____ test_solver_with_dependency_and_prerelease_sub_dependencies_increasing_constraints _____
Traceback (most recent call last):
  File "/home/ckuehl/proj/poetry/src/poetry/puzzle/solver.py", line 155, in _solve
    result = resolve_version(self._package, self._provider)
  File "/home/ckuehl/proj/poetry/src/poetry/mixology/__init__.py", line 18, in resolve_version
    return solver.solve()
  File "/home/ckuehl/proj/poetry/src/poetry/mixology/version_solver.py", line 111, in solve
    self._propagate(next)
  File "/home/ckuehl/proj/poetry/src/poetry/mixology/version_solver.py", line 150, in _propagate
    root_cause = self._resolve_conflict(incompatibility)
  File "/home/ckuehl/proj/poetry/src/poetry/mixology/version_solver.py", line 351, in _resolve_conflict
    raise SolveFailure(incompatibility)
poetry.mixology.failure.SolveFailure: Because no versions of a match !=1.0
 and a (1.0) depends on B (>0.9.0), every version of a requires B (>0.9.0).
So, because no versions of b match >0.9.0
 and root depends on A (*), version solving failed.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ckuehl/proj/poetry/tests/puzzle/test_solver.py", line 1222, in test_solver_with_dependency_and_prerelease_sub_dependencies_increasing_constraints
    transaction = solver.solve()
  File "/home/ckuehl/proj/poetry/src/poetry/puzzle/solver.py", line 72, in solve
    packages, depths = self._solve()
  File "/home/ckuehl/proj/poetry/src/poetry/puzzle/solver.py", line 161, in _solve
    raise SolverProblemError(e)
poetry.puzzle.exceptions.SolverProblemError: Because no versions of a match !=1.0
 and a (1.0) depends on B (>0.9.0), every version of a requires B (>0.9.0).
So, because no versions of b match >0.9.0
 and root depends on A (*), version solving failed.