[async-function-with-timeout] Disable check for asyncio before Python 3.11 (ASYNC109)

crates/ruff_linter/src/rules/flake8_async/mod.rs

@@ -11,6 +11,7 @@ mod tests {
 
     use crate::assert_messages;
     use crate::registry::Rule;
+    use crate::settings::types::PythonVersion;
     use crate::settings::LinterSettings;
     use crate::test::test_path;
 
@@ -36,4 +37,18 @@ mod tests {
         assert_messages!(snapshot, diagnostics);
         Ok(())
     }
+
+    #[test_case(Path::new("ASYNC109_0.py"); "asyncio")]
+    #[test_case(Path::new("ASYNC109_1.py"); "trio")]
+    fn async109_python_310_or_older(path: &Path) -> Result<()> {
+        let diagnostics = test_path(
+            Path::new("flake8_async").join(path),
+            &LinterSettings {
+                target_version: PythonVersion::Py310,
+                ..LinterSettings::for_rule(Rule::AsyncFunctionWithTimeout)
+            },
+        )?;
+        assert_messages!(path.file_name().unwrap().to_str().unwrap(), diagnostics);
+        Ok(())
+    }
 }

crates/ruff_linter/src/rules/flake8_async/rules/async_function_with_timeout.rs

@@ -6,6 +6,7 @@ use ruff_text_size::Ranged;
 
 use crate::checkers::ast::Checker;
 use crate::rules::flake8_async::helpers::AsyncModule;
+use crate::settings::types::PythonVersion;
 
 /// ## What it does
 /// Checks for `async` functions with a `timeout` argument.
@@ -86,6 +87,11 @@ pub(crate) fn async_function_with_timeout(
         AsyncModule::AsyncIo
     };
 
+    // asyncio.timeout feature was first introduced in Python 3.11
+    if module == AsyncModule::AsyncIo && checker.settings.target_version < PythonVersion::Py311 {
+        return;
+    }
+
     checker.diagnostics.push(Diagnostic::new(
         AsyncFunctionWithTimeout { module },
         timeout.range(),

crates/ruff_linter/src/rules/flake8_async/snapshots/ruff_linter__rules__flake8_async__tests__ASYNC109_0.py.snap

@@ -0,0 +1,18 @@
+---
+source: crates/ruff_linter/src/rules/flake8_async/mod.rs
+---
+ASYNC109_0.py:8:16: ASYNC109 Async function definition with a `timeout` parameter
+  |
+8 | async def func(timeout):
+  |                ^^^^^^^ ASYNC109
+9 |     ...
+  |
+  = help: Use `trio.fail_after` instead
+
+ASYNC109_0.py:12:16: ASYNC109 Async function definition with a `timeout` parameter
+   |
+12 | async def func(timeout=10):
+   |                ^^^^^^^^^^ ASYNC109
+13 |     ...
+   |
+   = help: Use `trio.fail_after` instead

crates/ruff_linter/src/rules/flake8_async/snapshots/ruff_linter__rules__flake8_async__tests__ASYNC109_1.py.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff_linter/src/rules/flake8_async/mod.rs
+---
+