Remove event loop's support for child watchers for 3.14+

.github/workflows/ci.yml

@@ -64,11 +64,13 @@ jobs:
           # M1 runners
           "macos-14"
         ]
-        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev", "3.14-dev" ]
         include:
           - experimental: false
           - python-version: "3.13-dev"
             experimental: true
+          - python-version: "3.14-dev"
+            experimental: true
 
         exclude:
           # actions/setup-python doesn't provide Python3.8 or 3.9 for M1.

src/rubicon/objc/eventloop.py

@@ -1,10 +1,10 @@
 """PEP 3156 event loop based on CoreFoundation."""
 
 import contextvars
+import sys
 import threading
 from asyncio import (
     DefaultEventLoopPolicy,
-    SafeChildWatcher,
     coroutines,
     events,
     tasks,
@@ -16,6 +16,9 @@
 from .runtime import load_library, objc_id
 from .types import CFIndex
 
+if sys.version_info < (3, 14):
+    from asyncio import SafeChildWatcher
+
 __all__ = [
     "EventLoopPolicy",
     "CocoaLifecycle",
@@ -702,23 +705,25 @@ def _init_watcher(self):
                 if threading.current_thread() == threading.main_thread():
                     self._watcher.attach_loop(self._default_loop)
 
-    def get_child_watcher(self):
-        """Get the watcher for child processes.
+    if sys.version_info < (3, 14):
 
-        If not yet set, a :class:`~asyncio.SafeChildWatcher` object is
-        automatically created.
-        """
-        if self._watcher is None:
-            self._init_watcher()
+        def get_child_watcher(self):
+            """Get the watcher for child processes.
+
+            If not yet set, a :class:`~asyncio.SafeChildWatcher` object is
+            automatically created.
+            """
+            if self._watcher is None:
+                self._init_watcher()
 
-        return self._watcher
+            return self._watcher
 
-    def set_child_watcher(self, watcher):
-        """Set the watcher for child processes."""
-        if self._watcher is not None:
-            self._watcher.close()
+        def set_child_watcher(self, watcher):
+            """Set the watcher for child processes."""
+            if self._watcher is not None:
+                self._watcher.close()
 
-        self._watcher = watcher
+            self._watcher = watcher
 
 
 class CFLifecycle: