mtl

Monad classes, using functional dependencies

http://github.com/ekmett/mtl

Version on this page:2.1.3.1
LTS Haskell 22.17:2.3.1
Stackage Nightly 2024-04-18:2.3.1
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

Depends on 2 packages(full list with versions):
base, transformers

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.