BodyDecl intertype_member_declaration =
  intertype_parent_declaration
  ;

BodyDecl intertype_parent_declaration =
    name.target IMPLEMENTS name.interfacetype SEMICOLON
    //{: return new IntertypeImplements(target, interfacetype); :}
    {: return new DeclareParentsImplements(target, new List().add(interfacetype)); :}
  ;