使用默认值Scala多个隐式参数会导致值不明确

我一直在讨论从3个方法中重构公共代码并进入makeRequest()的问题,但是我从编译器得到了模糊的隐式匹配.我不确定这是否来自隐式方法或其他问题的默认值,但我的目标是getRequest / deleteRequest / postRequest可以简单地调用makeRequest(“GET”)/ makeRequest(“DELETE”)/ makeRequest(“POST”) ).以前没有任何参数是隐含的,我只是试图通过使用implicits来达到目标

def makeRequest(method: String)(implicit path: String,base: String,params: Seq[(String,String)],body: Option[String],retriesLeft: Int): Future[WSResponse] = ???

def getRequest()(implicit path: String,base: String = baseUrl,String)] = Seq(),body: Option[String] = None,retriesLeft: Int = retries): Future[WSResponse] = makeRequest("GET")

def deleteRequest()(implicit path: String,retriesLeft: Int = retries): Future[WSResponse] = makeRequest("GET")

def postRequest[T]()(path: String,body: T,retriesLeft: Int = retries)
  (implicit wrt: play.api.http.Writeable[T],ct : play.api.http.ContentTypeOf[T]): Future[WSResponse] = makeRequest("POST")

我得到这个和deleteRequest相同

ambiguous implicit values:
[error]  both value base of type String
[error]  and value path of type String
[error]  match expected type String
[error]     def getRequest()(implicit path: String,retriesLeft: Int = retries): Future[WSResponse] = makeRequest("GET")

case class Path(p: String) extends AnyVal

case class Path(s: String) extends AnyVal
case class BaseUrl(s: String) extends AnyVal

def foo(implicit a: Path,b: BaseUrl) = a.s ++ b.s

implicit val a: Path = Path("a")
implicit val b: BaseUrl = BaseUrl("b")

scala> foo
res0: String = ab