swift

60b06a1a - [Diagnostics] Diagnose incorrect use of `subscript(dynamicMember:)` with `ReferenceWritableKeyPath`

[Diagnostics] Diagnose incorrect use of `subscript(dynamicMember:)` with `ReferenceWritableKeyPath` Add a missing fix/diagnostic for attempts to reference a member on a non-class base type via key path dynamic member lookup that has a `ReferenceWritableKeyPath`parameter. Resolves: rdar://159202867