#StructuralType without #reflection using #annotation trick imagined by @xeno_by (Eugene Burmako) originally https://gist.github.com/xeno-by/5967900 compatible #quasiquote

__LICENSE.txt

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2013 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

Macros.scala

import scala.annotation.StaticAnnotation
import scala.reflect.macros.Macro
import language.experimental.macros
 
class body(tree: Any) extends StaticAnnotation
 
trait Macros extends Macro {
  import c.universe._
 
  def selFieldImpl = {
    val field = c.macroApplication.symbol
    val bodyAnn = field.annotations.filter(_.tpe <:< typeOf[body]).head
    bodyAnn.scalaArgs.head
  }
 
  def mkObjectImpl(xs: c.Tree*) = {
    val kvps = xs.toList map { case q"${_}(${Literal(Constant(name: String))}).->[${_}]($value)" => name -> value }
    val fields = kvps map { case (k, v) => q"@body($v) def ${TermName(k)} = macro Macros.selFieldImpl" }
    q"class Workaround { ..$fields }; new Workaround{}"
  }
}
 
object mkObject {
  def apply(xs: Any*) = macro Macros.mkObjectImpl
}

Test.scala

object Test {
  def main(args: Array[String]) = {
    val foo = mkObject("x" -> "2", "y" -> 3)
    println(foo.x)
    println(foo.y)
    // println(foo.z) => will result in a compilation error
  }
}