@propensive Cool. I thought it might be related to https://issues.scala-lang.org/browse/SI-2712 , in which case Unpack (shapeless) or Unapply (Scalaz) might help.
So one of my type parameters was more superfluous than I first thought, and one was more contravariant. Happy again now! /cc @milessabin
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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