From 9d3fd50950a9166176d3ebaa88121ef3dcced857 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Thu, 17 Sep 2015 17:24:57 +0800
Subject: [PATCH] sim: variables are deprecated

---
 migen/sim.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/migen/sim.py b/migen/sim.py
index 37882d6ab..c6ddea55b 100644
--- a/migen/sim.py
+++ b/migen/sim.py
@@ -110,6 +110,7 @@ class Evaluator:
             raise NotImplementedError
 
     def assign(self, signal, value):
+        assert not signal.variable
         value = value & (2**signal.nbits - 1)
         if signal.signed and (value & 2**(signal.nbits - 1)):
             value -= 2**signal.nbits