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trait Empty[E[_]] {
def e[A]: E[A]
}
object T {
val ListEmpty = new Empty[List] {
def e[A] = Nil
}
def foo[F[_]](q:(String,String)) = "hello"
def foo[F[_]](e: Empty[F]) = "world"
val x = foo[List](ListEmpty)
}
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