[pyupgrade] Fix UP043 to apply to collections.abc.Generator and `…

…collections.abc.AsyncGenerator` (#13611)

## Summary

fix #13602 

Currently, `UP043` only applies to typing.Generator, but it should also
support collections.abc.Generator.

This update ensures `UP043` correctly handles both
`collections.abc.Generator` and `collections.abc.AsyncGenerator`

### UP043
> `UP043`
> Python 3.13 introduced the ability for type parameters to specify
default values. As such, the default type arguments for some types in
the standard library (e.g., Generator, AsyncGenerator) are now optional.
> Omitting type parameters that match the default values can make the
code more concise and easier to read.

```py
Generator[int, None, None] -> Generator[int]
```

crates/ruff_linter/resources/test/fixtures/pyupgrade/UP043.py

@@ -1,4 +1,4 @@
-from typing import Generator, AsyncGenerator
+from collections.abc import Generator, AsyncGenerator
 
 
 def func() -> Generator[int, None, None]:
@@ -39,3 +39,14 @@ async def func() -> AsyncGenerator[int]:
 async def func() -> AsyncGenerator[int, int]:
     foo = yield 42
     return foo
+
+
+from typing import Generator, AsyncGenerator
+
+
+def func() -> Generator[str, None, None]:
+    yield "hello"
+
+
+async def func() -> AsyncGenerator[str, None]:
+    yield "hello"

crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_default_type_args.rs

@@ -19,7 +19,7 @@ use crate::checkers::ast::Checker;
 /// ## Examples
 ///
 /// ```python
-/// from typing import Generator, AsyncGenerator
+/// from collections.abc import Generator, AsyncGenerator
 ///
 ///
 /// def sync_gen() -> Generator[int, None, None]:
@@ -33,7 +33,7 @@ use crate::checkers::ast::Checker;
 /// Use instead:
 ///
 /// ```python
-/// from typing import Generator, AsyncGenerator
+/// from collections.abc import Generator, AsyncGenerator
 ///
 ///
 /// def sync_gen() -> Generator[int]:
@@ -47,6 +47,7 @@ use crate::checkers::ast::Checker;
 /// ## References
 ///
 /// - [PEP 696 – Type Defaults for Type Parameters](https://peps.python.org/pep-0696/)
+/// - [Annotating generators and coroutines](https://docs.python.org/3.13/library/typing.html#annotating-generators-and-coroutines)
 /// - [typing.Generator](https://docs.python.org/3.13/library/typing.html#typing.Generator)
 /// - [typing.AsyncGenerator](https://docs.python.org/3.13/library/typing.html#typing.AsyncGenerator)
 #[violation]
@@ -140,9 +141,20 @@ impl DefaultedTypeAnnotation {
     /// includes default type arguments.
     fn from_expr(expr: &Expr, semantic: &ruff_python_semantic::SemanticModel) -> Option<Self> {
         let qualified_name = semantic.resolve_qualified_name(expr)?;
-        if semantic.match_typing_qualified_name(&qualified_name, "Generator") {
+
+        if semantic.match_typing_qualified_name(&qualified_name, "Generator")
+            || matches!(
+                qualified_name.segments(),
+                ["collections", "abc", "Generator"]
+            )
+        {
             Some(Self::Generator)
-        } else if semantic.match_typing_qualified_name(&qualified_name, "AsyncGenerator") {
+        } else if semantic.match_typing_qualified_name(&qualified_name, "AsyncGenerator")
+            || matches!(
+                qualified_name.segments(),
+                ["collections", "abc", "AsyncGenerator"]
+            )
+        {
             Some(Self::AsyncGenerator)
         } else {
             None

crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP043.py.snap

@@ -10,7 +10,7 @@ UP043.py:4:15: UP043 [*] Unnecessary default type arguments
   = help: Remove default type arguments
 
 ℹ Safe fix
-1 1 | from typing import Generator, AsyncGenerator
+1 1 | from collections.abc import Generator, AsyncGenerator
 2 2 | 
 3 3 | 
 4   |-def func() -> Generator[int, None, None]:
@@ -72,4 +72,38 @@ UP043.py:31:21: UP043 [*] Unnecessary default type arguments
    31 |+async def func() -> AsyncGenerator[int]:
 32 32 |     yield 42
 33 33 | 
-34 34 |
+34 34 | 
+
+UP043.py:47:15: UP043 [*] Unnecessary default type arguments
+   |
+47 | def func() -> Generator[str, None, None]:
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^ UP043
+48 |     yield "hello"
+   |
+   = help: Remove default type arguments
+
+ℹ Safe fix
+44 44 | from typing import Generator, AsyncGenerator
+45 45 | 
+46 46 | 
+47    |-def func() -> Generator[str, None, None]:
+   47 |+def func() -> Generator[str]:
+48 48 |     yield "hello"
+49 49 | 
+50 50 | 
+
+UP043.py:51:21: UP043 [*] Unnecessary default type arguments
+   |
+51 | async def func() -> AsyncGenerator[str, None]:
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^ UP043
+52 |     yield "hello"
+   |
+   = help: Remove default type arguments
+
+ℹ Safe fix
+48 48 |     yield "hello"
+49 49 | 
+50 50 | 
+51    |-async def func() -> AsyncGenerator[str, None]:
+   51 |+async def func() -> AsyncGenerator[str]:
+52 52 |     yield "hello"