Handle local functions in kernel_impact.

tests/compiler/dart2js/serialization/test_helper.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 dart2js.serialization_test_helper;
 
 import 'dart:collection';
 import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/constants/expressions.dart';
 import 'package:compiler/src/constants/values.dart';
@@ skipping 222 matching lines @@
 ///
 /// Uses [object1], [object2] and [property] to provide context for failures.
 bool checkSetEquivalence(var object1, var object2, String property,
     Iterable set1, Iterable set2, bool sameElement(a, b),
     {void onSameElement(a, b)}) {
   List<List> common = <List>[];
   List unfound = [];
   Set remaining = computeSetDifference(set1, set2, common, unfound,
       sameElement: sameElement, checkElements: onSameElement);
   if (unfound.isNotEmpty || remaining.isNotEmpty) {
-    String message = "Set mismatch for `$property` on $object1 vs $object2: \n"
+    String message = "Set mismatch for `$property` on\n"
+        "$object1\n vs\n$object2:\n"
         "Common:\n ${common.join('\n ')}\n"
         "Unfound:\n ${unfound.join('\n ')}\n"
         "Extra: \n ${remaining.join('\n ')}";
     throw message;
   }
   return true;
 }
 
 /// Check equivalence of the two iterables, [set1] and [set1], as sets using
 /// [elementEquivalence] to compute the pair-wise equivalence.
@@ skipping 387 matching lines @@
   }
 
   if (index == 1 && skip != 0) {
     return ['${skip}', segmentNumber(index)];
   } else if (index == count) {
     return [segmentNumber(index - 1)];
   } else {
     return [segmentNumber(index - 1), segmentNumber(index)];
   }
 }