#4385: Type-level natural numbers --------------------------------------------+------------------------------ Reporter: diatchki | Owner: diatchki Type: feature request | Status: new Priority: normal | Milestone: 7.6.2 Component: Compiler (Type checker) | Version: Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by Lemming): Replying to [comment:67 hvr]:

Replying to [comment:66 Lemming]:

...

Type-level natural numbers are advertised everywhere for GHC-7.8, but I cannot find documentation in http://www.haskell.org/ghc/docs/7.8.1-rc2/html/users_guide/

does http://www.haskell.org/ghc/docs/7.8.1-rc2/html/users_guide/promotion.html #promoted-literals count?

Indeed, that's a nice start. What about type-level natural number operations and predicates? What about conversion from type-level numbers to data-level numbers? I found: https://ghc.haskell.org/trac/ghc/wiki/TypeNats/Basics https://ghc.haskell.org/trac/ghc/wiki/TypeNats/Operations Do these articles reflect the current state of implementation? I also found the announcement: http://www.well-typed.com/blog/85 where many feature names are linked to the GHC documentation, but "type- level natural numbers" is not. I also like to see the keyword "type-level natural number" somewhere in GHC docs, since this is how this feature is advertised. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/4385#comment:68 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler