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import scala.language.experimental.macros
import scala.reflect.macros.{BlackboxContext, WhiteboxContext}
object Impls {
def foo(c: BlackboxContext)(x: c.Expr[Int]) = x
def refToFoo(dummy: Int) = macro refToFoo_impl
def refToFoo_impl(c: WhiteboxContext)(dummy: c.Expr[Int]) = {
import c.universe._
val body = Select(Ident(TermName("Impls")), TermName("foo"))
val global = c.universe.asInstanceOf[scala.tools.nsc.Global]
global.analyzer.markMacroImplRef(body.asInstanceOf[global.Tree])
c.Expr[Int](body)
}
}
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