From 070015e408db674a638ba70e3b194a6fbd564a4b Mon Sep 17 00:00:00 2001
From: Rapptz <rapptz@gmail.com>
Date: Fri, 18 Dec 2015 20:13:04 -0500
Subject: [PATCH] Disallow duplicates when adding or removing roles.

---
 discord/client.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/discord/client.py b/discord/client.py
index b5b822a90..5cf0ac132 100644
--- a/discord/client.py
+++ b/discord/client.py
@@ -2060,7 +2060,7 @@ class Client:
             Adding roles failed.
         """
 
-        new_roles = [role.id for role in itertools.chain(member.roles, roles)]
+        new_roles = {role.id for role in itertools.chain(member.roles, roles)}
         yield from self._replace_roles(member, *new_roles)
 
     @asyncio.coroutine
@@ -2121,7 +2121,7 @@ class Client:
             Removing roles failed.
         """
 
-        new_roles = [role.id for role in roles]
+        new_roles = {role.id for role in roles}
         yield from self._replace_roles(member, *new_roles)
 
     @asyncio.coroutine