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[ Source: haskell-ghc-typelits-natnormalise  ]

Package: libghc-ghc-typelits-natnormalise-dev (0.7.9-1 and others)

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GHC typechecker plugin for types of kind GHC.TypeLits.Nat

A type checker plugin for GHC that can solve equalities and inequalities 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.

This package provides a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.

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Architecture Version Package Size Installed Size Files
alpha (unofficial port) 0.7.9-1+b1 272.7 kB2,956.0 kB [list of files]
amd64 0.7.9-1+b2 171.2 kB1,292.0 kB [list of files]
arm64 0.7.9-1+b2 167.9 kB1,660.0 kB [list of files]
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armhf 0.7.9-1+b3 160.7 kB1,460.0 kB [list of files]
hppa (unofficial port) 0.7.9-1+b4 366.0 kB3,182.0 kB [list of files]
i386 0.7.9-1+b2 292.1 kB1,933.0 kB [list of files]
ia64 (unofficial port) 0.7.9-1+b2 300.3 kB6,220.0 kB [list of files]
m68k (unofficial port) 0.7.7-1 266.9 kB2,077.0 kB [list of files]
mips64el 0.7.9-1+b2 247.3 kB2,905.0 kB [list of files]
ppc64 (unofficial port) 0.7.9-1+b2 230.3 kB3,049.0 kB [list of files]
ppc64el 0.7.9-1+b2 247.1 kB2,680.0 kB [list of files]
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s390x 0.7.9-1+b2 223.4 kB2,678.0 kB [list of files]
sparc64 (unofficial port) 0.7.9-1+b1 291.4 kB4,223.0 kB [list of files]