anchor.diff:  /// ```dart
   /// @Component(
   ///   selector: 'my-app',
  -///   directives: const [FORM_DIRECTIVES]
  +///   directives: const [formDirectives]
   /// )
   /// class MyApp {}
   /// ```
  -const List<Type> FORM_DIRECTIVES = const [
  +const List<Type> formDirectives = const [
     NgControlName,
     NgControlGroup,
     NgFormControl,
  
positive.code:   PatternValidator
  ];
  
  const List<Type> formDirectives = FORM_DIRECTIVES;
  
negative.code:         MaxLengthValidator,
          PatternValidator;
  
  /// A list of all the form directives used as part of a `@Component` annotation.
  ///
  ///  This is a shorthand for importing them each individually.
  