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

scala> 

scala> import scala.reflect.mirror._
import scala.reflect.mirror._

scala> def foo[T]{
  val code = reify {
    List[T]()
  }
  println(code.eval)
}
<console>:11: free type: Ident(newTypeName("T")) defined by foo in <console>:10:16
         val code = reify {
                          ^
foo: [T]=> Unit

scala> 

scala>