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==:==
seems not to be needed.SingleGeneric
seems not to needRepr
andAux
.Repr
is alwaysStore
.It's important to define instances of macro-based type classes like
rather than
Otherwise
val tc = the[TC[A]]; implicitly[tc.Out =:= B]
compiles butimplicitly[TC.Aux[A, B]]
doesn't. Similarly, otherwisedb.users.store(user)
compiles https://scastie.scala-lang.org/DmytroMitin/wEXiRryiSMaC1AiTYZVYZQ butdb.users.store[User, User :: HNil, UUID :: String :: String :: HNil, User :: HNil](user)
doesn't https://scastie.scala-lang.org/DmytroMitin/wEXiRryiSMaC1AiTYZVYZQ/5 . Ability to specify type parameters can be useful for example for debugging implicits.It's a little weird that constraint
implicit gen: Generic[T]
is put for the type classSingleGeneric
on method level rather than type-class instance level.Maybe
SingleGeneric
can be ordinary type class (not macro-based)?