From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sat, 20 Jun 2020 12:17:36 +0000 (+0100)
Subject: avoid looking like a singleton pattern
X-Git-Tag: 24jan2021_ls180~6
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b061dc21b353a4ae0a4574e744a6b20cfa1926f5;p=nmigen-soc.git

avoid looking like a singleton pattern
---

diff --git a/nmigen_soc/wishbone/sram.py b/nmigen_soc/wishbone/sram.py
index 451f948..630b53c 100644
--- a/nmigen_soc/wishbone/sram.py
+++ b/nmigen_soc/wishbone/sram.py
@@ -46,7 +46,9 @@ class SRAM(Elaboratable):
     """
 
     def __init__(self, memory, read_only=False, bus=None,
-                 granularity=None, features=frozenset()):
+                 granularity=None, features=None):
+        if features is None:
+            features = frozenset()
         if not isinstance(memory, Memory):
             raise TypeError("Memory {!r} is not a Memory"
                             .format(memory))