Support deserialized compilation of the empty program.

pkg/compiler/lib/src/serialization/equivalence.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.
 
 /// Functions for asserting equivalence across serialization.
 
 library dart2js.serialization.equivalence;
 
 import '../common/resolution.dart';
 import '../constants/expressions.dart';
@@ skipping 739 matching lines @@
 }
 
 /// Tests the equivalence of [resolvedAst1] and [resolvedAst2] using [strategy].
 bool testResolvedAstEquivalence(
     ResolvedAst resolvedAst1, ResolvedAst resolvedAst2,
     [TestStrategy strategy = const TestStrategy()]) {
   return strategy.testElements(resolvedAst1, resolvedAst2, 'element',
           resolvedAst1.element, resolvedAst2.element) &&
       new NodeEquivalenceVisitor(strategy).testNodes(resolvedAst1, resolvedAst2,
           'node', resolvedAst1.node, resolvedAst2.node) &&
+      new NodeEquivalenceVisitor(strategy).testNodes(resolvedAst1, resolvedAst2,
+          'body', resolvedAst1.body, resolvedAst2.body) &&
       testTreeElementsEquivalence(resolvedAst1, resolvedAst2, strategy);
 }
 
 /// Tests the equivalence of the data stored in the [TreeElements] of
 /// [resolvedAst1] and [resolvedAst2] using [strategy].
 bool testTreeElementsEquivalence(
     ResolvedAst resolvedAst1, ResolvedAst resolvedAst2,
     [TestStrategy strategy = const TestStrategy()]) {
   AstIndexComputer indices1 = new AstIndexComputer();
   resolvedAst1.node.accept(indices1);
@@ skipping 917 matching lines @@
   @override
   bool visitStatement(Statement node1, Statement node2) {
     throw new UnsupportedError('Unexpected nodes: $node1 <> $node2');
   }
 
   @override
   bool visitStringNode(StringNode node1, StringNode node2) {
     throw new UnsupportedError('Unexpected nodes: $node1 <> $node2');
   }
 }