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[ty] Include NamedTupleFallback members in NamedTuple instance completions (#20356)

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## Summary

Fixes https://github.com/astral-sh/ty/issues/1161

Include `NamedTupleFallback` members in `NamedTuple` instance
completions.

- Augment instance attribute completions when completing on NamedTuple
instances by merging members from
`_typeshed._type_checker_internals.NamedTupleFallback`

## Test Plan

Adds a minimal completion test `namedtuple_fallback_instance_methods`

---------

Co-authored-by: David Peter <mail@david-peter.de>
This commit is contained in:
Takayuki Maeda 2025-09-15 18:00:03 +09:00 • committed by GitHub
parent 02c58f1beb
commit 093fa72656
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52
crates/ty_python_semantic/resources/mdtest/ide_support/all_members.md
View file

@ -238,6 +238,58 @@ def _(t_person: type[Person]):
static_assert(has_member(t_person, "keys"))
```
### NamedTuples
```py
from ty_extensions import has_member, static_assert
from typing import NamedTuple, Generic, TypeVar
class Person(NamedTuple):
id: int
name: str
static_assert(has_member(Person, "id"))
static_assert(has_member(Person, "name"))
static_assert(has_member(Person, "_make"))
static_assert(has_member(Person, "_asdict"))
static_assert(has_member(Person, "_replace"))
def _(person: Person):
static_assert(has_member(person, "id"))
static_assert(has_member(person, "name"))
static_assert(has_member(person, "_make"))
static_assert(has_member(person, "_asdict"))
static_assert(has_member(person, "_replace"))
def _(t_person: type[Person]):
static_assert(has_member(t_person, "id"))
static_assert(has_member(t_person, "name"))
static_assert(has_member(t_person, "_make"))
static_assert(has_member(t_person, "_asdict"))
static_assert(has_member(t_person, "_replace"))
T = TypeVar("T")
class Box(NamedTuple, Generic[T]):
item: T
static_assert(has_member(Box, "item"))
static_assert(has_member(Box, "_make"))
static_assert(has_member(Box, "_asdict"))
static_assert(has_member(Box, "_replace"))
def _(box: Box[int]):
static_assert(has_member(box, "item"))
static_assert(has_member(box, "_make"))
static_assert(has_member(box, "_asdict"))
static_assert(has_member(box, "_replace"))
```
### Unions
For unions, `ide_support::all_members` only returns members that are available on all elements of