| Line No. | Rev | Author | Line |
|---|---|---|---|
| 1 | 1 | paulosilva | |
| 2 | {-# LANGUAGE ExistentialQuantification #-} | ||
| 3 | {-# OPTIONS_GHC -Wall #-} | ||
| 4 | |||
| 5 | ------------------------------------------------------------------------------- | ||
| 6 | |||
| 7 | {- | | ||
| 8 | Module : Data.Existential | ||
| 9 | Description : Existential type patterns. | ||
| 10 | Copyright : (c) Paulo Silva | ||
| 11 | License : LGPL | ||
| 12 | |||
| 13 | Maintainer : paufil@di.uminho.pt | ||
| 14 | Stability : experimental | ||
| 15 | Portability : portable | ||
| 16 | |||
| 17 | -} | ||
| 18 | |||
| 19 | ------------------------------------------------------------------------------- | ||
| 20 | |||
| 21 | module Data.Existential where | ||
| 22 | |||
| 23 | data Exists singleton term = forall t . Exists (singleton t) (term t) | ||
| 24 | |||
| 25 | data Covert t = forall x . Hide (t x) | ||
| 26 |