[6.3][Concurrency] Skip Sendable checking for nonisolated(nonsending) …#87286
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xedin merged 1 commit intoswiftlang:release/6.3from Feb 19, 2026
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[6.3][Concurrency] Skip Sendable checking for nonisolated(nonsending) …#87286xedin merged 1 commit intoswiftlang:release/6.3from
Sendable checking for nonisolated(nonsending) …#87286xedin merged 1 commit intoswiftlang:release/6.3from
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…-> `@concurrent` conversions Converting a `nonisolated(nonsending)` function type to a `@concurrent` one is the same as converting it to an actor-isolated function type. `nonisolated(nonsending)` functions run on the caller's actor without crossing an isolation boundary and so no Sendable checking is necessary. Resolves: swiftlang#87235 Resolves: rdar://170380869 (cherry picked from commit 5f9efd2)
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hborla
approved these changes
Feb 19, 2026
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…->
@concurrentconversionsExplanation:
Converting a
nonisolated(nonsending)function type to a@concurrentone is the same as converting it to an actor-isolated function type.nonisolated(nonsending)functions run on the caller's actor without crossing an isolation boundary and so no Sendable checking is necessary.Resolves: @Sendable function conversions seem unnecessarily restrictive #86203, A
nonisolated(nonsending)function with non-Sendableparameter can witness@concurrentrequirement but converting it to the latter produces warning #87235, rdar://170380869Main branch PR: [Concurrency] Skip
Sendablechecking fornonisolated(nonsending)… #87270Risk: Very Low. The change removes extraneous Sendable checking for some conversion and lets them be accepted without warnings.
Reviewed By: @ktoso @hborla
Testing: Added new test-cases to the suite.
(cherry picked from commit 5f9efd2)