在Scala中为隐式参数隐式转换通用容器

class A
def f(implicit a: A) = 0

class Vendor[T](val v: T)
implicit val vendor = new Vendor(new A)
implicit def vendorToVal[T](implicit v: Vendor[T]) = v.v
f

错误是：’从方法vendorToVal开始,为类型A分散隐式扩展’

这与Lift 2.2依赖注入有关,实际代码如下所示：

class UserStore(implicit db: DbAccess)
object DependencyFactory extends Factory {
  implicit val db = new FactoryMaker[DbAccess](Model) {}
  import db._ // implicit conversion would allow to remove this import

  implicit val userStore = new FactoryMaker[UserStore](new UserStore) {}
}

这个问题与：Is there a way to implicitly convert an implicit parameter in Scala?有关