Type in expressions to have them evaluated.
Type :help for more information.

scala> {
  import scala.reflect.runtime.universe._
  val x = "2"
  val tt = implicitly[TypeTag[x.type]]
  println(tt)
}
<console>:11: free term: Ident(TermName("x")) defined by res0  in <console>:10:21
                val tt = implicitly[TypeTag[x.type]]
                                   ^
TypeTag[x.type]

scala> :quit