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.


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Versions [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), transformers (>=0.4.1 && <0.6), transformers-compat (>=0.4 && <0.7) [details]
License BSD-3-Clause
Copyright (C) 2015-2017 Ryan Scott
Author Ryan Scott
Maintainer Ryan Scott <ryan.gl.scott@gmail.com>
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 https://github.com/haskell-compat/mtl-compat
Uploaded by ryanglscott at Sun Apr 28 13:30:42 UTC 2019
Distributions LTSHaskell:0.2.2, NixOS:0.2.2, Stackage:0.2.2
Downloads 13091 total (236 in the last 30 days)
Rating 2.0 (votes: 1) [estimated by rule of succession]
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Status Hackage Matrix CI
Docs not available [build log]
Last success reported on 2019-04-28 [all 3 reports]

Modules

  • Control
    • Monad
      • Control.Monad.Except

Flags

NameDescriptionDefaultType
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.

DisabledAutomatic
two-point-two

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

DisabledAutomatic

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

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Readme for mtl-compat-0.2.2

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mtl-compat

Hackage Hackage Dependencies Haskell Programming Language BSD3 License Build

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.