Github user okram commented on the issue:
https://github.com/apache/tinkerpop/pull/486
This is a good find. However, the implementation is a bit gimpy.
`Step.getRequirements()` is already a recursive process as
`TraversalParents` will check their children for requirements. I propose we go
back to the `INVALIDATING_STEPS` model and just list all the steps that
explicitly require `PATH`. That is, add the ones we were missing and keep the
new test case you added to `IncidentToAdjacentStrategyTest`.
* `PathStep`
* `TreeStep`
* `CyclicPathStep`
* `SimplePathStep`
* `EdgeOtherVertexStep`
* `TreeSideEffectStep`
...then also add `LambdaHolder`.
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