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