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

scala> import language.experimental.macros
import language.experimental.macros

scala> def pos_impl(c: reflect.macros.Context): c.Expr[String] =
  c.literal(c.enclosingPosition.getClass.toString)
pos_impl: (c: scala.reflect.macros.Context)c.Expr[String]

scala> def pos = macro pos_impl
pos: String

scala> pos
res0: String = class scala.reflect.internal.util.RangePosition

scala>