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Polymorphic function values are one of the key abstractions in shapeless: they are crucial to enabling sequence-like operations such as map, flatMap and filter to be performed on HLists (data structures which combine the heterogeneous typing of tuples with list-like characteristics).
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Expanding eta-expansion: shapeless polymorphic function values meet macros
Miles has been doing stuff with Scala for more than ten years, currently with Underscore Consulting. He is a cofounder of Typelevel and his best known project, the Scala generic programming library shapeless, is the weapon of choice wherever boilerplate needs to be scrapped or arities abstracted over.