anchor.diff:  /// All @Observe annotated methods.
   Map<String, DeclarationMirror> _observeMethodsFor(Type type) {
     return declarationsFor(type, jsProxyReflectable, where: (name, declaration) {
  -    if (!isRegularMethod(declaration)) return false;
  +    if (!_isRegularMethod(declaration)) return false;
       return declaration.metadata.any((d) => d is Observe);
     });
   }
  
positive.code: /// All @Listen annotated methods.
  Map<String, DeclarationMirror> _listenMethodsFor(Type type) {
    return declarationsFor(type, jsProxyReflectable, where: (name, declaration) {
      if (!isRegularMethod(declaration)) return false;
      return declaration.metadata.any((d) => d is Listen);
    });
  }
  
negative.code: /// [Property].
  Map<String, DeclarationMirror> propertyDeclarationsFor(Type type) {
    return declarationsFor(type, jsProxyReflectable, where: (name, declaration) {
      if (_isRegularMethod(declaration) || _isSetter(declaration)) return false;
      return declaration.metadata.any((d) => d is Property);
    });
  }
  