libghc-ghc-typelits-knownnat-prof
Derive KnownNat constraints from other KnownNat constraints; profiling libraries
Description
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, compiled
for profiling. See http://www.haskell.org/ for more information on Haskell.Upload more screenshots
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