Build top-level variables and property accessors lazily.

pkg/analyzer/test/src/summary/resynthesize_test.dart

 // Copyright (c) 2015, 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 test.src.serialization.elements_test;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
@@ skipping 242 matching lines @@
     compareTypes(r.type, o.type, desc);
     expect(r.hasBeenInferred, o.hasBeenInferred, reason: desc);
   }
 
   void compareCompilationUnitElements(CompilationUnitElementImpl resynthesized,
       CompilationUnitElementImpl original) {
     String desc = 'Compilation unit ${original.source.uri}';
     compareUriReferencedElements(resynthesized, original, desc);
     expect(resynthesized.source, original.source);
     expect(resynthesized.librarySource, original.librarySource);
-    expect(resynthesized.types.length, original.types.length);
+    expect(resynthesized.types.length, original.types.length, reason: 'types');

[Paul Berry, 2016/05/19 11:27:30]

Please include `$desc` in the reason (e.g. `reason: '$desc types'`).  It makes
debugging failures so much easier.

[scheglov, 2016/05/19 16:54:57]

Done.

     for (int i = 0; i < resynthesized.types.length; i++) {
       compareClassElements(
           resynthesized.types[i], original.types[i], original.types[i].name);
     }
     expect(resynthesized.topLevelVariables.length,
-        original.topLevelVariables.length);
+        original.topLevelVariables.length,
+        reason: 'topLevelVariables');
     for (int i = 0; i < resynthesized.topLevelVariables.length; i++) {
       String name = resynthesized.topLevelVariables[i].name;
       compareTopLevelVariableElements(
           resynthesized.topLevelVariables[i],
           original.topLevelVariables
               .singleWhere((TopLevelVariableElement e) => e.name == name),
           'variable $name');
     }
-    expect(resynthesized.functions.length, original.functions.length);
+    expect(resynthesized.functions.length, original.functions.length,
+        reason: 'functions');
     for (int i = 0; i < resynthesized.functions.length; i++) {
       compareFunctionElements(resynthesized.functions[i], original.functions[i],
           'function ${original.functions[i].name}');
     }
     expect(resynthesized.functionTypeAliases.length,
-        original.functionTypeAliases.length);
+        original.functionTypeAliases.length,
+        reason: 'functionTypeAliases');
     for (int i = 0; i < resynthesized.functionTypeAliases.length; i++) {
       compareFunctionTypeAliasElements(
           resynthesized.functionTypeAliases[i],
           original.functionTypeAliases[i],
           original.functionTypeAliases[i].name);
     }
-    expect(resynthesized.enums.length, original.enums.length);
+    expect(resynthesized.enums.length, original.enums.length, reason: 'enums');
     for (int i = 0; i < resynthesized.enums.length; i++) {
       compareClassElements(
           resynthesized.enums[i], original.enums[i], original.enums[i].name);
     }
-    expect(resynthesized.accessors.length, original.accessors.length);
+    expect(resynthesized.accessors.length, original.accessors.length,
+        reason: 'accessors');
     for (int i = 0; i < resynthesized.accessors.length; i++) {
       String name = resynthesized.accessors[i].name;
       if (original.accessors[i].isGetter) {
         comparePropertyAccessorElements(
             resynthesized.accessors[i],
             original.accessors
                 .singleWhere((PropertyAccessorElement e) => e.name == name),
             'getter $name');
       } else {
         comparePropertyAccessorElements(
@@ skipping 4215 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }