prelude: Prelude module replacement

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

Goals of this package include:

• 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, if you were previously depending on base via

build-depends:
    base ^>= 4.10.0.0 || ^>= 4.11.0.0

replace base by base-noprelude and also add a dependency on prelude like so

build-depends:
    prelude ^>= 0.1.0.0
  , base-noprelude ^>= 4.10.0.0 || ^>= 4.11.0.0

• Prelude