2014 Applicative => Monad proposal

[Nicolas Trangez]

On Thu, 2013-05-23 at 21:56 +0200, Henning Thielemann wrote:
> I am only concerned with this one:
> 
> > - Promote `join` into the Monad typeclass
> 
> Currently, when I forget to implement the two essential Monad methods 
> 'return' and '>>=' in a Monad instance, I get a warning. However with the 
> mutual implementations of 'join' and '>>=' I do not get a warning but an 
> infinite loop. Similarly, I already had nasty bugs with (a-b) defaulting 
> to (a + negate b) and (negate a) defaulting to (0-a).

http://hackage.haskell.org/trac/ghc/ticket/7633 might help.

Nicolas