mtl

Monad classes, using functional dependencies

Version on this page:	2.1.3.1
LTS Haskell 22.34:	2.3.1
Stackage Nightly 2024-09-10:	2.3.1
Latest on Hackage:	2.3.1@rev:1

See all snapshots mtl appears in

BSD-3-Clause licensed by Andy Gill

Maintained by Edward Kmett

This version can be pinned in stack with:mtl-2.1.3.1@sha256:a4283d5070cef5061aa8888c88baf50cd2db1904b254701321a93cf6c0835a11,1618

Module documentation for 2.1.3.1

Control
- Control.Monad
  - Control.Monad.Cont
    - Control.Monad.Cont.Class
  - Control.Monad.Error
    - Control.Monad.Error.Class
  - Control.Monad.Identity
  - Control.Monad.List
  - Control.Monad.RWS
    - Control.Monad.RWS.Class
    - Control.Monad.RWS.Lazy
    - Control.Monad.RWS.Strict
  - Control.Monad.Reader
    - Control.Monad.Reader.Class
  - Control.Monad.State
    - Control.Monad.State.Class
    - Control.Monad.State.Lazy
    - Control.Monad.State.Strict
  - Control.Monad.Trans
  - Control.Monad.Writer
    - Control.Monad.Writer.Class
    - Control.Monad.Writer.Lazy
    - Control.Monad.Writer.Strict

Depends on 2 packages(full list with versions):

base, transformers

Used by 184 packages in lts-0.7(full list with versions):

Monad classes using functional dependencies, with instances for various monad transformers, inspired by the paper Functional Programming with Overloading and Higher-Order Polymorphism, by Mark P Jones, in Advanced School of Functional Programming, 1995 (http://web.cecs.pdx.edu/~mpj/pubs/springschool.html).

Changes

2.1.3.1

Avoid importing Control.Monad.Instances on GHC 7.8 to build without deprecation warnings.

2.1.3

Removed the now-irrelevant Error constraint from the MonadError instance for Either e.