Signature of Control.Monad when and unless

[Oren Ben-Kiki]

I understand why the normal signature is:

    when :: Monad m => Bool -> m () -> m ()
    unless :: Monad m => Bool -> m () -> m ()

But why isn't there also:

    when_ :: Monad m => Bool -> m a -> m ()
    unless_ :: Monad m => Bool -> m a -> m ()

That is, I agree that results shouldn't be discarded "by default", but it
should be easy to get rid of them if they are unneeded.

Thanks,

    Oren Ben-Kiki
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