulation of public symbol inference test suite (#20667)	2025-10-01 14:26:17 +02:00
call	[ty] Sync vendored typeshed stubs (#21466)	2025-11-15 17:12:32 +00:00
class	[ty] implement `typing.NewType` by adding `Type::NewTypeInstance`	2025-11-10 14:55:47 -08:00
comparison	[ty] detect cycles in binary comparison inference (#20446)	2025-09-17 09:45:25 +02:00
comprehensions	[ty] fix global symbol lookup from eager scopes (#21317)	2025-11-12 10:15:51 -08:00
conditional	[ty] Support as-patterns in reachability analysis (#19728)	2025-08-04 20:13:50 +02:00
dataclasses	[ty] Dataclasses: `__hash__` semantics and `unsafe_hash` (#21470)	2025-11-16 09:52:30 +00:00
declaration	[ty] Format conflicting types as an enumeration (#18956)	2025-06-26 14:29:33 +02:00
diagnostics	[ty] Better invalid-assignment diagnostics (#21476)	2025-11-18 14:31:04 +01:00
directives	[ty] Custom concise diagnostic messages (#21498)	2025-11-18 09:35:40 +01:00
doc	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
exception	[ty] Improve diagnostics for invalid exceptions (#21475)	2025-11-15 22:12:00 +00:00
expression	[ty] Use "cannot" consistently over "can not" (#21255)	2025-11-03 10:38:20 -05:00
function	[ty] Sync vendored typeshed stubs (#21466)	2025-11-15 17:12:32 +00:00
generics	[ty] Create a specialization from a constraint set (#21414)	2025-11-19 14:20:33 -05:00
ide_support	[ty] Fixup a few details around version-specific dataclass features (#21453)	2025-11-14 15:04:55 +00:00
import	[ty] Consider `from thispackage import y` to re-export `y` in `__init__.pyi` (#21387)	2025-11-11 14:41:14 -05:00
literal	[ty] Type inference for genererator expressions (#21437)	2025-11-14 13:04:11 +00:00
loops	[ty] Fix bug where ty would think all types had an `__mro__` attribute (#20995)	2025-10-27 11:19:12 +00:00
narrow	[ty] Subscript assignment diagnostics follow-up (#21452)	2025-11-17 11:14:58 +00:00
regression	[ty] fix global symbol lookup from eager scopes (#21317)	2025-11-12 10:15:51 -08:00
scopes	[ty] Make `__getattr__` available for `ModuleType` instances (#21450)	2025-11-14 13:59:14 +01:00
shadowing	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00
snapshots	[ty] Better invalid-assignment diagnostics (#21476)	2025-11-18 14:31:04 +01:00
stubs	[ty] Better invalid-assignment diagnostics (#21476)	2025-11-18 14:31:04 +01:00
subscript	[ty] Subscript assignment diagnostics follow-up (#21452)	2025-11-17 11:14:58 +00:00
suppressions	[ty] Better invalid-assignment diagnostics (#21476)	2025-11-18 14:31:04 +01:00
type_compendium	[ty] Improve literal promotion heuristics (#21439)	2025-11-14 16:13:56 -05:00
type_of	[ty] Support `type[…]` and `Type[…]` in implicit type aliases (#21421)	2025-11-13 19:02:24 +01:00
type_properties	[ty] Better handling of "derived information" in constraint sets (#21463)	2025-11-18 12:02:25 -05:00
type_qualifiers	[ty] Fix false positive for Final attribute assignment in __init__ (#21158)	2025-11-11 12:54:05 -08:00
unary	Update class literal display to use `<class 'Foo'>` style (#17889)	2025-05-06 20:11:25 -04:00
with	[ty] Use `typing.Self` for the first parameter of instance methods (#20517)	2025-09-29 21:08:08 +02:00
.mdformat.toml	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00
async.md	[ty] Support `async`/`await`, `async with` and `yield from` (#19595)	2025-07-30 11:51:21 +02:00
attributes.md	[ty] Skip eagerly evaluated scopes for attribute storing (#20856)	2025-11-11 14:45:34 -08:00
bidirectional.md	[ty] Improve literal promotion heuristics (#21439)	2025-11-14 16:13:56 -05:00
classes.md	[ty] Fix bug where ty would think all types had an `__mro__` attribute (#20995)	2025-10-27 11:19:12 +00:00
cycle.md	[ty] Avoid ever-growing default types (#20991)	2025-10-21 19:13:36 +02:00
