#10774: Use `Natural` rather than `Integer` in `GHC.TypeLits` -------------------------------------+------------------------------------- Reporter: hvr | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.12.1 Component: libraries/base | Version: 7.10.2 Resolution: | Keywords: TypeLits | Natural Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Description changed by hvr: Old description:
When the numeric type-literals were implement via `GHC.TypeLits` there was no `Natural` type in `base` yet. But since GHC 7.10 we finally have `Natural` available in base!
Specifically, the following 3 type-signatures in `GHC.TypeLits` cpmtaom `Integer` that ought rather be `Natural`s:
{{{#!hs someNatVal :: Integer -> Maybe SomeNat
natVal :: forall n proxy. KnownNat n => proxy n -> Integer
natVal' :: forall n. KnownNat n => Proxy# n -> Integer }}}
New description: When the numeric type-literals were implement via `GHC.TypeLits` there was no `Natural` type in `base` yet. But since GHC 7.10 we finally have `Natural` available in base! Specifically, the following 3 type-signatures in `GHC.TypeLits` contain `Integer`s that ought rather be `Natural`s: {{{#!hs someNatVal :: Integer -> Maybe SomeNat natVal :: forall n proxy. KnownNat n => proxy n -> Integer natVal' :: forall n. KnownNat n => Proxy# n -> Integer }}} -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10774#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler