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.BlackboxContext): c.Expr[String] = {
  import c.universe._
  c.Expr[String](Literal(Constant(c.enclosingPosition.getClass.toString)))
}
pos_impl: (c: scala.reflect.macros.BlackboxContext)c.Expr[String]

scala> def pos: String = macro pos_impl
defined term macro pos: String

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

scala>