mtl-compat: Backported Control.Monad.Except module from mtl
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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Flags
Automatic Flags
| Name | Description | Default |
|---|---|---|
| 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. | Disabled |
| two-point-two | Use mtl-2.2.0.1 with transformers. This will cause this package to export the Control.Monad.Except module. | Disabled |
Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info
Downloads
- mtl-compat-0.2.2.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
For package maintainers and hackage trustees
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| Versions [RSS] | 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] |
| Tested with | ghc ==7.0.4, ghc ==7.2.2, ghc ==7.4.2, ghc ==7.6.3, ghc ==7.8.4, ghc ==7.10.3, ghc ==8.0.2, ghc ==8.2.2, ghc ==8.4.4, ghc ==8.6.5, ghc ==8.8.1 |
| 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 2019-04-28T13:30:42Z |
| Distributions | LTSHaskell:0.2.2, NixOS:0.2.2, Stackage:0.2.2 |
| Reverse Dependencies | 29 direct, 500 indirect [details] |
| Downloads | 35289 total (167 in the last 30 days) |
| Rating | 2.0 (votes: 1) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs available [build log] Last success reported on 2019-04-28 [all 3 reports] |
Readme for mtl-compat-0.2.2
[back to package description]mtl-compat
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.