Overlap of free variables and other types should not be empty
Description
Problem
Intersections containing type variables and values like
are being simplified to
We cannot predict what a type variable overlaps with (well, technically we could use its type bounds, but let's be more conservative for now), so this intersection should be left unchanged.
Solution
Overlap is the culprit. Ensure there is always an overlap between type variables and other types.
Environment
None
