Allan Shortlidge 9e875f9839 Concurrency: Declare explicit Failure typealiases on AsyncSequence iterators. ...

Associated type inference ought to take care of providing the `Failure`
typealias for these `AsyncIteratorProtocol` types. However, the inferred
typealias is printed with `@_implements` in the `.swiftinterface`, guarded with
the `$AssociatedTypeImplements` language feature guard, which means older
compilers cannot see the typealias and therefore think the conformance is
incomplete. To make sure the `_Concurrency` module's interface is backward
compatible, we must manually define these typealiases temporarily.

Part of rdar://125138945

2024-03-27 18:09:53 -07:00

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