CrossHairInternal: Not in a statespace context error on tests with Pytest fixtures

[Zac-HD]

from unittest.mock import Mock
import pytest
from hypothesis import settings, given, strategies as st

@pytest.fixture(scope="module")  # or any other scope
def mock_fixture():
    return Mock()

@settings(backend="crosshair")
@given(xs=st.integers())
def test(mock_fixture, xs):
    assert xs != 123456789

mock_fixture is of course completely pointless, but with the crosshair backend causes the following error:

Traceback (most recent call last):
  ...
  File ".../repro.py", line 15, in test
    @given(xs=integers())
  File "hypothesis/core.py", line 1829, in wrapped_test
    raise the_error_hypothesis_found
  File "crosshair/libimpl/builtinslib.py", line 1238, in __hash__
    return self.__index__().__hash__()
  File "crosshair/libimpl/builtinslib.py", line 1260, in __index__
    space = context_statespace()
  File "crosshair/statespace.py", line 269, in context_statespace
    raise CrossHairInternal("Not in a statespace context")
crosshair.util.CrossHairInternal: Not in a statespace context

I haven't bisected, but this error is new from somewhere in the crosshair-tool .74 -> .82 and/or hypothesis-crosshair .16 -> .19 upgrade range.

links: HypothesisWorks/hypothesis#4190, which is an update to HypothesisWorks/hypothesis#4034