[Haskell-cafe] Type level natural numbers
Mateusz Kowalczyk
fuuzetsu at fuuzetsu.co.uk
Wed Apr 3 21:42:16 CEST 2013
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About two weeks ago we got an email (at ghc-users) mentioning that
comparing to 7.6, 7.7.x snapshot would contain (amongst other things),
type level natural numbers.
I believe the package used is at [1].
Can someone explain what use is such package in Haskell? I understand
uses in a language such as Agda where we can provide proofs about a
type and then use that to perform computations using the type system
(such as guaranteeing that concatenating two vectors together will
give a new one with the length of the two initial vectors combine)
however as far as I can tell, this is not the case in Haskell
(although I don't want to say ?impossible? and have Oleg jump me).
- --
Mateusz K.
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