ignore exceptions during shutdown

pkg/analyzer/lib/src/generated/ast.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.ast;
 
 import 'dart:collection';
@@ skipping 7824 matching lines @@
 }
 
 /**
  * The abstract class `FormalParameter` defines the behavior of objects representing a
  * parameter to a function.
  *
  * <pre>
  * formalParameter ::=
  *     [NormalFormalParameter]
  *   | [DefaultFormalParameter]
- *   | [DefaultFormalParameter]
  * </pre>
  */
 abstract class FormalParameter extends AstNode {
   /**
    * Return the element representing this parameter, or `null` if this parameter has not been
    * resolved.
    *
    * @return the element representing this parameter
    */
   ParameterElement get element {
@@ skipping 12405 matching lines @@
     _elements[index] = node;
   }
   void clear() {
     _elements = <E> [];
   }
   int get length => _elements.length;
   void set length(int value) {
     throw new UnsupportedError("Cannot resize NodeList.");
   }
 }