Pavel Yaskevich 4799acfb20 [CSBindings] Attempt a type variable early if it's constrained by a struct/enum type ...

If a type variable has a subtype binding which came from a conversion/subtype/equality
constraint to a struct or enum (expect to `AnyHashable`, `Unsafe{Mutable}RawPointer`),
attempt it early because that type is the only choice which is not going to fail such
constraint.

For example, in cases like `$T argument convertible to Int` type variable could
only be bound to `Int`, `Int!`, or `@lvalue Int` to satisfy that constraint, so
it would make sense to attempt to bind it to `Int` early if it doesn't represent
a result of a member lookup (that's how IUO and/or `@lvalue` could be inferred)`
and doesn't have any direct disjunction associated with it e.g. for coercion or
optional matching.

2021-11-08 13:51:23 -08:00

71 KiB

Raw Blame History

View Raw