[Haskell-cafe] ListT considered harmful

Michael Snoyman michael at snoyman.com
Fri Mar 27 04:07:56 UTC 2015

I'm in favor of deprecation, but opposed to removing any time soon due to
backwards compatibility concerns.

On Fri, Mar 27, 2015 at 7:03 AM Fumiaki Kinoshita <fumiexcel at gmail.com>

> It is well known that ListT m in transformers is not a monad unless the
> underlying monad is commutative. The fact that ListT is not a monad
> transformer is sufficient to remove it from the package, and several
> packages already defined their own ListT.
> Oughtn't we deprecate ListT or replace it by a correct one?
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