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+import asyncio

+

+from adaptive import Runner, SequenceLearner

+from adaptive.runner import SequentialExecutor

+

+

+class FailOnce:

+    def __init__(self):

+        self.failed = False

+

+    def __call__(self, value):

+        if self.failed:

+            return value

+        self.failed = True

+        raise RuntimeError

+

+

+def test_fail_with_sequence_of_unhashable():

+    # https://github.com/python-adaptive/adaptive/issues/265

+    seq = [{1: 1}]  # unhashable

+    learner = SequenceLearner(FailOnce(), sequence=seq)

+    runner = Runner(

+        learner, goal=SequenceLearner.done, retries=1, executor=SequentialExecutor()

+    )

+    asyncio.get_event_loop().run_until_complete(runner.task)

+    assert runner.status() == "finished"