[nem-en] implementation of Message.FatalError

[Kamil Skalski]

> So I think we need a new boot with builtin
> namespace Message
> {
>    macro FatalError
> }
>

Yes, I think it is a good idea. You will need to create a macro (e.g.
in macros/compiler.n):

namespace Nemerle.Compiler.Message {
 ...
}

and then after boot-straping  remove the normal method. I think it
should not cause many problems.

-- 
Kamil Skalski
http://nazgul.omega.pl