Merge either into transformers

Roman Cheplyaka roma at
Sun Dec 28 22:29:01 UTC 2014

It is already merged (under the name of ExceptT).

On 28/12/14 23:14, Yitzchak Gale wrote:
> Roman Cheplyaka wrote in February 2014:
>>> I proposed to merge either into transformers more than a year ago[1],
>>> and everyone seemed to agree. Could you please do it?
>>> [1]:
> Ross Paterson responded:
>> Not everyone agreed when we discussed this last August.  My proposal then
>> was to introduce a new constructor ExceptT on the same pattern as ReaderT,
>> etc, and to deprecate ErrorT, and that's what I intend to include in the
>> next major release, after GHC 7.8 comes out.
> First of all, GHC 7.8 is well past. Now we are well into the 7.10 zone.
> I re-read the original thread and did not find anyone who disagreed with
> this, so I'm not sure what you mean by that.
> I also didn't find any mention of ExceptT there. The discussion was about
> merging the either library into transformers as is, with the bits that
> are problematic due to non-base dependencies written out by hand
> where possible or else omitted.
> That said, I think everyone will support you, without bikeshedding, if
> you decide to change any of the names and/or deprecate ErrorT.
> Thanks,
> Yitz

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