From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Sun, 11 Dec 2011 19:17:29 +0000 (+0100)
Subject: fhdl: fix list references (thanks Lars)
X-Git-Tag: 24jan2021_ls180~2099^2~1144
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=dafef5d744f3f13ac0a15eae3f0f9913cffad53e;p=litex.git

fhdl: fix list references (thanks Lars)
---

diff --git a/migen/fhdl/structure.py b/migen/fhdl/structure.py
index f531ff3e..b5a87f2c 100644
--- a/migen/fhdl/structure.py
+++ b/migen/fhdl/structure.py
@@ -147,7 +147,8 @@ class Assign:
 		self.r = _cst(r)
 
 class StatementList:
-	def __init__(self, l=[]):
+	def __init__(self, l=None):
+		if l is None: l = []
 		self.l = l
 
 def _sl(x):
@@ -194,7 +195,10 @@ class Instance:
 		return id(self)
 
 class Fragment:
-	def __init__(self, comb=[], sync=[], instances=[], pads=set()):
+	def __init__(self, comb=None, sync=None, instances=None, pads=set()):
+		if comb is None: comb = []
+		if sync is None: sync = []
+		if instances is None: instances = []
 		self.comb = _sl(comb)
 		self.sync = _sl(sync)
 		self.instances = instances