Change @_nonSendable to unavailable extensions #892
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@swift-ci please test |
parkera
approved these changes
Sep 3, 2024
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@_nonSendablewas designed as a detail for the compiler to use and was not intended to be written directly in source. As such, the compiler treats it slightly differently and has allowed us to commit some incorrect annotations, such as:(a both non-sendable and unchecked-sendable class)
and
(a non-sendable struct that conforms to a
Sendableprotocol)This PR replaces usages of
@_nonSendablewith the officially supported design (unavailable extensions). This has the drawbacks of needing to duplicate the type's availability and moving the non-sendable annotation away from the type itself, but it means that both of the errors above would be diagnosed as actual compilation errors rather than silently being accepted and potentially causing issues for clients.