Basic dart^2 analyzer tests running.

pkg/analyzer_experimental/lib/src/generated/constant.dart

Index: pkg/analyzer_experimental/lib/src/generated/constant.dart
diff --git a/pkg/analyzer_experimental/lib/src/generated/constant.dart b/pkg/analyzer_experimental/lib/src/generated/constant.dart
index 3196a6fe08af1cd8b0f46c7df95bac4fe986637e..9ff784526da035b286098bb8bb9813e03e689045 100644
--- a/pkg/analyzer_experimental/lib/src/generated/constant.dart
+++ b/pkg/analyzer_experimental/lib/src/generated/constant.dart
@@ -636,10 +636,8 @@ class DirectedGraph<N> {
    * @return a sink node
    */
   N findSink() {
-    for (MapEntry<N, Set<N>> entry in getMapEntrySet(_edges)) {
-      if (entry.getValue().isEmpty) {
-        return entry.getKey();
-      }
+    for (N key in _edges.keys) {
+      if (_edges[key].isEmpty) return key;
     }
     return null;
   }