Apply updates to static methods.

dart/pkg/dart2js_incremental/lib/diff.dart

Index: dart/pkg/dart2js_incremental/lib/diff.dart
diff --git a/dart/pkg/dart2js_incremental/lib/diff.dart b/dart/pkg/dart2js_incremental/lib/diff.dart
index e3fad3afd209bf748bf555ccea6b1603c4239bfb..c2ed650eebbcf299d774bc10b4e60a83073e3ef5 100644
--- a/dart/pkg/dart2js_incremental/lib/diff.dart
+++ b/dart/pkg/dart2js_incremental/lib/diff.dart
@@ -33,7 +33,11 @@ class Difference {
   final DeclarationSite after;
   Token token;

[Johnni Winther, 2014/10/16 07:48:46]

Add comment on the semantics of [token].

[ahe, 2014/10/16 09:19:48]

Done.

 
-  Difference(this.before, this.after);
+  Difference(this.before, this.after) {
+    if (before == after) {
+      throw '[before] and [after] are the same.';
+    }
+  }
 
   String toString() {
     if (before == null) return 'Added($after)';
@@ -48,8 +52,10 @@ List<Difference> computeDifference(
   Map<String, DeclarationSite> beforeMap = <String, DeclarationSite>{};
   before.forEachLocalMember((modelx.ElementX element) {
     DeclarationSite site = element.declarationSite;
-    assert(site != null);
-    beforeMap[element.name] = site;
+    assert(site != null || element.isSynthesized);
+    if (!element.isSynthesized) {
+      beforeMap[element.name] = site;
+    }
   });
   List<Difference> modifications = <Difference>[];
   List<Difference> potentiallyChanged = <Difference>[];