rpscala86-hygiene.scala

Macros.scala

import language.experimental.macros

import scala.reflect.macros.Context

object Macros {
  def nonHygienicA(): Int = macro MacrosImpl.nonHygienicAImpl

  def hygienicA(): Int = macro MacrosImpl.hygienicAImpl
}

object MacrosImpl {
  val a = 15

  def nonHygienicAImpl(c: Context)(): c.Expr[Int] = {
    import c.universe._
    c.Expr[Int](Ident(newTermName("a")))
  }

  def hygienicAImpl(c: Context)(): c.Expr[Int] = {
    import c.universe._
    reify(a)
  }
}