ruff/crates/ty_python_semantic/resources/mdtest
Jelle Zijlstra de63f408b9
[ty] Attribute access on top/bottom materializations (#20221)
## Summary

Part of astral-sh/ty#994. The goal of this PR was to add correct
behavior for attribute access on the top and bottom materializations.
This is necessary for the end goal of using the top materialization for
narrowing generics (`isinstance(x, list)`): we want methods like
`x.append` to work correctly in that case.

It turned out to be convenient to represent materialization as a
TypeMapping, so it can be stashed in the `type_mappings` list of a
function object. This also allowed me to remove most concrete
`materialize` methods, since they usually just delegate to the subparts
of the type, the same as other type mappings. That is why the net effect
of this PR is to remove a few hundred lines.

## Test Plan

I added a few more tests. Much of this PR is refactoring and covered by
existing tests.

## Followups

Assigning to attributes of top materializations is not yet covered. This
seems less important so I'd like to defer it.

I noticed that the `materialize` implementation of `Parameters` was
wrong; it did the same for the top and bottom materializations. This PR
makes the bottom materialization slightly more reasonable, but
implementing this correctly will require extending the struct.
2025-09-04 12:01:44 -07:00
..
annotations [syntax-errors] Detect yield from inside async function (#20051) 2025-09-03 10:13:05 -04:00
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
call [ty] Support __init_subclass__ (#20190) 2025-09-01 10:16:28 +02:00
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] correctly ignore field specifiers when not specified (#20002) 2025-08-20 11:33:23 -07:00
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
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 functions for revealing assignability/subtyping constraints (#20217) 2025-09-03 16:44:35 -04:00
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] Fix small test typo (#20220) 2025-09-03 15:24:17 -07:00
regression
scopes [ty] fix deferred name loading in PEP695 generic classes/functions (#19888) 2025-08-13 15:51:59 -07:00
shadowing
snapshots Revert "[ty] Use invalid-assignment error code for invalid assignments to ClassVars" (#20158) 2025-08-29 19:48:45 +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] __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] Attribute access on top/bottom materializations (#20221) 2025-09-04 12:01:44 -07:00
type_qualifiers Revert "[ty] Use invalid-assignment error code for invalid assignments to ClassVars" (#20158) 2025-08-29 19:48:45 +01:00
unary
with [ty] Diagnostics for async context managers (#19704) 2025-08-05 07:41:37 -07:00
.mdformat.toml
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
decorators.md
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] Add precise iteration and unpacking inference for string literals and bytes literals (#20023) 2025-08-22 19:33:08 +01:00
final.md
instance_layout_conflict.md [ty] Add support for PEP 800 (#20084) 2025-08-25 19:39:05 +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
known_constants.md
mdtest_config.md
mdtest_custom_typeshed.md [ty] Remove Type::Tuple (#19669) 2025-08-11 22:03:32 +01:00
metaclass.md
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] improve cycle-detection coverage for apply_type_mapping (#20159) 2025-08-29 16:20:07 -07:00
properties.md
protocols.md [ty] Add functions for revealing assignability/subtyping constraints (#20217) 2025-09-03 16:44:35 -04:00
public_types.md [ty] improve lazy scope place lookup (#19321) 2025-07-25 07:11:11 +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
sys_version_info.md
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] More tests for TypedDict (#20205) 2025-09-04 15:55:42 +00:00
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