Add typeclass example #5
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Actually I'm not sure if what I added to the neg test should fail, see below for analogy with dependent types
https://scastie.scala-lang.org/lPQIFrhPTL6dNZq2LWDdzg
Every use of
usingshould be replaced instead by context bounds, but this does not work, as the synthetic using parameter is put at the end, so is not available