Proposal: Add isLeft/isRight to Data.Either

Henning Thielemann lemming at
Sat Dec 1 00:48:46 CET 2012

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.

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