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[6.2] [SE-0466] Enable SendableProhibitsMainActorInference by default #82923

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[6.2] [SE-0466] Enable SendableProhibitsMainActorInference by default #82923

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  • Explanation: Implements the amendment to SE-0466 currently under discussion, which prohibits @MainActor from being inferred for Sendable-conforming types in when default-main-actor-isolation is enabled.
  • Scope: Narrow. Only applies to default main actor isolation.
  • Issues: rdar://151029300
  • Original PRs: [SE-0466] Enable SendableProhibitsMainActorInference by default #82921
  • Risk: Low. Enables slightly more inference rules with default main actor isolation.
  • Testing: CI
  • Reviewers:

@DougGregor
[SE-0466] Enable SendableProhibitsMainActorInference by default
457d44c 
This implements the SE-0466 amendment under discussion for all code
with default main-actor isolation.

Finalizes rdar://151029300.
@DougGregor DougGregor requested a review from a team as a code owner July 9, 2025 18:10
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@swift-ci please test

@DougGregor DougGregor marked this pull request as draft July 9, 2025 18:32
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@swift-ci please test Windows

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