import scala.reflect.makro.Context

object Macros {
  def foo(c: Context) = {
    import c.mirror._
    val ids = collection.mutable.ListBuffer[Ident]()
    //val expr =
    //  Apply(
    //    Select(
    //      Literal(Constant("hey")),
    //      newTermName("format")),
    //    List(ids: _* )
    //  )
    val expr = c.reify("hey".format((ids.map(id => Expr(id).eval)) : _*))
    expr
  }
}

C:\Projects\Kepler\sandbox @ master>myke compile Test.scala
Test.scala:14: error: exception during macro expansion:
scala.MatchError: (ids.map[Nothing, scala.collection.mutable.ListBuffer[Nothing]](((id: c.mirror.Ident) => c.mirror.Expr.apply[Nothing](id)(c.mirror.TypeTag.Nothing).eval))(mutable.this.ListBuffer.canBuildFrom[Nothing]): _*) (of class sc
ala.reflect.api.Trees$Typed)
        at scala.reflect.reify.phases.Reshape$$anon$1.toPreTyperTypedOrAnnotated(Reshape.scala:157)
        at scala.reflect.reify.phases.Reshape$$anon$1.transform(Reshape.scala:35)
        at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:1549)
        at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:1549)
        at scala.collection.immutable.List.loop$1(List.scala:163)
        at scala.collection.immutable.List.mapConserve(List.scala:179)
        at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:1549)
        at scala.reflect.api.Trees$Transformer.transform(Trees.scala:1513)
        at scala.reflect.reify.phases.Reshape$$anon$1.transform(Reshape.scala:85)
        at scala.reflect.reify.Phases$$anonfun$mkReificationPipeline$1.apply(Phases.scala:28)
        at scala.reflect.reify.Phases$$anonfun$mkReificationPipeline$1.apply(Phases.scala:18)
        at scala.reflect.reify.Reifier.liftedTree1$1(Reifier.scala:61)
        at scala.reflect.reify.Reifier.reified(Reifier.scala:47)
        at scala.reflect.reify.package$.reifyTree(package.scala:26)
        at scala.reflect.makro.runtime.Reifiers$class.reifyTree(Reifiers.scala:18)
        at scala.reflect.makro.runtime.Context.reifyTree(Context.scala:6)
        at scala.reflect.makro.internal.Utils$$anonfun$2.apply(Utils.scala:117)
        at scala.reflect.makro.internal.Utils$$anonfun$2.apply(Utils.scala:117)
        at scala.reflect.makro.internal.Utils.translatingReificationErrors(Utils.scala:123)
        at scala.reflect.makro.internal.Utils.materializeExpr(Utils.scala:117)
        at scala.reflect.makro.Context$.reify(Context.scala:42)

    val expr = c.reify("hey".format((ids.map(id => Expr(id).eval)) : _*))
                      ^
one error found