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Source: haskell-ghc-typelits-knownnat
Maintainer: Debian Haskell Group <pkg-haskell-maintainers@lists.alioth.debian.org>
Uploaders: Scott Talbert <swt@techie.net>
Priority: optional
Section: haskell
Build-Depends: debhelper (>= 10),
haskell-devscripts-minimal | haskell-devscripts (>= 0.13),
cdbs,
ghc,
ghc-prof,
libghc-ghc-tcplugins-extra-dev (>= 0.3.1),
libghc-ghc-tcplugins-extra-prof,
libghc-ghc-typelits-natnormalise-dev (>= 0.7.1),
libghc-ghc-typelits-natnormalise-dev (<< 0.8),
libghc-ghc-typelits-natnormalise-prof,
libghc-tasty-dev (>= 0.10),
libghc-tasty-prof,
libghc-tasty-hunit-dev (>= 0.9),
libghc-tasty-hunit-prof,
libghc-tasty-quickcheck-dev (>= 0.8),
libghc-tasty-quickcheck-prof,
Build-Depends-Indep: ghc-doc,
libghc-ghc-tcplugins-extra-doc,
libghc-ghc-typelits-natnormalise-doc,
Standards-Version: 4.7.0
Homepage: https://clash-lang.org/
Vcs-Browser: https://salsa.debian.org/haskell-team/DHG_packages/tree/master/p/haskell-ghc-typelits-knownnat
Vcs-Git: https://salsa.debian.org/haskell-team/DHG_packages.git [p/haskell-ghc-typelits-knownnat]
X-Description: 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.
Package: libghc-ghc-typelits-knownnat-dev
Architecture: any
Depends: ${haskell:Depends},
${misc:Depends},
${shlibs:Depends},
Recommends: ${haskell:Recommends},
Suggests: ${haskell:Suggests},
Conflicts: ${haskell:Conflicts},
Provides: ${haskell:Provides},
Description: ${haskell:ShortDescription}${haskell:ShortBlurb}
${haskell:LongDescription}
.
${haskell:Blurb}
Package: libghc-ghc-typelits-knownnat-prof
Architecture: any
Depends: ${haskell:Depends},
${misc:Depends},
Recommends: ${haskell:Recommends},
Suggests: ${haskell:Suggests},
Conflicts: ${haskell:Conflicts},
Provides: ${haskell:Provides},
Description: ${haskell:ShortDescription}${haskell:ShortBlurb}
${haskell:LongDescription}
.
${haskell:Blurb}
Package: libghc-ghc-typelits-knownnat-doc
Architecture: all
Section: doc
Depends: ${haskell:Depends},
${misc:Depends},
Recommends: ${haskell:Recommends},
Suggests: ${haskell:Suggests},
Conflicts: ${haskell:Conflicts},
Description: ${haskell:ShortDescription}${haskell:ShortBlurb}
${haskell:LongDescription}
.
${haskell:Blurb}
|
