[5.8] Sema: Lift restriction requiring decls with @_backDeploy to have explicit availability
#62895
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…explicit availability. Resolves rdar://103880356
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@swift-ci please test |
tshortli
changed the title
@_backDeploy to have explicit availability
nkcsgexi
approved these changes
Jan 6, 2023
AnthonyLatsis
added
🍒 release cherry pick
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Cherry pick of #62876
Swift Evolution has concluded that it is inappropriate to require decls with
@_backDeployto also have explicit availability. Lift the restriction and assume declarations with no explicit availability are back deployed as far as possible.Lifting a simultaneous attribute restriction sounds like it should be an easy task, but that was not the case here. The diagnostics for availability conflicts with the back deployment
before:version were greatly simplified by the assumption that an explicit@availableattribute would be present. With the removal of the restriction the implementation of the diagnostics had to be enhanced to look for both inherited availability and unavailability.Additionally, this PR fixes a bug that would have caused the wrong
@_backDeployattribute to be used when attributes for bothiOSandmacCatalystare present.Resolves rdar://103880356