default TypeParameterDeclaration asTypeParameter(){
  throw new UnsupportedOperationException(String.format("%s is not a type parameter",this));
}

default TypeParameterDeclaration asTypeParameter ( ) { throw new UnsupportedOperationException ( String . format ( "%s is not a type parameter" , this ) ) ; }
return this as a typeparameterdeclaration or throw unsupportedoperationexception .
