Fix unused debug in chess.engine.run_in_background()

chess/engine.py

@@ -46,7 +46,7 @@
 EventLoopPolicy = asyncio.DefaultEventLoopPolicy
 
 
-def run_in_background(coroutine: Callable[[concurrent.futures.Future[T]], Coroutine[Any, Any, None]], *, name: Optional[str] = None, debug: bool = False) -> T:
+def run_in_background(coroutine: Callable[[concurrent.futures.Future[T]], Coroutine[Any, Any, None]], *, name: Optional[str] = None, debug: Optional[bool] = None) -> T:
     """
     Runs ``coroutine(future)`` in a new event loop on a background thread.
 
@@ -60,7 +60,7 @@ def run_in_background(coroutine: Callable[[concurrent.futures.Future[T]], Corout
 
     def background() -> None:
         try:
-            asyncio.run(coroutine(future))
+            asyncio.run(coroutine(future), debug=debug)
             future.cancel()
         except Exception as exc:
             future.set_exception(exc)
@@ -2894,7 +2894,7 @@ def _shutdown() -> None:
                 self.protocol.loop.call_soon_threadsafe(_shutdown)
 
     @classmethod
-    def popen(cls, Protocol: Type[Protocol], command: Union[str, List[str]], *, timeout: Optional[float] = 10.0, debug: bool = False, setpgrp: bool = False, **popen_args: Any) -> SimpleEngine:
+    def popen(cls, Protocol: Type[Protocol], command: Union[str, List[str]], *, timeout: Optional[float] = 10.0, debug: Optional[bool] = None, setpgrp: bool = False, **popen_args: Any) -> SimpleEngine:
         async def background(future: concurrent.futures.Future[SimpleEngine]) -> None:
             transport, protocol = await Protocol.popen(command, setpgrp=setpgrp, **popen_args)
             threading.current_thread().name = f"{cls.__name__} (pid={transport.get_pid()})"
@@ -2911,15 +2911,15 @@ async def background(future: concurrent.futures.Future[SimpleEngine]) -> None:
         return run_in_background(background, name=f"{cls.__name__} (command={command!r})", debug=debug)
 
     @classmethod
-    def popen_uci(cls, command: Union[str, List[str]], *, timeout: Optional[float] = 10.0, debug: bool = False, setpgrp: bool = False, **popen_args: Any) -> SimpleEngine:
+    def popen_uci(cls, command: Union[str, List[str]], *, timeout: Optional[float] = 10.0, debug: Optional[bool] = None, setpgrp: bool = False, **popen_args: Any) -> SimpleEngine:
         """
         Spawns and initializes a UCI engine.
         Returns a :class:`~chess.engine.SimpleEngine` instance.
         """
         return cls.popen(UciProtocol, command, timeout=timeout, debug=debug, setpgrp=setpgrp, **popen_args)
 
     @classmethod
-    def popen_xboard(cls, command: Union[str, List[str]], *, timeout: Optional[float] = 10.0, debug: bool = False, setpgrp: bool = False, **popen_args: Any) -> SimpleEngine:
+    def popen_xboard(cls, command: Union[str, List[str]], *, timeout: Optional[float] = 10.0, debug: Optional[bool] = None, setpgrp: bool = False, **popen_args: Any) -> SimpleEngine:
         """
         Spawns and initializes an XBoard engine.
         Returns a :class:`~chess.engine.SimpleEngine` instance.