RSRP-469306: Replace Anonymous Type: class name with dots considered valid.

JetBrains ReSharper Ultimate 182.0.20180416.132916-eap00d.

    internal class Book
    {
        public string Author { get; set; }
        public string Title { get; set; }
    }

    public class ConvertAnonymousToNamedType
    {
        private string Test(List<Book> books)
        {
            var bookList = from book in books
                select new { book.Author, book.Title };

            var bookNew = bookList.ToList().FirstOrDefault(book => book.Author == "King");
            return bookNew?.Author;
        }
    }

1. Invoke Refactor This -> Replace Anonymous Type With Named Class on new in new { book.Author, book.Title }.
2. Set "T.T" as Name.

Actual result:
No error message. Name considered valid.

Expected result:
"Identifier is not valid" error message is shown.

NOTE:
If proceed with name "T.T" then class "T" is created.