Add comment to mock-compiler.

tests/compiler/dart2js/mock_compiler.dart

Index: tests/compiler/dart2js/mock_compiler.dart
diff --git a/tests/compiler/dart2js/mock_compiler.dart b/tests/compiler/dart2js/mock_compiler.dart
index 7d0b8326781a8095890ce46ed37ae0084a480120..5005af6c4274cf904440a34f70d4456f2c65ae94 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -96,6 +96,10 @@ class MockCompiler extends Compiler {
 
     mainApp = mockLibrary(this, "");
     initializeSpecialClasses();
+    // We need to make sure the Object class is resolved. When registering a
+    // dynamic invocation the ArgumentTypesRegistry eventually iterates over

[ahe, 2012/10/18 16:42:30]

In that case, the ArgumentTypesRegistry registry should really make sure that
objectClass is resolved.

[floitsch, 2012/10/18 17:16:50]

Should I file a bug?

[ahe, 2012/10/22 16:50:08]

Yes, that would be great!

+    // the interfaces of the Object class which would be 'null' if the class
+    // wasn't resolved.
     objectClass.ensureResolved(this);
   }