Pavel Yaskevich 2619e2d8ac [ConstraintSystem] Track adjacent type variables while inferring bindings ...

Replaces `InvolvesTypeVariables` flag with a set of adjacent type
variables found during binding inference.

This approach is more suitable for incremental binding computation
because it allows to maintain a list of type variables that affect
ranking and check whether something has been resolved without having
to re-evaluate constraints associated with the given type variable.

2020-12-08 13:22:30 -08:00

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