From 76503a18194eb6da40645db9304826cbd9f9b947 Mon Sep 17 00:00:00 2001
From: whitequark <cz@m-labs.hk>
Date: Fri, 14 Dec 2018 19:08:06 +0000
Subject: [PATCH] back.pysim: fix implicit boolean conversion.

---
 nmigen/back/pysim.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nmigen/back/pysim.py b/nmigen/back/pysim.py
index 47d84fa..db4a678 100644
--- a/nmigen/back/pysim.py
+++ b/nmigen/back/pysim.py
@@ -53,7 +53,7 @@ class _RHSValueCompiler(ValueTransformer):
         return lambda state: value.value
 
     def on_Signal(self, value):
-        if self.sensitivity:
+        if self.sensitivity is not None:
             self.sensitivity.add(value)
         if self.signal_mode == "curr":
             return lambda state: state.curr[value]
-- 
2.30.2