[Haskell-cafe] ListT considered harmful

[Fumiaki Kinoshita]

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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