Removing MonadFail from Monad

[Roman Cheplyaka]

* David Luposchainsky <dluposchainsky at googlemail.com> [2013-12-16 23:57:19+0100]
> > I don't understand the restriction "is defined via data" since I am not
> > aware of defining constructors outside of data or with something other
> > than the data keyword.  Please clarify.
> 
> I meant "data and not newtype". If "Only" is a newtype data constructor,
> the pattern is irrefutable by design, is it not?

One notable case of one-constructor types defined not via data is
tuples. You certainly don't want warnings for that!

Regarding newtypes vs data, I'm not so sure it should make a difference.
It's customary to make one-field types newtypes, and then, if one
realizes that more fields are needed, turn them into proper data types.

Roman
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