From 96277473f53e165aaa3c546a5b5acafb38fac1bb Mon Sep 17 00:00:00 2001
From: nissy <nishida@ngc224.org>
Date: Tue, 3 Apr 2018 15:46:17 +0900
Subject: [PATCH] bugfix group

---
 group.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/group.go b/group.go
index e330508..e77129b 100644
--- a/group.go
+++ b/group.go
@@ -9,9 +9,11 @@ type Group struct {
 }
 
 func (g *Group) Group(pattern string, middlewares ...Middleware) *Group {
-	g.prefix += compensatePattern(pattern)
-	g.middlewares = append(g.middlewares, middlewares...)
-	return g
+	return &Group{
+		mux:         g.mux,
+		middlewares: append(g.middlewares, middlewares...),
+		prefix:      g.prefix + compensatePattern(pattern),
+	}
 }
 
 func (g *Group) Use(middlewares ...Middleware) {