Remove unused variable

Author: basnijholt

adaptive/runner.py

@@ -14,7 +14,7 @@
 import warnings
 from contextlib import suppress
 from datetime import datetime, timedelta
-from typing import Any, Callable, Union
+from typing import Any, Callable
 
 import loky
 
@@ -27,12 +27,6 @@
 )
 from adaptive.notebook_integration import in_ipynb, live_info, live_plot
 
-try:
-    from typing import TypeAlias
-except ImportError:
-    # Python <3.10
-    from typing_extensions import TypeAlias
-
 try:
     import ipyparallel
 
@@ -72,10 +66,6 @@
     # and https://github.com/python-adaptive/adaptive/issues/301
     _default_executor = loky.get_reusable_executor
 
-_GoalTypes: TypeAlias = Union[
-    Callable[[BaseLearner], bool], int, float, datetime, timedelta, None
-]
-
 
 class BaseRunner(metaclass=abc.ABCMeta):
     r"""Base class for runners that use `concurrent.futures.Executors`.