code: public static TypeAnnotationPosition
          constructorRefTypeArg(final List<TypePathEntry> location,
                                final int type_index) {
          return constructorRefTypeArg(location, null, type_index, -1);
      }
docs: Create a {@code TypeAnnotationPosition} for a constructor reference
  type argument.
  
  @param location The type path.
  @param type_index The index of the type argument.