On Thursday, March 28, 2002, 16:37 CET James B. White III wrote: > [...] > I think the default definition of ">>" is just that, a default, and not a > law.
I suppose, a >> b = a >>= \_ -> b is intended to be a law. This would mean that every redefined (>>) would have to obey this law. > [...] > If it is a law, why are users given the power to change it! For performance reasons, I would suppose. > Also, I think that the Report *specifies* the translation of "do" to ">>", > not merely suggests it. The report specifies certain identities and suggests to use these identities for translations into the kernel. If it is also a law that a >> b and a >>= \_ -> b are identical even with respect to laziness then, I think, a conforming Haskell implementation could use the latter instead of the former to realize do expressions. But I would prefer implementations using (>>). > [...] > ">>" should no longer be a class function with a default value that can be > changed; it should be syntactic sugar built into Haskell, like "do" > notation. It shouldn't be syntactic suger but at most an operator which does not belong to the monad class. One could define (>>) just as an ordinary function instead of a class member. > [...] By the way, why uses the report the complicated looking \_ -> b instead of just const b. Wolfgang _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
