Pavel Yaskevich f422085b70 [Concurrency] SE-0463: Sendable inference on sync and async variants of imported APIs should match ...

This is a follow-up to https://github.com/swiftlang/swift/pull/82085
which made it so async variant doesn't get `@Sendable` inferred because
the proposal specified that inference should happen only on completion
handler parameter type of a synchronous variant of an imported API.

This runs into implementation issues related to thunking in some
cases were async convention expects the type of a completion handler
to match exactly for both variants of the imported API.

Resolves: rdar://154695053
(cherry picked from commit 30f0fa8d75)

2025-07-01 00:16:36 -07:00

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