macro for wrapping simple values with Future.successful

FutureMacro.scala

implicit class FutureCompanionW(val underyling: Future.type) extends AnyVal {
  def smart[A](a: A)(implicit ec: ExecutionContext): Future[A] = macro smartFutureMacroImpl[A]
}

def smartFutureMacroImpl[A: c.WeakTypeTag](c: Context)(a: c.Expr[A])(ec: c.Expr[ExecutionContext]): c.Expr[Future[A]] = {
  import c.universe._

  a.tree match {
    case _: Literal | _: Ident => reify(Future successful a.splice)
    case _                     => reify(Future(a.splice)(ec.splice))
  }
}