23 May
2013
23 May
'13
4 p.m.
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