[6.2] [SE-0466 experimental amendment] Don't infer @mainactor on types conforming to Sendable #82590
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
When the default isolation is main-actor, don't infer @mainactor for a type that conforms to a protocol P in its primary definition when P inherits from Sendable. Such types should remain non-isolated because they're highly unlikely to be able to implement the P conformance (which cannot be isolated). Put this feature behind a new experimental flag, SendableProhibitsMainActorInference. Implements rdar://151029300
nkcsgexi
approved these changes
Jun 27, 2025
bnbarham
approved these changes
Jun 27, 2025
|
@swift-ci please test |
|
@swift-ci please test |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
@MainActorfor a type that conforms to a protocolPin its primary definition whenPinherits fromSendableMetatype. Such types should remain non-isolatedbecause they're highly unlikely to be able to implement the
Pconformance (which cannot be isolated). This feature is under an active pitch, so for now it is behind the experimental flagSendableProhibitsMainActorInference.