add PosArgT typing to run()

Author: jakkdl

src/trio/_core/_run.py

@@ -2184,8 +2184,8 @@ def setup_runner(
 
 
 def run(
-    async_fn: Callable[..., Awaitable[RetT]],
-    *args: object,
+    async_fn: Callable[[Unpack[PosArgT]], Awaitable[RetT]],
+    *args: Unpack[PosArgT],
     clock: Clock | None = None,
     instruments: Sequence[Instrument] = (),
     restrict_keyboard_interrupt_to_checkpoints: bool = False,

src/trio/_core/_tests/test_run.py

@@ -76,7 +76,7 @@ async def trivial(x: T) -> T:
 
     with pytest.raises(TypeError):
         # Missing an argument
-        _core.run(trivial)
+        _core.run(trivial)  # type: ignore[arg-type]
 
     with pytest.raises(TypeError):
         # Not an async function