@ instance doesn't create by-name param

[DmytroMitin]

https://github.com/DmytroMitin/AUXify/blob/master/core/src/test/scala/com/github/dmytromitin/InstanceMonoidTest.scala

Warning:scalac: {
  abstract trait Monoid[A] extends scala.AnyRef {
    def empty: A;
    def combine(a: A, a1: A): A
  };
  object Monoid extends scala.AnyRef {
    def <init>() = {
      super.<init>();
      ()
    };
    def instance[A](f$macro$1: A, f$macro$2: _root_.scala.Function2[A, A, A]): Monoid[A] = {
      final class $anon extends Monoid[A] {
        def <init>() = {
          super.<init>();
          ()
        };
        override def empty: A = f$macro$1;
        override def combine(a: A, a1: A): A = f$macro$2(a, a1)
      };
      new $anon()
    };
    implicit val int: Monoid[Int] = instance(0, ((x$1, x$2) => x$1.$plus(x$2)));
    implicit val str: Monoid[String] = instance("", ((x$3, x$4) => x$3.$plus(x$4)))
  };
  ()
}
Block(List(ClassDef(Modifiers(ABSTRACT | INTERFACE | DEFAULTPARAM/TRAIT), TypeName("Monoid"), List(TypeDef(Modifiers(PARAM), TypeName("A"), List(), TypeBoundsTree(EmptyTree, EmptyTree))), Template(List(Select(Ident(scala), TypeName("AnyRef"))), noSelfType, List(DefDef(Modifiers(DEFERRED), TermName("empty"), List(), List(), Ident(TypeName("A")), EmptyTree), DefDef(Modifiers(DEFERRED), TermName("combine"), List(), List(List(ValDef(Modifiers(PARAM), TermName("a"), Ident(TypeName("A")), EmptyTree), ValDef(Modifiers(PARAM), TermName("a1"), Ident(TypeName("A")), EmptyTree))), Ident(TypeName("A")), EmptyTree)))), ModuleDef(Modifiers(), TermName("Monoid"), Template(List(Select(Ident(scala), TypeName("AnyRef"))), noSelfType, List(DefDef(Modifiers(), termNames.CONSTRUCTOR, List(), List(List()), TypeTree(), Block(List(pendingSuperCall), Literal(Constant(())))), DefDef(Modifiers(), TermName("instance"), List(TypeDef(Modifiers(PARAM), TypeName("A"), List(), TypeBoundsTree(EmptyTree, EmptyTree))), List(List(ValDef(Modifiers(PARAM), TermName("f$macro$1"), Ident(TypeName("A")), EmptyTree), ValDef(Modifiers(PARAM), TermName("f$macro$2"), AppliedTypeTree(Select(Select(Ident(termNames.ROOTPKG), scala), TypeName("Function2")), List(Ident(TypeName("A")), Ident(TypeName("A")), Ident(TypeName("A")))), EmptyTree))), CompoundTypeTree(Template(List(AppliedTypeTree(Ident(TypeName("Monoid")), List(Ident(TypeName("A"))))), noSelfType, List())), Block(List(ClassDef(Modifiers(FINAL), TypeName("$anon"), List(), Template(List(AppliedTypeTree(Ident(TypeName("Monoid")), List(Ident(TypeName("A"))))), noSelfType, List(DefDef(Modifiers(), termNames.CONSTRUCTOR, List(), List(List()), TypeTree(), Block(List(pendingSuperCall), Literal(Constant(())))), DefDef(Modifiers(OVERRIDE), TermName("empty"), List(), List(), Ident(TypeName("A")), Ident(TermName("f$macro$1"))), DefDef(Modifiers(OVERRIDE), TermName("combine"), List(), List(List(ValDef(Modifiers(PARAM), TermName("a"), Ident(TypeName("A")), EmptyTree), ValDef(Modifiers(PARAM), TermName("a1"), Ident(TypeName("A")), EmptyTree))), Ident(TypeName("A")), Apply(Ident(TermName("f$macro$2")), List(Ident(TermName("a")), Ident(TermName("a1"))))))))), Apply(Select(New(Ident(TypeName("$anon"))), termNames.CONSTRUCTOR), List()))), ValDef(Modifiers(IMPLICIT), TermName("int"), AppliedTypeTree(Ident(TypeName("Monoid")), List(Ident(TypeName("Int")))), Apply(Ident(TermName("instance")), List(Literal(Constant(0)), Function(List(ValDef(Modifiers(PARAM | SYNTHETIC), TermName("x$1"), TypeTree(), EmptyTree), ValDef(Modifiers(PARAM | SYNTHETIC), TermName("x$2"), TypeTree(), EmptyTree)), Apply(Select(Ident(TermName("x$1")), TermName("$plus")), List(Ident(TermName("x$2")))))))), ValDef(Modifiers(IMPLICIT), TermName("str"), AppliedTypeTree(Ident(TypeName("Monoid")), List(Ident(TypeName("String")))), Apply(Ident(TermName("instance")), List(Literal(Constant("")), Function(List(ValDef(Modifiers(PARAM | SYNTHETIC), TermName("x$3"), TypeTree(), EmptyTree), ValDef(Modifiers(PARAM | SYNTHETIC), TermName("x$4"), TypeTree(), EmptyTree)), Apply(Select(Ident(TermName("x$3")), TermName("$plus")), List(Ident(TermName("x$4")))))))))))), Literal(Constant(())))