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Scala 3 introduced
scala.util.NotGiven: a special class used to implement negation in implicit search.While techniques existed to implement this functionality in some cases in Scala 2, the
NotGiventrait was not backported to Scala 2. This makes cross-compilation more frustrating than it needs to be, so this module was created to make a singleorg.typelevel.scalaccompat.scala.util.NotGivenavailable to Scala 2.12, 2.13, and 3.This is based on prior work by Shapeless and fs2.
This was initially proposed as typelevel/tsc#171, but I agree that this repo is a better home for this code.