passing and good perf

frog/world.dart

Index: frog/world.dart
diff --git a/frog/world.dart b/frog/world.dart
index 69e069df21309bc6daee9bcbd4313bf7ab51c09f..8fe0892a58da55db27fc3c0216f62e953b84b523 100644
--- a/frog/world.dart
+++ b/frog/world.dart
@@ -62,11 +62,15 @@ class CounterLog {
   int dynamicMethodCalls = 0;
   int typeAsserts = 0;
   int objectProtoMembers = 0;
+  int invokeCalls = 0;
+  int msetN = 0;
 
   info() {
     world.info('Dynamically typed method calls: $dynamicMethodCalls');
     world.info('Generated type assertions: $typeAsserts');
     world.info('Members on Object.prototype: $objectProtoMembers');
+    world.info('Invoke calls: $invokeCalls');
+    world.info('msetN calls: $msetN');
   }
 
   // We need to push a new counter when we are abstract interpreting, so we
@@ -78,9 +82,12 @@ class CounterLog {
     dynamicMethodCalls += other.dynamicMethodCalls;
     typeAsserts += other.typeAsserts;
     objectProtoMembers += other.objectProtoMembers;
+    invokeCalls += other.invokeCalls;
+    msetN += other.msetN;
   }
 }
 
+
 /** Represents a Dart "world" of code. */
 class World {
   WorldGenerator gen;
@@ -464,17 +471,9 @@ class World {
   }
 
   findMainMethod(Library lib) {
-    var mainMembers = lib.topType.resolveMember('main');
-    var main = null;
-    if (mainMembers == null || mainMembers.members.length == 0) {
+    var main = lib.lookup('main', lib.span);
+    if (main == null) {
       fatal('no main method specified');
-    } else if (mainMembers.members.length > 1) {
-      for (var m in mainMembers.members) {
-        main = m;
-        error('more than one main member (using last?)', main.span);
-      }
-    } else {
-      main = mainMembers.members[0];
     }
     return main;
   }