Pavel Yaskevich 0a75a07962 [CSSolver] Don't drop bindings with type variables while applying solutions ...

If a (partial) solution has a type variable it could only be unbound
if `FreeTypeVariableBinding` is set to `Allow`, in all other cases
solution would either have a fully resolved type or a hole.

`applySolution` shouldn't second guess `finalize()` and just apply
a solution as given. This is very important for multi-statement closures
because their elements are solved in isolation and opaque value types
inferred for their result could contain not-yet-resolved type variables
 from outer context in their substitution maps (which it totally legal
under bi-directional inference).

2022-11-10 10:12:38 -08:00

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