JassHelper Compile error?

I'm trying to use type spellbook extends integer in my script, though it compiles correctly.

But no matter where i place it, whenever i test my map after jasshelper compiles, it comes to the main menu.

Err.. don't take offense but did you save? :3

I do that alot... forget to save I mean.

Yes, I made sure I saved.

It happens no matter what.

I don't think you can extend native types with the type keyword in vJass.

That only compiles because it is what is used in common.j

So I can only extend something that extends something?

Like a unit, because units extend widgets?