I wonder if MonoDevelop can compile UnityScript? I'm using Unity 3.3, default MonoDevelop ship with it (Mac).
If I left some error in js file, the Build Output window shows no error. But UnityEditor did report errors when click Play button. However, C# can be compiled correctly with MonoDevelop.
Building: SimpleGame (Debug)
Building Solution SimpleGame
Building: SimpleGame (Debug)
Performing main compilation...
...
Build complete -- 0 errors, 0 warnings
If I double click the References > UnityScript.dll. it shows me below errors (can't load:Bool.Lang.Userful...)

Is this a bug of Unity?
Updated: some guus on Unity forum confirmed that the UnityScript won't compiled in MonoDevelop.
MonoDevelop does support UnityScript, pretty well too actually
– anon85704231The one shipped with Unity doesn't support it as far as I know, does it support UnityScript with all it's features like auto completion etc.? I would consider switching to MonoDevelop if it does.
– SarperSMike thanks for the information, it works great and I'm switching to MonoDevelop too :)
– SarperS