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Package: libghc-ghc-typelits-knownnat-dev (0.7.12-1 and others)

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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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Download for all available architectures
Architecture Version Package Size Installed Size Files
alpha (unofficial port) 0.7.12-1+b1 94.5 kB964.0 kB [list of files]
amd64 0.7.12-1+b2 66.5 kB520.0 kB [list of files]
arm64 0.7.12-1+b2 65.8 kB639.0 kB [list of files]
armel 0.7.12-1+b2 77.4 kB643.0 kB [list of files]
armhf 0.7.12-1+b2 75.3 kB632.0 kB [list of files]
hppa (unofficial port) 0.7.12-1+b3 124.5 kB985.0 kB [list of files]
i386 0.7.12-1+b2 100.9 kB671.0 kB [list of files]
ia64 (unofficial port) 0.7.9-1+b2 106.9 kB1,835.0 kB [list of files]
loong64 (unofficial port) 0.7.12-1+b2 114.1 kB1,243.0 kB [list of files]
m68k (unofficial port) 0.7.12-1 99.1 kB708.0 kB [list of files]
mips64el 0.7.12-1+b2 88.4 kB946.0 kB [list of files]
ppc64 (unofficial port) 0.7.12-1+b2 79.7 kB955.0 kB [list of files]
ppc64el 0.7.12-1+b2 80.4 kB864.0 kB [list of files]
riscv64 0.7.12-1+b2 107.0 kB1,091.0 kB [list of files]
s390x 0.7.12-1+b2 95.4 kB1,072.0 kB [list of files]
sparc64 (unofficial port) 0.7.12-1+b2 103.4 kB1,898.0 kB [list of files]