Proposal: Add isLeft/isRight to Data.Either

[Edward Kmett]

On Fri, Nov 30, 2012 at 6:48 PM, Henning Thielemann <
lemming at henning-thielemann.de> wrote:

>
> On Fri, 30 Nov 2012, Edward Kmett wrote:
>
>  You can add lens to the list of packages that had to define their own
>> (for doctest purposes). ;)
>>
>
> I grepped for isLeft and isRight in lens-3.6 but did not find them.
>

It is used in Projection tests in the as yet unreleased 3.7 on github.

src/Control/Lens/Projection.hs:-- >>> let isLeft  (Left  _) = True; isLeft
 _ = False

-Edward
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/libraries/attachments/20121130/ed3fddde/attachment.htm>