two questions on 4-08-notes

[S.D.Mechveliani]

Dear GHC,

Sorry for the ignorance, just two questions on  4-08-notes.sgml.

> Result type signatures now work.
> 
> [..]
>
> Constant folding is now done by Rules

What do these two mean, or where they are explained?
Maybe, you can give an example?

------------------
Sergey Mechveliani
[EMAIL PROTECTED]