ariwaranosai

trait CanTruthy[A] {
    def truthys(a: A): Boolean
}

object CanTruthy {
    def apply[A](implicit ev: CanTruthy[A]): CanTruthy[A] = ev
    def truthys[A](f: A => Boolean): CanTruthy[A] = new CanTruthy[A] {
        def truthys(a: A): Boolean = f(a)
    }
}

ariwaranosai

import shapeless._
import poly._
import shapeless.ops.tuple.FlatMapper
import syntax.std.tuple._

object Flatten {
  trait LowPriorityFlatten extends Poly1 {
    implicit def default[T] = at[T](Tuple1(_))
  }
  object flatten extends LowPriorityFlatten {