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post.scala

object MacroImplementation { 
    def apply(c: scala.reflect.macros.whitebox.Context)(treeToTransform: c.Tree): c.Tree = {
      import c.universe._
      
      val resultName = "_result_"
      val lineNum = treeToTransform.pos.line

      c.Expr {
        Function(List(),
          Block(
            List(
              ValDef(Modifiers(), TermName(resultName), TypeTree(), Apply(treeToTransform, List())),

              Apply(Ident(TermName("println")), List(Literal(Constant("Going to return")))),
              Apply(Ident(TermName("println")), List(Ident(TermName(resultName)))),
              Apply(Ident(TermName("println")), List(Literal(Constant("at line")))),
              Apply(Ident(TermName("println")), List(Literal(Constant(lineNum))))
            ),
            Ident(TermName(resultName))
          ))
      }.tree
    }
  }