给定以下对象

object functions {

  type MyOutput = String

  def f1: MyOutput = "res1"

  def f2: MyOutput = "res2"

  def f3(foo: String): Boolean = foo.equals("bar")

  def f4(in:String): MyOutput = in+"res4"
}

是否可以调用此对象上的所有方法，其返回类型为MyOutput类型？
目前我尝试使用反射，但没有运气。

import scala.reflect.runtime.universe._

val m = runtimeMirror(getClass.getClassLoader)
val instanceMirror = m.reflect(typeOf[functions.type])
val classSymbol = m.classSymbol(functions.getClass)
val methods = classSymbol.info.members.filter(_.isMethod)
methods.foreach({
  method =>
    if (method.info.resultType.toString.contains("MyOutput")) {
      println(method.name.toString)
      val methodm = instanceMirror.reflectMethod(method.asMethod)
      methodm()
    }
})

这是错误scala.ScalaReflectionException: expected a member of class UniqueSingleType, you provided method