diff --git a/_future/macros_test.go b/_future/macros_test.go
index 5634ba28..1b01f035 100644
--- a/_future/macros_test.go
+++ b/_future/macros_test.go
@@ -1,8 +1,19 @@
+// I would be grateful if I had the chance to see the whole work-in-progress in a codebase when I started.
+// You have the chance to learn faster nowdays, don't underestimate that, that's the only reason that this "_future" folder exists now.
+//
+// The whole "router" package is a temp place to test my ideas and implementations for future iris' features.
+// Young developers can understand and see how ideas can be transform to real implementations on a software like Iris,
+// watching the history of a "dirty" code can be useful for some of you.
+
 package router
 
 import (
 	"regexp"
 	"testing"
+
+	"gopkg.in/kataras/iris.v6"
+	"gopkg.in/kataras/iris.v6/adaptors/httprouter"
+	"gopkg.in/kataras/iris.v6/httptest"
 )
 
 // macros should be registered before .Listen
@@ -30,7 +41,7 @@ func fromRegexp(expr string) func(paramValue string) bool {
 
 // link the path tmpl with macros, at .Boot time, before Listen.
 // make it a as middleware from the beginning and prepend that before the main handler.
-func link(path string, m _macros) {
+func link(path string, mac _macros) iris.HandlerFunc {
 	tmpl, err := ParsePath(path)
 	if err != nil {
 		panic(err)
@@ -39,8 +50,45 @@ func link(path string, m _macros) {
 	// and return a new compiled macro or a list of iris handlers
 	// in order to be prepended on the original route or make a different function for that?
 	// we'll see.
-	_ = tmpl
 
+	var h iris.HandlerFunc // we could add an empty handler but we wouldn't know where to ctx.Next if this path doesn't uses macros.
+
+	createH := func(paramName string, validator func(string) bool, failStatus int, prevH iris.HandlerFunc) iris.HandlerFunc {
+		return func(ctx *iris.Context) {
+			if prevH != nil {
+				prevH(ctx)
+			}
+
+			paramValue := ctx.Param(paramName)
+			if paramValue != "" {
+				valid := validator(paramValue)
+				if !valid {
+					ctx.EmitError(failStatus)
+					return
+				}
+			}
+			// println(ctx.Pos)
+			// remember: router already matches the path, so here if a path param is missing then it was allowed by the router.
+			ctx.Next()
+		}
+	}
+
+	for i := range tmpl.Params {
+		p := tmpl.Params[i]
+		if m := mac[p.Param.Macro.Name]; m != nil {
+			prevH := h
+			h = createH(p.Param.Name, m, p.Param.FailStatusCode, prevH)
+		}
+	}
+
+	if h == nil {
+		// println("h is nil")
+		return func(ctx *iris.Context) {
+			ctx.Next() // is ok, the route doesn't contains any valid macros
+		}
+	}
+
+	return h
 }
 
 // eval runs while serving paths
@@ -57,19 +105,28 @@ func link(path string, m _macros) {
 // only for test-cases? and after on iris we can make a middleware from this, I should think it more when I stop the drinking.
 
 func testMacros(source string) error {
-	var m = _macros{
-		"id": fromRegexp("[1-9]+$"),
-	}
-
-	link(source, m)
-
-	// eval("/api/users/42", result)
-
 	return nil
 }
 
 func TestMacros(t *testing.T) {
-	if err := testMacros("/api/users/{id:int}/posts"); err != nil {
-		t.Fatal(err)
+	var m = _macros{
+		"int": fromRegexp("[1-9]+$"),
 	}
+	path := "/api/users/{id:int}/posts"
+	app := iris.New()
+	app.Adapt(httprouter.New())
+
+	hv := link(path, m)
+
+	app.Get("/api/users/:id/posts", hv, func(ctx *iris.Context) {
+		ctx.ResponseWriter.WriteString(ctx.Path())
+	})
+
+	e := httptest.New(app, t)
+
+	e.GET("/api/users/42/posts").Expect().Status(iris.StatusOK).Body().Equal("/api/users/42/posts")
+	e.GET("/api/users/0/posts").Expect().Status(iris.StatusNotFound)
+	e.GET("/api/users/_/posts").Expect().Status(iris.StatusNotFound)
+	e.GET("/api/users/s/posts").Expect().Status(iris.StatusNotFound)
+	e.GET("/api/users/posts").Expect().Status(iris.StatusNotFound)
 }
diff --git a/_future/param_parser.go b/_future/param_parser.go
index 49ed72c8..d2bc4e83 100644
--- a/_future/param_parser.go
+++ b/_future/param_parser.go
@@ -43,7 +43,7 @@ const (
 	ANDSymbol          = '&'
 )
 
-const DefaultFailStatusCode = 0
+const DefaultFailStatusCode = 404
 
 // Parse i.e:
 // id:int range(1,5) otherFunc(3) !404