From 43e6bc2f110dd4907e3bd98dac603f635ff0cf2b Mon Sep 17 00:00:00 2001
From: Jan Pochyla <jpochyla@gmail.com>
Date: Thu, 9 Jun 2016 16:33:19 +0200
Subject: [PATCH] raise on registering conflicting message handler

---
 src/trezor/dispatcher.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/trezor/dispatcher.py b/src/trezor/dispatcher.py
index a1381db4..966918fd 100644
--- a/src/trezor/dispatcher.py
+++ b/src/trezor/dispatcher.py
@@ -6,6 +6,8 @@ message_handlers = {}
 
 
 def register(mtype, handler):
+    if mtype in message_handlers:
+        raise Exception('Message wire type %s is already registered', mtype)
     message_handlers[mtype] = handler