File: Impls_1.scala

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import scala.reflect.macros.blackbox.Context

object Impls {
  def foo(c: Context)(x: c.Expr[Int]) = {
    import c.universe._
    val body = Apply(Select(x.tree, TermName("$plus")), List(Literal(Constant(1))))
    c.Expr[Int](body)
  }
}