Prelude: A Prelude module replacement

[ bsd3, library, prelude ] [ Propose Tags ]

This package provides a Prelude module drop-in replacement for base's Prelude module.

Goals of this package include:

  • Be reasonably modest and remain close in spirit to the base package's scope

  • Depend only on base (via base-noprelude) for recent GHC versions

  • Avoid partial functions being in scope by default; redefine common partial functions such as read or head to be Maybe-valued

  • Provide a uniform Prelude across multiple GHC releases (currently GHC 7.0 and newer supported) to the extent possible given typeclass restructurings such as AMP or FTP

  • Reduce import clutter by reexporting common verbs from modules such as Control.Monad and Control.Applicative

Versioning and Usage

This package is intended to be used in combination with base-noprelude and possibly base-orphans. Prelude strives to be faithful to the PVP; however, for technical reasons Prelude's API is not fully determined by its version due to changes in core typeclasses and consequently it's strongly advised to declare a dependency on Prelude always in conjunction with a dependency on base-noprelude.

For instance, all you need to do in order to use this package if you were previously depending on base via

    base (>= && < 4.11) || ^>=

is to replace base by base-noprelude and also add a dependency on Prelude like so

    Prelude ^>=
  , base-noprelude (>= && < 4.11) || ^>=

and this will effectively replace the implicit Prelude module.

Alternatively, if you only intend to support GHC 7.10 and newer, you can make use mixins like so

    Prelude ^>=
  , base (>= && < 4.12) || ^>=

mixins: base hiding (Prelude)


Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

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Versions [RSS],
Dependencies base (>=4.3 && <4.14), fail (>=4.9 && <4.10), ghc-prim (>=0.2 && <0.3), semigroups (>=0.18.5 && <0.19), transformers (>= && <0.6) [details]
License BSD-3-Clause
Copyright 2017-2018 Herbert Valerio Riedel
Author Herbert Valerio Riedel
Revised Revision 1 made by HerbertValerioRiedel at 2019-09-10T09:09:10Z
Category Prelude
Bug tracker
Source repo head: git clone
Uploaded by HerbertValerioRiedel at 2018-08-29T17:01:41Z
Reverse Dependencies 2 direct, 0 indirect [details]
Downloads 2127 total (6 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2018-08-29 [all 1 reports]