Re: Proposal: merge Data.Functor.Coproduct into transformers

On Tue, Dec 11, 2012 at 1:42 PM, wren ng thornton wrote:

On 12/11/12 7:27 AM, Mario Blazevic wrote:

...

On Tue, Dec 11, 2012 at 5:29 AM, Edward Kmett wrote:

...

I'm not wedded to its current behavior of wrapping an Either. It was kind of nice that converting to and from Either was a no-op on GHC, but that could change.

I agree that I wouldn't want to add functions named 'left' and 'right', so moving to a data type rather than a newtype seems reasonable.

Perhaps

data Coproduct f g a = LeftF (f a) | RightF (g a)

would be a nice color for the bikeshed?

+1.

I hesitate to suggest another alternative, but if folks are displeased with those names, there's always the tried and true InL/InR or InjL/InjR. But given the precedent of Either, I think LeftF/RightF have a nice ring to them.

Another possibility is data EitherF f g a = LeftF (f a) | RightF (g a) But +1 to the proposal no matter the names, +1 to LeftF/RightF, +0 to any particular type name (including this one). -- Your ship was destroyed in a monadic eruption.