Prefer allOverriddenSymbols.hasNext

Author: som-snytt

compiler/src/dotty/tools/dotc/transform/CheckUnused.scala

@@ -926,7 +926,7 @@ object CheckUnused:
       sym.is(Private, butNot = ParamAccessor)
       || sym.owner.isAnonymousClass && !sym.isEffectivelyOverride
     def isEffectivelyOverride: Boolean =
-      sym.is(Override) || sym.nextOverriddenSymbol.exists
+      sym.is(Override) || sym.allOverriddenSymbols.hasNext
     // pick the symbol the user wrote for purposes of tracking
     inline def userSymbol: Symbol=
       if sym.denot.is(ModuleClass) then sym.denot.companionModule else sym