IdentityT to transformers

[Henning Thielemann]

On Thu, 12 Feb 2009, Henning Thielemann wrote:

> Unfortunately I have just another wish. In a parser I like to show by types 
> whether the parser can fail or not. To this end I have a type parameter for a 
> monad transformer that can be instantiated either by MaybeT or by IdentityT. 
> The only problem is, that there is no IdentityT in transformers package, yet.

Does the attached module makes sense?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Identity.hs
Type: text/x-haskell
Size: 2481 bytes
Desc: 
Url : http://www.haskell.org/pipermail/libraries/attachments/20090212/01b9f275/Identity.bin