Type class method with multiple args

typeclass_multiple_args.scala

trait Testable[T,R] {
  def test(t: T, s: String): R
}
object Testable {
  def apply[T,R](implicit testable: Testable[T,R]): Testable[T,R] = testable
  implicit class Ops[T,R](t: T)(implicit testable: Testable[T,R]) {
    def test(s: String): R = Testable[T,R].test(t, s)
  }
  implicit val stringCan: Testable[String,String] = (s1,s2) => s1 + s2
}

import Testable._

"hello".test(" world") //=> hello world