Support for AwaitExpression in unlinked expressions.

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 48 matching lines @@
  * Instances of this class keep track of intermediate state during
  * serialization of a single constant [Expression].
  */
 abstract class AbstractConstExprSerializer {
   /**
    * See [UnlinkedExprBuilder.isValidConst].
    */
   bool isValidConst = true;
 
   /**
-   * See [UnlinkedExprBuilder.nmae].
+   * See [UnlinkedExprBuilder.name].
    */
   String name = null;
 
   /**
    * See [UnlinkedExprBuilder.operations].
    */
   final List<UnlinkedExprOperation> operations = <UnlinkedExprOperation>[];
 
   /**
    * See [UnlinkedExprBuilder.assignmentOperators].
@@ skipping 293 matching lines @@
       operations.add(UnlinkedExprOperation.typeCast);
     } else if (expr is IsExpression) {
       isValidConst = false;
       _serialize(expr.expression);
       references.add(serializeTypeName(expr.type));
       operations.add(UnlinkedExprOperation.typeCheck);
     } else if (expr is ThrowExpression) {
       isValidConst = false;
       _serialize(expr.expression);
       operations.add(UnlinkedExprOperation.throwException);
+    } else if (expr is AwaitExpression) {
+      isValidConst = false;
+      _serialize(expr.expression);
+      operations.add(UnlinkedExprOperation.await);
     } else {
       throw new StateError('Unknown expression type: $expr');
     }
   }
 
   void _serializeArguments(ArgumentList argumentList) {
     List<Expression> arguments = argumentList.arguments;
     // Serialize the arguments.
     List<String> argumentNames = <String>[];
     arguments.forEach((arg) {
@@ skipping 251 matching lines @@
     if (typeArguments == null) {
       ints.add(0);
     } else {
       ints.add(typeArguments.arguments.length);
       for (TypeName typeName in typeArguments.arguments) {
         references.add(serializeTypeName(typeName));
       }
     }
   }
 }