mypy fixes

tractor/_actor.py

@@ -357,10 +357,10 @@ class Actor:
                     # (i.e. no cid was provided in the msg - see above).
                     # Push this error to all local channel consumers
                     # (normally portals) by marking the channel as errored
-                    tb_str = msg.pop('tb_str')
+                    tb_str = msg.get('tb_str')
                     assert chan.uid
                     exc = InternalActorError(
-                        f"{self.channel.uid}\n" + tb_str,
+                        f"{chan.uid}\n" + tb_str,
                         **msg,
                     )
                     chan._exc = exc

tractor/_portal.py

@@ -60,7 +60,7 @@ class Portal:
         # when this is set to a tuple returned from ``_submit()`` then
         # it is expected that ``result()`` will be awaited at some point
         # during the portal's lifetime
-        self._result = None
+        self._result: Optional[Any] = None
         # set when _submit_for_result is called
         self._expect_result: Optional[
             Tuple[str, Any, str, Dict[str, Any]]

tractor/_trionics.py

@@ -222,7 +222,7 @@ class ActorNursery:
 
         log.debug(f"Waiting on all subactors to complete")
         children = self._children.copy()
-        errors = []
+        errors: List[Exception] = []
         # wait on run_in_actor() tasks, unblocks when all complete
         async with trio.open_nursery() as nursery:
             for subactor, proc, portal in children.values():