[Haskell-cafe] Making MVar and Chan Instances of Typeable
tomasz.zielonka at gmail.com
Fri Nov 5 09:51:04 EST 2004
On Fri, Nov 05, 2004 at 01:57:53PM +0100, Benjamin Franksen wrote:
> Hello Experts,
> I need MVar and Chan to be instances of Typeable. Any hint on how this is most
> easily done would be greatly appreciated. I could change the libraries and
> add 'deriving Typeable' but I hesitate to do so.
The easiest way is to hide type constructor Chan:
newtype MyChan a = MyChan (Chan a) deriving Typeable
Of course, you can also write the instance for Chan by hand.
.signature: Too many levels of symbolic links
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