[Haskell] overuse of maybe and  in prelude and libs
simonpj at microsoft.com
Thu Apr 8 18:41:21 EDT 2004
| > Haskell is pretty good about letting you install a different
Prelude, so you could try it yourself.
| Hmm. That's interesting! How does this work?
It's very simple. Write your own Prelude as a Haskell module MyPrelude.
Then to use it, say
module Foo where
import Prelude ()
(GHC lets you omit the 'import Prelude ()' by saying
No, there is no auto-magic; you are simply getting a different library,
that is all. And you have to write that library.
No problem with some modules using MyPrelude and some using Prelude.
(Any more than there's a problem when some modules import module A and
some import module B.)
Actually Haskell doesn't let you redefine *everything*, but GHC does:
read section 7.3.5 of the GHC manual
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