Pakket: libghc-ghc-typelits-knownnat-dev (0.7.7-1)
Verwijzigingen voor libghc-ghc-typelits-knownnat-dev
Debian bronnen:
Het bronpakket haskell-ghc-typelits-knownnat downloaden:
- [haskell-ghc-typelits-knownnat_0.7.7-1.dsc]
- [haskell-ghc-typelits-knownnat_0.7.7.orig.tar.gz]
- [haskell-ghc-typelits-knownnat_0.7.7-1.debian.tar.xz]
Beheerders:
Externe bronnen:
- Homepage [clash-lang.org]
Vergelijkbare pakketten:
- libghc-ghc-typelits-knownnat-prof
- libghc-ghc-typelits-natnormalise-dev
- libghc-ghc-typelits-natnormalise-doc
- libghc-ghc-typelits-natnormalise-prof
- libghc-ghc-typelits-extra-dev
- libghc-ghc-typelits-extra-doc
- libghc-ghc-typelits-extra-prof
- libghc-ghc-tcplugins-extra-dev
- libghc-ghc-tcplugins-extra-doc
- libghc-ghc-tcplugins-extra-prof
- libghc-djinn-ghc-dev
Derive KnownNat constraints from other KnownNat constraints
A type checker plugin for GHC that can derive "complex" KnownNat constraints from other simple/variable KnownNat constraints. i.e. without this plugin, you must have both a KnownNat n and a KnownNat (n+2) constraint in the type signature of the following function:
f :: forall n . (KnownNat n, KnownNat (n+2)) => Proxy n -> Integer f _ = natVal (Proxy :: Proxy n) + natVal (Proxy :: Proxy (n+2))
Using the plugin you can omit the KnownNat (n+2) constraint:
f :: forall n . KnownNat n => Proxy n -> Integer f _ = natVal (Proxy :: Proxy n) + natVal (Proxy :: Proxy (n+2))
The plugin can derive KnownNat constraints for types consisting of:
* Type variables, when there is a corresponding KnownNat constraint
* Type-level naturals
* Applications of the arithmetic expression: +,-,*,^
* Type functions, when there is either:
1. a matching given KnownNat constraint; or
2. a corresponding KnownNat<N> instance for the type function
To use the plugin, add the
OPTIONS_GHC -fplugin GHC.TypeLits.KnownNat.Solver
Pragma to the header of your file.
This package provides a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
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