Haskell Platform call for consensus: add transformers and revise the mtl package to depend on it

Don Stewart dons at galois.com
Sat Nov 6 12:04:23 EDT 2010

Adding MaybeT would be a change that doesn't need any proposal -- the
maintainers right overrides. Whoever maintains mtl-2 could choose to do
this without discussion.

> Is it really a problem that it goes beyond the primary mission?
> If so, I'll make a separate proposal. And maybe I'll even setup the patch.
> On Nov 6, 2010, at 4:37 PM, Ross Paterson wrote:
> > On Sat, Nov 06, 2010 at 04:17:05PM +0100, Sebastiaan Visser wrote:
> >> Additionally, it would be very useful to have the MaybeT monad transformer included into mtl-2. 
> >> 
> >> While migrating my packages from transformers/monads-fd to the new mtl, the absence of MaybeT was the only problem I came across.
> > 
> > That would be going beyond the primary mission of replacing the existing
> > mtl, though (and transformers still exports MaybeT).
> > 
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