From c4efd2ddacf45fa10e414def41e2cc9c7b24a9b8 Mon Sep 17 00:00:00 2001
From: whitequark <cz@m-labs.hk>
Date: Wed, 26 Jun 2019 05:22:09 +0000
Subject: [PATCH] back.pysim: fix scope screwup.

---
 nmigen/back/pysim.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nmigen/back/pysim.py b/nmigen/back/pysim.py
index c07677f..42f9954 100644
--- a/nmigen/back/pysim.py
+++ b/nmigen/back/pysim.py
@@ -329,7 +329,9 @@ class _StatementCompiler(StatementVisitor):
                     mask  = "1" * len(value)
                 mask  = int(mask,  2)
                 value = int(value, 2)
-                check = lambda test: test & mask == value
+                def make_check(mask, value):
+                    return lambda test: test & mask == value
+                check = make_check(mask, value)
             cases.append((check, self.on_statements(stmts)))
         def run(state):
             test_value = test(state)
-- 
2.30.2