gistfile1.scala

import scala.reflect.runtime.universe._
import scala.reflect.api.{TypeCreator, Universe}

object Test extends App {
  def foo[T: TypeTag] = TypeTag(typeTag[T].mirror, new TypeCreator {
    override def apply[U <: Universe with Singleton](m: scala.reflect.api.Mirror[U]): U # Type = {
      typeTag[T].in(m).tpe match {
        case TypeRef(_, _, argHead :: Nil) => argHead.asInstanceOf[U#Type]
      }
    }
  })

  println(foo[List[Int]])
}

08:23 ~/Projects/Kepler_snippet00/sandbox (topic/snippet00)$ scalac Test.scala && scala Test
TypeTag[Int]