As user notes that checking the box for "This position class constrains the syntactic behavior of its output:" on an adjective position class if there are no possible inputs given leads to purple page of pathos. Screenshot illustrating the scenario that elicits the behavior:
As user notes that checking the box for "This position class constrains the syntactic behavior of its output:" on an adjective position class if there are no possible inputs given leads to purple page of pathos. Screenshot illustrating the scenario that elicits the behavior: