mtl-compat: Backported Control.Monad.Except module from mtl

[ bsd3, compatibility, library ] [ Propose Tags ]

This package backports the Control.Monad.Except module from mtl (if using mtl-2.2.0.1 or earlier), which reexports the ExceptT monad transformer and the MonadError class.

This package should only be used if there is a need to use the Control.Monad.Except module specifically. If you just want the mtl class instances for ExceptT, use transformers-compat instead, since mtl-compat does nothing but reexport the instances from that package.

Note that unlike how mtl-2.2 or later works, the Control.Monad.Except module defined in this package exports all of ExceptT's monad class instances. Therefore, you may have to declare import Control.Monad.Except () at the top of your file to get all of the ExceptT instances in scope.


[Skip to Readme]
Versions [RSS] [faq] 0.1, 0.1.1, 0.2.0.4, 0.2.1.1, 0.2.1.2, 0.2.1.3, 0.2.2
Change log CHANGELOG.md
Dependencies base (>=4.3 && <5), mtl (>=2.0.1 && <2.2), transformers-compat (>=0.4 && <0.7) [details]
License BSD-3-Clause
Copyright (C) 2015 Ryan Scott
Author Ryan Scott
Maintainer Ryan Scott <ryan.gl.scott@gmail.com>
Revised Revision 4 made by ryanglscott at 2018-03-21T17:10:13Z
Category Compatibility
Home page https://github.com/haskell-compat/mtl-compat
Bug tracker https://github.com/haskell-compat/mtl-compat/issues
Source repo head: git clone git://github.com/haskell-compat/mtl-compat.git
Uploaded by ryanglscott at 2015-02-13T17:45:22Z
Distributions LTSHaskell:0.2.2, NixOS:0.2.2, Stackage:0.2.2
Downloads 26248 total (658 in the last 30 days)
Rating 2.0 (votes: 1) [estimated by Bayesian average]
Your Rating
  • λ
  • λ
  • λ
Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2015-02-13 [all 1 reports]

Modules

[Index]

Manual Flags

NameDescriptionDefault
two-point-one

Use mtl-2.1.3.1 or earlier with transformers-compat. This will cause this package to export the Control.Monad.Except module.

Enabled
two-point-two

Use mtl-2.2.0.1 with transformers. This will cause this package to export the Control.Monad.Except module.

Disabled
Automatic Flags
NameDescriptionDefault

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

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'.

Maintainer's Corner

For package maintainers and hackage trustees

Candidates


Readme for mtl-compat-0.2.1.1

[back to package description]

mtl-compat Hackage version Build Status

This package backports the Control.Monad.Except module from mtl (if using mtl-2.2.0.1 or earlier), which reexports the ExceptT monad transformer and the MonadError class.

This package should only be used if there is a need to use the Control.Monad.Except module specifically. If you just want mtl class instances for ExceptT, use transformers-compat instead, since mtl-compat does nothing but reexport the instances from that package.

Note that unlike how mtl-2.2 or later works, the Control.Monad.Except module defined in this package exports all of ExceptT's monad class instances. Therefore, you may have to declare import Control.Monad.Except () at the top of your file to get all of the ExceptT instances in scope.