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Yeah, my advice in case of errors is to add the derivation explicitly but most users wish it would work out without any boilerplate 
If I remember correctly, the problem was that it resulted in lots of false positives when Magnolia-derived implicits were considered for types which were later satisfied by different implicits.
Unfortunately, it's not clear to the Magnolia macro that there won't be some other implicit in scope which the compiler tries later, that will conform to the required type. It was a long time ago I did this, though...
I see, thanks for the insights! I recently added an @implicitNotFound annotation to guide users on how to deal with this, hopefully it’ll help. Again thanks for your work on this and I’m glad I’ll get to meet you at Functional Scala!
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