[Haskell-cafe] Re: Not to load Prelude

[Henning Thielemann]

On Fri, 11 Jan 2008, Luke Palmer wrote:

> So, when you write the number 3 in Haskell, GHC converts this to
> essentially (Prelude.fromInteger (3::Integer)) in its internal format.
>  So it doesn't matter if you import Prelude (), Prelude's version of
> fromInteger still gets called.  If you give -fno-implicit-prelude,
> then this is converted to simply (fromInteger (3::Integer)), without
> the hard-coded prelude reference.  That means you could write your own
> version of fromInteger that does something different.  A common usage
> for -fno-implicit-prelude (insofar as it is used at all, which is
> seldom) is to replace the standard Num hierarchy with a saner one,
> with numeric literals resolving to that one instead.
>
> There are a few other hard-coded references to Prelude in the internal
> format, but I don't remember what they are offhand.
> -fno-implicit-prelude gets rid of those, too.

For details, see:
  http://www.haskell.org/ghc/docs/latest/html/users_guide/ghc-language-features.html

I have summarized the answers so far:
  http://www.haskell.org/haskellwiki/No_import_of_Prelude