David Peter db3dcd8ad6 [ty] Eagerly simplify 'True' and 'False' constraints (#18998) ... ## Summary Simplifies literal `True` and `False` conditions to `ALWAYS_TRUE` / `ALWAYS_FALSE` during semantic index building. This allows us to eagerly evaluate more constraints, which should help with performance (looks like there is a tiny 1% improvement in instrumented benchmarks), but also allows us to eliminate definitely-unreachable branches in control-flow merging. This can lead to better type inference in some cases because it allows us to retain narrowing constraints without solving https://github.com/astral-sh/ty/issues/690 first: ```py def _(c: int | None): if c is None: assert False reveal_type(c) # int, previously: int | None ``` closes https://github.com/astral-sh/ty/issues/713 ## Test Plan * Regression test for https://github.com/astral-sh/ty/issues/713 * Made sure that all ecosystem diffs trace back to removed false positives		2025-06-30 13:11:52 +02:00
..
annotations	[ty] Emit error for invalid binary operations in type expressions (#18991)	2025-06-30 10:06:01 +02:00
assignment	[ty] Homogeneous and mixed tuples (#18600)	2025-06-20 18:23:54 -04:00
binary	[ty] Homogeneous and mixed tuples (#18600)	2025-06-20 18:23:54 -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
call	[ty] Add special-cased inference for __import__(name) and importlib.import_module(name) (#19008)	2025-06-29 11:49:23 +01:00
class
comparison	[ty] Fix binary intersection comparison inference logic (#18266)	2025-05-23 12:55:17 +02:00
comprehensions
conditional	[ty] Improve disjointness inference for NominalInstanceTypes and SubclassOfTypes (#18864)	2025-06-24 20:27:37 +00:00
declaration	[ty] Format conflicting types as an enumeration (#18956)	2025-06-26 14:29:33 +02:00
diagnostics	[ty] Surface matched overload diagnostic directly (#18452)	2025-06-20 08:36:49 +05:30
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] support del statement and deletion of except handler names (#18593)	2025-06-12 07:44:42 -07:00
expression	[ty] Make tuple instantiations sound (#18987)	2025-06-27 19:37:16 +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] Improve protocol member type checking and relation handling (#18847)	2025-06-29 10:46:33 +00:00
ide_support	[ty] Minor tweaks to "list all members" docs and tests (#18388)	2025-05-30 13:36:57 -04:00
import	Revert "[ty] Offer "Did you mean...?" suggestions for unresolved from imports and unresolved attributes (#18705)" (#18721)	2025-06-17 15:48:09 +01:00
literal	[ty] Understand classes that inherit from subscripted Protocol[] as generic (#17832)	2025-05-09 17:39:15 +01:00
loops
narrow	[ty] Eagerly simplify 'True' and 'False' constraints (#18998)	2025-06-30 13:11:52 +02:00
regression
scopes	[ty] Infer nonlocal types as unions of all reachable bindings (#18750)	2025-06-26 12:24:40 +02:00
shadowing
snapshots	[ty] Support variable-length tuples in unpacking assignments (#18948)	2025-06-27 15:29:04 -04:00
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] Fix false positives when subscripting an object inferred as having an Intersection type (#18920)	2025-06-24 18:39:02 +00:00
suppressions
type_compendium	[ty] Make tuple instantiations sound (#18987)	2025-06-27 19:37:16 +01:00
type_of
type_properties	[ty] Emit error for invalid binary operations in type expressions (#18991)	2025-06-30 10:06:01 +02:00
type_qualifiers	[ty] Fix panics when pulling types for ClassVar or Final parameterized with >1 argument (#18824)	2025-06-20 18:06:40 +01:00
unary
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] Don't add incorrect subdiagnostic for unresolved reference (#18487)	2025-06-27 12:40:33 +00:00
cycle.md	[ty] Add cycle handling for unpacking targets (#18078)	2025-05-13 21:27:48 +00:00
dataclass_transform.md
dataclasses.md	[ty] eliminate is_fully_static (#18799)	2025-06-24 18:02:05 -07:00
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] support del statement and deletion of except handler names (#18593)	2025-06-12 07:44:42 -07:00
descriptor_protocol.md	[ty] Add support for @staticmethods (#18809)	2025-06-20 10:38:17 +02:00
final.md
instance_layout_conflict.md	[ty] Improve disjointness inference for NominalInstanceTypes and SubclassOfTypes (#18864)	2025-06-24 20:27:37 +00:00
intersection_types.md	[ty] eliminate is_fully_static (#18799)	2025-06-24 18:02:05 -07:00
invalid_syntax.md
known_constants.md
mdtest_config.md
mdtest_custom_typeshed.md
metaclass.md
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	[ty] Add support for @staticmethods (#18809)	2025-06-20 10:38:17 +02:00
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] Improve protocol member type checking and relation handling (#18847)	2025-06-29 10:46:33 +00:00
public_types.md	[ty] Infer nonlocal types as unions of all reachable bindings (#18750)	2025-06-26 12:24:40 +02:00
statically_known_branches.md	[ty] Infer nonlocal types as unions of all reachable bindings (#18750)	2025-06-26 12:24:40 +02:00
sys_platform.md
sys_version_info.md
terminal_statements.md	[ty] Infer nonlocal types as unions of all reachable bindings (#18750)	2025-06-26 12:24:40 +02:00
type_api.md	[ty] eliminate is_fully_static (#18799)	2025-06-24 18:02:05 -07:00
typed_dict.md
union_types.md	[ty] eliminate is_fully_static (#18799)	2025-06-24 18:02:05 -07:00
unpacking.md	[ty] Support variable-length tuples in unpacking assignments (#18948)	2025-06-27 15:29:04 -04:00
unreachable.md	[ty] Infer nonlocal types as unions of all reachable bindings (#18750)	2025-06-26 12:24:40 +02:00