Prelude: Difference between revisions
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==Avoiding Prelude== | ==Avoiding Prelude== | ||
If you wish to program without a prelude or to use a custom version of it you can suppress its automatic inclusion in several ways. | If you wish to program without a prelude or to use a custom version of it you can suppress its automatic inclusion in several ways. The problem is also tackled in a [[No import of Prelude|FAQ entry]]. | ||
===Explicit import decalration=== | ===Explicit import decalration=== | ||
By including an explicit import declaration of Prelude as follows | By including an explicit import declaration of Prelude as follows | ||
Revision as of 19:38, 11 January 2008
Prelude is a module that contains a small set of standard definitions and is included automatically into all Haskell modules.
Documentation
The documentation of prelude from GHC can be found here.
Avoiding Prelude
If you wish to program without a prelude or to use a custom version of it you can suppress its automatic inclusion in several ways. The problem is also tackled in a FAQ entry.
Explicit import decalration
By including an explicit import declaration of Prelude as follows
import Prelude ()The empty import list in the parenthesis causes nothing to be imported while the automatic import is prevented as well.
Language option
GHC supports a language option -XNoImplicitPrelude (or -fno-implicit-prelude in older GHC) that makes it not import Prelude implicitly. The option can be also specified by adding:
{-# LANGUAGE NoImplicitPrelude #-}on top of the module.
This option makes it possible to rebind the monadic do syntax.