Reset serialized expression to empty on StateError.

pkg/analyzer/lib/src/summary/summarize_const_expr.dart

 // Copyright (c) 2016, 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 serialization.summarize_const_expr;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/type.dart' show DartType;
 import 'package:analyzer/src/summary/format.dart';
@@ skipping 109 matching lines @@
   void serialize(Expression expr) {
     try {
       if (expr is NamedExpression) {
         NamedExpression namedExpression = expr;
         name = namedExpression.name.label.name;
         expr = namedExpression.expression;
       }
       _serialize(expr);
     } on StateError {
       isValidConst = false;
+      operations.clear();
+      assignmentOperators.clear();
+      ints.clear();
+      doubles.clear();
+      strings.clear();
+      references.clear();
     }
   }
 
   /**
    * Serialize the given [annotation] into this serializer state.
    */
   void serializeAnnotation(Annotation annotation);
 
   /**
    * Return [EntityRefBuilder] that corresponds to the constructor having name
@@ skipping 524 matching lines @@
     if (typeArguments == null) {
       ints.add(0);
     } else {
       ints.add(typeArguments.arguments.length);
       for (TypeAnnotation type in typeArguments.arguments) {
         references.add(serializeTypeName(type));
       }
     }
   }
 }