foo1.cs

      IDeclaredElement declaredElement;
      PsiLanguageType language;
      Func<RenameIdentifierMarker, IDeclaredElementPointer<IDeclaredElement>> elementPointerFactory;
      Func<string> newNameGetter;
      IDeclaration declaration;
      var nameRange = GetNameRangeByChange(change, out declaredElement, out declaration, out language,
        out elementPointerFactory, out newNameGetter);

///////////////////////////////////////////////////////////////////////////////////////////////////////

    private DocumentRange GetNameRangeByChange(DocumentChange change, out IDeclaredElement declaredElement,
      out IDeclaration declaration, out PsiLanguageType language,
      out Func<RenameIdentifierMarker, IDeclaredElementPointer<IDeclaredElement>> elementPointerFactory,
      out Func<string> newNameGetter)
    {
      // ...

foo2.cs

      var nameRange = GetNameRangeByChange(change, out var declaredElement, out var declaration, out var language,
        out var elementPointerFactory, out var newNameGetter);

///////////////////////////////////////////////////////////////////////////////////////////////////////

    private DocumentRange GetNameRangeByChange(DocumentChange change, out IDeclaredElement declaredElement,
      out IDeclaration declaration, out PsiLanguageType language,
      out Func<RenameIdentifierMarker, IDeclaredElementPointer<IDeclaredElement>> elementPointerFactory,
      out Func<string> newNameGetter)
    {
      // ...

foo3.cs

      var (nameRange, declaredElement, declaration, language, elementPointerFactory, newNameGetter) = GetNameRangeByChange(change);

///////////////////////////////////////////////////////////////////////////////////////////////////////

    private (DocumentRange nameRange, IDeclaredElement declaredElement, IDeclaration declaration, PsiLanguageType language,
             Func<RenameIdentifierMarker, IDeclaredElementPointer<IDeclaredElement>> elementPointerFactory,
             Func<string> newNameGetter)
      GetNameRangeByChange(DocumentChange change)
    {
      // ...