ghc-typelits-natnormalise: GHC typechecker plugin for types of kind GHC.TypeLits.Nat
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Warnings:
- 'ghc-options: -O0' is not needed. Use the --disable-optimization configure flag.
A type checker plugin for GHC that can solve equalities of types of kind
Nat, where these types are either:
Type-level naturals
Type variables
Applications of the arithmetic expressions
(+,-,*,^).
It solves these equalities by normalising them to sort-of SOP
(Sum-of-Products) form, and then perform a simple syntactic equality.
For example, this solver can prove the equality between:
(x + 2)^(y + 2)
and
4*x*(2 + x)^y + 4*(2 + x)^y + (2 + x)^y*x^2
Because the latter is actually the SOP normal form of the former.
To use the plugin, add the
OPTIONS_GHC -fplugin GHC.TypeLits.Normalise
Pragma to the header of your file.
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Properties
| Versions | 0.1, 0.1.1, 0.1.2, 0.2, 0.2.1, 0.3, 0.3.1, 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 0.5, 0.5.1, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.5.6, 0.5.7, 0.5.8, 0.5.9, 0.5.10, 0.6, 0.6.1, 0.6.1, 0.6.2, 0.7, 0.7.1, 0.7.2, 0.7.3, 0.7.4, 0.7.5, 0.7.6, 0.7.7, 0.7.8, 0.7.9, 0.7.10 |
|---|---|
| Change log | CHANGELOG.md |
| Dependencies | base (>=4.9 && <5), ghc (>=8.0.1 && <8.6), ghc-tcplugins-extra (>=0.3), integer-gmp (>=1.0 && <1.1), transformers (>=0.5.2.0 && <0.6) [details] |
| License | BSD-2-Clause |
| Copyright | Copyright © 2015-2016, University of Twente, 2017-2018, QBayLogic B.V. |
| Author | Christiaan Baaij |
| Maintainer | christiaan.baaij@gmail.com |
| Category | Type System |
| Home page | http://www.clash-lang.org/ |
| Bug tracker | http://github.com/clash-lang/ghc-typelits-natnormalise/issues |
| Source repo | head: git clone https://github.com/clash-lang/ghc-typelits-natnormalise.git |
| Uploaded | by ChristiaanBaaij at 2018-05-08T23:00:01Z |
Modules
[Index]
Flags
Manual Flags
| Name | Description | Default |
|---|---|---|
| deverror | Enables `-Werror` for development mode and TravisCI | Disabled |
Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info
Downloads
- ghc-typelits-natnormalise-0.6.1.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
Package maintainers
For package maintainers and hackage trustees
Readme for ghc-typelits-natnormalise-0.6.1
[back to package description]ghc-typelits-natnormalise
A type checker plugin for GHC that can solve equalities
of types of kind Nat, where these types are either:
- Type-level naturals
- Type variables
- Applications of the arithmetic expressions
(+,-,*,^).
It solves these equalities by normalising them to sort-of
SOP (Sum-of-Products) form, and then perform a
simple syntactic equality.
For example, this solver can prove the equality between:
(x + 2)^(y + 2)
and
4*x*(2 + x)^y + 4*(2 + x)^y + (2 + x)^y*x^2
Because the latter is actually the SOP normal form
of the former.
To use the plugin, add
{-# OPTIONS_GHC -fplugin GHC.TypeLits.Normalise #-}
To the header of your file.