Doug Gregor 6ebb0ff560 Replace AsyncIteratorProtocol.nextElement() with isolated next(_:) ...

Use an optional isolated parameter to this new `next(_:)` overload to
keep it on the same actor as the caller, and pass `#isolation` when
desugaring the async for..in loop. This keeps async iteration loops on
the same actor, allowing non-Sendable values to be used with many
async sequences.

2024-01-25 16:04:48 -08:00

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