Adding an ignore function to Control.Monad

[Don Stewart]

I for one don't like 'ignore' -- it implies to me somehow that the
argument itself is ignored, rather than the result after evaluation.

Also, 'void' already exists, and is part of a decade-old FFI standard.

-- Don

ekmett:
> I agree with Neil on all those points. F.M.E.void has too many things to fix to
> bring it inline with ignore in one go and a worse name. 
> 
> +1 on adding ignore though.
> 
> -Edward Kmett
> 
> On Thu, Jul 2, 2009 at 2:26 AM, Neil Mitchell <ndmitchell at gmail.com> wrote:
> 
>     void is the wrong name, wrong type, wrong purpose and wrong module. We
>     could fix all those things, but I think we should just add ignore as
>     previously agreed (+1 for that)
> 
>     Thanks, Neil
> 
>     On Thu, Jul 2, 2009 at 4:11 AM, Isaac
>     Dupree<ml at isaac.cedarswampstudios.org> wrote:
>     > Gwern Branwen wrote:
>     >>
>     >> Since then, Don Stewart has pointed out
>     >> http://hackage.haskell.org/trac/ghc/ticket/3292 that there is a very
>     >> similar function specified in the FFI standard
>     >> http://www.cse.unsw.edu.au/~chak/haskell/ffi/ffi/ffise5.html#
>     x8-350005.10
>     >> - 'void     :: IO a -> IO ()'.
>     >
>     > Are we willing to change (generalize) the type of
>     > Foreign.Marshal.Error.void?  If so, we could export (void :: Functor m =>
>     m
>     > a -> m ()) from both Control.Monad and F.M.E (if we wanted to).  If we're
>     > not willing, then I think it would be a bit more convenient to name them
>     > different things (so that if you import both modules you don't get a
>     > name-conflict for using 'void').
>     >
>     > I vote to just name it Control.Monad.ignore .  Many people independently
>     > invented the name "ignore" in their own projects.  Also I suspect the
>     name
>     > "void" in FFI has some etymology in C's equivalent, casting expressions
>     to
>     > void (eg: (void)printf(something); ) which I doubt most haskell coders
>     care
>     > about most of the time?
>     >
>     > -Isaac
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