Add num.parse.

runtime/lib/double_patch.dart

Index: runtime/lib/double_patch.dart
diff --git a/runtime/lib/double_patch.dart b/runtime/lib/double_patch.dart
index 9e2abeb4ece9d7ee80a7404bca87f8e635038d55..6a597a8b354e5a76aa0448553d50c6779a285e63 100644
--- a/runtime/lib/double_patch.dart
+++ b/runtime/lib/double_patch.dart
@@ -45,6 +45,8 @@ patch class double {
       if (onError == null) throw new FormatException(str);
       return onError(str);
     }
+    // Parse can create a NaN that is not identical to double.NAN.
+    if (result.isNaN) return NAN;

[Lasse Reichstein Nielsen, 2013/11/25 12:37:40]

This seems like an unnecessary hack.

The NaNs should be considered equal by Instance::IsIdenticalTo, which is what
the native Identical_comparison uses. Apparently something else happens instead.

[floitsch, 2013/11/25 12:50:53]

completely agree.
Please file a bug for the VM so that this can't happen for other NANs.

     return result;
   }
 }