On Thu, Dec 08, 2005 at 05:31:37PM -0500, Thomas Jger wrote:
> Since you're already using GADTs, why not also use them to witness type
> equality:
Thanks for the suggestion! This just illustrates the rule that when using
GADTs the solution to every problem is to introduce another GADT. It
amazes
David Roundy wrote:
] The basic idea is that a patch will have type (Patch a b) where "a" and "b"
] are phantom types. Sequential patches will have identical ending and
] beginning types. So that a sequential pair, for example, can be written as
]
] data Sequential a c where
] Sequential ::
Hello,
Since you're already using GADTs, why not also use them to witness type
equality:
import GHC.Exts
data Patch a b = Patch Int Int
data Sequential a c where
Sequential :: Patch a b -> Patch b c -> Sequential a c
data MaybeEq :: * -> * -> * where
NotEq :: MaybeEq a b
IsEq :: Maybe
Hello all,
I've been working on a sort of static consistency-checking framework for
darcs patches using GADTs and phantom existential types, and am looking for
a bit of advice on whether I might be able to create a class to avoid some
tedious coding overhead.
The basic idea is that a patch will h
