#2309: containers: specialize functions that fail in a Monad to Maybe

[Nicolas Pouillard]

Excerpts from Ross Paterson's message of Sat Jul 19 01:29:40 +0200 2008:
> To summarize:
> 
> Several container classes have types like
> 
>     lookup :: (Monad m, Ord k) => k -> Map k a -> m a

And what about keeping the monadic version under another name like lookupM?

Cheers,

-- 
Nicolas Pouillard aka Ertai
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