TST: Coding Error in test_disallowed_nodes

[WillAyd]

See permalink below. I believe the engine parameter should be referencing the _engines global and not _parsers

pandas/pandas/tests/computation/test_eval.py

Line 1803 in 7a0ee19

@pytest.mark.parametrize('engine', _parsers)

[gfyoung]

That would seem logical to do.