anchor.diff:   *
    * Clients may not extend, implement or mix-in this class.
    */
  -abstract class FunctionTypedElement
  -    implements TypeDefiningElement, TypeParameterizedElement {
  +abstract class FunctionTypedElement implements TypeParameterizedElement {
     /**
      * Return a list containing all of the parameters defined by this executable
      * element.
  
positive.code:  *
   * Clients may not extend, implement or mix-in this class.
   */
  abstract class FunctionTypeAliasElement implements FunctionTypedElement {
    /**
     * An empty array of type alias elements.
     */
  
negative.code:    */
    @deprecated
    SourceRange get docRange;
  
    /**
     * Return the content of the documentation comment (including delimiters) for
     * this element, or `null` if this element does not or cannot have
     * documentation.
     */
    String get documentationComment;
  
    /**
     * Return the element that either physically or logically encloses this
  