decorators.md	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
del.md	[ty] No union with `Unknown` for module-global symbols (#20664)	2025-10-01 16:40:30 +02:00
deprecated.md	[ty] Consistent use of American english (in rules) (#19488)	2025-07-22 16:10:38 +02:00
descriptor_protocol.md	[ty] Use the return type of `__get__` for descriptor lookups even when `__get__` is called with incorrect arguments (#21424)	2025-11-13 12:05:10 +00:00
enums.md	[ty] Custom concise diagnostic messages (#21498)	2025-11-18 09:35:40 +01:00
exhaustiveness_checking.md	[ty] Improve exhaustiveness analysis for type variables with bounds or constraints (#21172)	2025-10-31 16:51:11 -04:00
final.md	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00
implicit_type_aliases.md	[ty] Add tests for generic implicit type aliases (#21522)	2025-11-19 14:06:18 +00:00
instance_layout_conflict.md	[ty] initial support for `slots=True` in dataclasses (#20278)	2025-09-07 18:25:35 +01:00
intersection_types.md	[ty] Use "cannot" consistently over "can not" (#21255)	2025-11-03 10:38:20 -05:00
invalid_syntax.md	[ty] Implicit type aliases: Add support for `typing.Union` (#21363)	2025-11-12 12:59:14 +01:00
known_constants.md	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00
literal_promotion.md	[ty] Improve literal promotion heuristics (#21439)	2025-11-14 16:13:56 -05:00
mdtest_config.md	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00
mdtest_custom_typeshed.md	[ty] Remove `Type::Tuple` (#19669)	2025-08-11 22:03:32 +01:00
metaclass.md	Update class literal display to use `<class 'Foo'>` style (#17889)	2025-05-06 20:11:25 -04:00
mro.md	[ty] Sync vendored typeshed stubs (#21466)	2025-11-15 17:12:32 +00:00
named_tuple.md	[ty] Fix bug where ty would think all types had an `__mro__` attribute (#20995)	2025-10-27 11:19:12 +00:00
overloads.md	[ty] Infer type of `self` for decorated methods and properties (#21123)	2025-10-29 21:22:38 +00:00
paramspec.md	[ty] Ensure annotation/type expressions in stub files are always deferred (#21401)	2025-11-13 17:14:54 +00:00
pep613_type_aliases.md	[ty] Further improve details around which expressions should be deferred in stub files (#21456)	2025-11-14 21:07:02 +00:00
pep695_type_aliases.md	[ty] Add cycle handling to `lazy_default` (#20967)	2025-10-23 10:05:08 +02:00
properties.md	[ty] Use the return type of `__get__` for descriptor lookups even when `__get__` is called with incorrect arguments (#21424)	2025-11-13 12:05:10 +00:00
protocols.md	[ty] Constraint sets compare generic callables correctly (#21392)	2025-11-17 13:43:37 -05:00
public_types.md	[ty] Disambiguate classes that live in different modules but have the same fully qualified names (#20756)	2025-10-08 18:27:40 +01:00
statically_known_branches.md	[ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492)	2025-09-23 14:26:55 +00:00
sys_platform.md	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00
sys_version_info.md	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00
t_strings.md	[ty] Add support for PEP 750 t-strings (#20085)	2025-08-25 18:49:49 +00:00
terminal_statements.md	[ty] improve lazy scope place lookup (#19321)	2025-07-25 07:11:11 +00:00
ty_extensions.md	[ty] Use "cannot" consistently over "can not" (#21255)	2025-11-03 10:38:20 -05:00
typed_dict.md	[ty] Custom concise diagnostic messages (#21498)	2025-11-18 09:35:40 +01:00
union_types.md	[ty] Introduce `TypeRelation::Redundancy` (#20602)	2025-10-03 18:35:30 +01:00
unpacking.md	[ty] Infer more precise types for collection literals (#20360)	2025-09-17 18:51:50 -04:00
unreachable.md	[ty] Use "cannot" consistently over "can not" (#21255)	2025-11-03 10:38:20 -05:00