[Haskell-cafe] Monad Laws and Do Notation

[Ivan Lazar Miljenovic]

On 22 September 2011 11:46, diazepan <spanishbizarro3 at yahoo.com> wrote:
> I've got this expression
>
> expression = do
>        w <- "hello"
>        y <- "to you"
>        return w
>
> I wanna know how can I reduce it using monad laws

I don't think you can: the best you can do is minimise it with other
monadic functions.  The general case you can do something like discard
from polyparse:
http://hackage.haskell.org/packages/archive/polyparse/latest/doc/html/Text-ParserCombinators-Poly-Base.html#v:discard

-- 
Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com
IvanMiljenovic.wordpress.com