Merge pull request #70885 from xedin/rephrase-preconcurrency-import-diagnostic

[Sema] NFC: Re-phrase `@preconcurrency import` warning from "is unuse…

Author: xedin

include/swift/AST/DiagnosticsSema.def

@@ -2605,7 +2605,7 @@ WARNING(add_predates_concurrency_import,none,
      "'Sendable'-related %select{warnings|errors}0 from module %1"
      "%select{| as warnings}0", (bool, Identifier))
 WARNING(remove_predates_concurrency_import,none,
-     "'@preconcurrency' attribute on module %0 is unused", (Identifier))
+     "'@preconcurrency' attribute on module %0 has no effect", (Identifier))
 WARNING(remove_public_import,none,
         "public import of %0 was not used in public declarations or inlinable code",
         (const ModuleDecl *))

test/Concurrency/predates_concurrency_import.swift

@@ -14,7 +14,7 @@
 @preconcurrency import NonStrictModule
 @_predatesConcurrency import StrictModule // expected-warning{{'@_predatesConcurrency' has been renamed to '@preconcurrency'}}
 @preconcurrency import OtherActors
-// expected-warning@-1{{'@preconcurrency' attribute on module 'OtherActors' is unused}}{{1-17=}}
+// expected-warning@-1{{'@preconcurrency' attribute on module 'OtherActors' has no effect}}{{1-17=}}
 
 func acceptSendable<T: Sendable>(_: T) { }