Shunsuke Shibayama 08a561fc05 [ty] more precise lazy scope place lookup (#19932) ...

## Summary

This is a follow-up to https://github.com/astral-sh/ruff/pull/19321.

Now lazy snapshots are updated to take into account new bindings on
every symbol reassignment.

```python
def outer(x: A | None):
    if x is None:
        x = A()

    reveal_type(x)  # revealed: A

    def inner() -> None:
        # lazy snapshot: {x: A}
        reveal_type(x)  # revealed: A
    inner()

def outer() -> None:
    x = None

    x = 1

    def inner() -> None:
        # lazy snapshot: {x: Literal[1]} -> {x: Literal[1, 2]}
        reveal_type(x)  # revealed: Literal[1, 2]
    inner()

    x = 2
```

Closes astral-sh/ty#559.

## Test Plan

Some TODOs in `public_types.md` now work properly.

---------

Co-authored-by: Carl Meyer <carl@astral.sh>

2025-09-08 21:08:35 +00:00

..

annotations

[ty] Fall back to object for attribute access on synthesized protocols (#20286)

2025-09-08 13:04:37 +01:00

assignment

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

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

binary

[ty] Remove special casing for string-literal-in-tuple __contains__ (#19642)

2025-07-31 11:28:03 +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

Update class literal display to use <class 'Foo'> style (#17889)

2025-05-06 20:11:25 -04:00

call

[ty] Implement the legacy PEP-484 convention for indicating positional-only parameters (#20248)

2025-09-05 17:56:06 +01:00

class

[ty] Remove use of ClassBase::try_from_type from super() machinery (#19902)

2025-08-14 22:14:31 +01:00

comparison

[ty] Enum literal types (#19328)

2025-07-15 21:31:53 +02:00

comprehensions

[ty] Async for loops and async iterables (#19634)

2025-07-30 17:40:24 +02:00

conditional

[ty] Support as-patterns in reachability analysis (#19728)

2025-08-04 20:13:50 +02:00

dataclasses

[ty] initial support for slots=True in dataclasses (#20278)

2025-09-07 18:25:35 +01:00

declaration

[ty] Format conflicting types as an enumeration (#18956)

2025-06-26 14:29:33 +02:00

diagnostics

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

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

directives

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

2025-08-27 13:21:47 +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] Use separate Rust types for bound and unbound type variables (#19796)

2025-08-11 15:29:58 -04:00

expression

[ty] Support async/await, async with and yield from (#19595)

2025-07-30 11:51:21 +02:00

function

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

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

generics

[ty] Add support for generic PEP695 type aliases (#20219)

2025-09-08 13:26:21 -07:00

ide_support

[ty] Fix attribute access on TypedDicts (#19758)

2025-08-05 13:59:10 +02:00

import

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

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

literal

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

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

loops

[ty] Add precise iteration and unpacking inference for string literals and bytes literals (#20023)

2025-08-22 19:33:08 +01:00

narrow

[ty] more precise lazy scope place lookup (#19932)

2025-09-08 21:08:35 +00:00

regression

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

scopes

[ty] fix deferred name loading in PEP695 generic classes/functions (#19888)

2025-08-13 15:51:59 -07:00

shadowing

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

snapshots

[ty] Add backreferences to TypedDict items in diagnostics (#20262)

2025-09-05 12:38:37 +02:00

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] __class_getitem__ is a classmethod (#20192)

2025-09-01 11:22:19 +02:00

suppressions

[ty] Consistent use of American english (in rules) (#19488)

2025-07-22 16:10:38 +02:00

type_compendium

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

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

type_of

[ty] Improve the Display for generic type[] types (#19667)

2025-07-31 19:45:01 +01:00

type_properties

[ty] initial support for slots=True in dataclasses (#20278)

2025-09-07 18:25:35 +01:00

type_qualifiers

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

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

unary

Update class literal display to use <class 'Foo'> style (#17889)

2025-05-06 20:11:25 -04:00

with

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

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

.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

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

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

classes.md

[ty] don't assume that deferred type inference means deferred name resolution (#20160)

2025-08-29 16:19:45 -07:00

cycle.md

[ty] Add cycle handling for unpacking targets (#18078)

2025-05-13 21:27:48 +00:00

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

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

deprecated.md

[ty] Consistent use of American english (in rules) (#19488)

2025-07-22 16:10:38 +02:00

descriptor_protocol.md

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

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

enums.md

[ty] Infer the correct type of Enum __eq__ and __ne__ comparisions (#19666)

2025-08-18 19:45:44 +02:00

exhaustiveness_checking.md

[ty] Narrow specialized generics using isinstance() (#20256)

2025-09-04 15:28:33 -07:00

final.md

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

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] Expansion of enums into unions of literals (#19382)

2025-07-21 19:37:55 +02:00

invalid_syntax.md

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

known_constants.md

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

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

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

named_tuple.md

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

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

overloads.md

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

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

pep695_type_aliases.md

[ty] Add support for generic PEP695 type aliases (#20219)

2025-09-08 13:26:21 -07:00

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] Implement the legacy PEP-484 convention for indicating positional-only parameters (#20248)

2025-09-05 17:56:06 +01:00

public_types.md

[ty] more precise lazy scope place lookup (#19932)

2025-09-08 21:08:35 +00:00

statically_known_branches.md

[ty] Evaluate reachability of non-definitely-bound to Ambiguous (#19579)

2025-08-28 14:34:49 +02:00

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] Rename type_api => ty_extensions (#19523)

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

typed_dict.md

[ty] Minor: 'can not' => cannot (#20260)

2025-09-05 09:19:14 +02:00

union_types.md

[ty] Expansion of enums into unions of literals (#19382)

2025-07-21 19:37:55 +02:00

unpacking.md

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

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

unreachable.md

[ty] improve lazy scope place lookup (#19321)

2025-07-25 07:11:11 +00:00