Issue 25558. Report an error, but don't crash when AST it too deep.

pkg/analyzer/lib/error/error.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.
 
 library analyzer.error.error;
 
 import 'dart:collection';
 
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart' show ScannerErrorCode;
@@ skipping 419 matching lines @@
   ParserErrorCode.NORMAL_BEFORE_OPTIONAL_PARAMETERS,
   ParserErrorCode.NULLABLE_TYPE_IN_EXTENDS,
   ParserErrorCode.NULLABLE_TYPE_IN_IMPLEMENTS,
   ParserErrorCode.NULLABLE_TYPE_IN_WITH,
   ParserErrorCode.NULLABLE_TYPE_PARAMETER,
   ParserErrorCode.POSITIONAL_AFTER_NAMED_ARGUMENT,
   ParserErrorCode.POSITIONAL_PARAMETER_OUTSIDE_GROUP,
   ParserErrorCode.REDIRECTING_CONSTRUCTOR_WITH_BODY,
   ParserErrorCode.REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR,
   ParserErrorCode.SETTER_IN_FUNCTION,
+  ParserErrorCode.STACK_OVERFLOW,
   ParserErrorCode.STATIC_AFTER_CONST,
   ParserErrorCode.STATIC_AFTER_FINAL,
   ParserErrorCode.STATIC_AFTER_VAR,
   ParserErrorCode.STATIC_CONSTRUCTOR,
   ParserErrorCode.STATIC_GETTER_WITHOUT_BODY,
   ParserErrorCode.STATIC_OPERATOR,
   ParserErrorCode.STATIC_SETTER_WITHOUT_BODY,
   ParserErrorCode.STATIC_TOP_LEVEL_DECLARATION,
   ParserErrorCode.SWITCH_HAS_CASE_AFTER_DEFAULT_CASE,
   ParserErrorCode.SWITCH_HAS_MULTIPLE_DEFAULT_CASES,
@@ skipping 390 matching lines @@
    * a single list of errors.
    */
   static List<AnalysisError> mergeLists(List<List<AnalysisError>> errorLists) {
     Set<AnalysisError> errors = new HashSet<AnalysisError>();
     for (List<AnalysisError> errorList in errorLists) {
       errors.addAll(errorList);
     }
     return errors.toList();
   }
 }