Anthony Latsis 934964d49d Use AbstractStorageDecl::isSettableInSwift to prohibit direct writes to optional requirements ...

Stop pretending that an optional requirement is immutable via the `StorageImplInfo` request.
This approach has lead astray the conformance checker and may have had a negative impact
on other code paths, and it doesn't work for imported declarations because they bypass the
request. Instead, use a forwarding `AbstractStorageDecl::isSettableInSwift` method
that special-cases optional requirements.

2022-04-20 14:27:15 +03:00

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