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import scala.language.experimental.macros
import scala.reflect.macros.whitebox.Context
trait Base
class Att extends Base
object Macros {
def impl(c: Context) = {
import c.universe._
import c.internal._
import decorators._
val dummy = q"x"
dummy.updateAttachment(new Att)
if (dummy.attachments.get[Base].isEmpty) c.abort(c.enclosingPosition, "that's not good")
q"()"
}
def foo: Any = macro impl
}
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