[ConstraintSystem] NFC: Unify type variable and disjunction choice re… #19117
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…presentation
Introduce
TypeBinding
interface with a singleattempt
methodwhich is useful to encapsulate specific binding logic used for
attempting disjunction choices and type variable bindings under
a single interface. This makes it easier to unify top-level logic
responsible for binding enumeration.
It should also make it possible to introduce unified binding producer
interface in the future.