fix lambda test 🛠

basnijholt · web-flow · commit 3a37f4bc0fb3 · 2019-11-19T19:44:09.000+01:00
diff --git a/adaptive/runner.py b/adaptive/runner.py
@@ -495,7 +495,7 @@ def __init__(
             def goal(_):
                 return False
 
-        if executor is None:
+        if executor is None and not inspect.iscoroutinefunction(learner.function):
             try:
                 pickle.dumps(learner.function)
             except pickle.PicklingError:
