code: public static TypeAnnotationPosition
          methodParameter(final JCLambda onLambda,
                          final int parameter_index,
                          final int pos) {
          return methodParameter(emptyPath, onLambda,
                                 parameter_index, pos);
      }
docs: Create a {@code TypeAnnotationPosition} for a method formal parameter.
  
  @param onLambda The lambda for this parameter.
  @param parameter_index The index of the parameter.
  @param pos The position from the associated tree node.