Store the result of type inference in summaries.

pkg/analyzer/test/src/summary/summarize_elements_strong_test.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 analyzer.test.src.summary.summarize_elements_strong_test;
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 import 'summarize_elements_test.dart';
 import 'summary_common.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(SummarizeElementsStrongTest);
 }
 
 /**
  * Override of [SummaryTest] which creates summaries from the element model
  * using strong mode.
  */
 @reflectiveTest
 class SummarizeElementsStrongTest extends SummarizeElementsTest {
   @override
   AnalysisOptionsImpl get options => super.options..strongMode = true;
+
+  @override
+  bool get strongMode => true;
 }