Yep, the existentials are the expanded form of @tpolecat's projections. And yeah, there's no reasonable way of merging invariant members...https://twitter.com/dwijnand/status/849217180000559105 …
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I'm not sure `typeOf[L].=:=` is implemented, but if it's looking for an implicit =:=, it will find both ev2 and ev3.
Yeah, you're right... I'm not sure what's going on there!
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