Doug Gregor 436e965b66 [SE-0466] Under main actor default isolation, explicit nonisolated is not special ...

Given an explicitly-nonisolated type such as

    nonisolated struct S { }

all extensions of S were also being treated as nonisolated. This meant
that being implicitly nonisolated (i.e., when you're using nonisolated
default isolation) was different from explicitly-writing nonisolated,
which is unfortunate and confusing. Align the rules, such that an
extension of S will get default isolation:

    extension S {
      func f() { } // @MainActor if we're in main actor default isolation
    }

2025-07-25 09:46:34 -07:00

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