From 859c2dbcf096b17a82fc0d4dc766608165cf86e0 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Thu, 13 Dec 2018 11:30:16 +0000
Subject: [PATCH] back.rtlil: never give subfragment cells names starting with
 $.

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

diff --git a/nmigen/back/rtlil.py b/nmigen/back/rtlil.py
index 93e2d40..311a053 100644
--- a/nmigen/back/rtlil.py
+++ b/nmigen/back/rtlil.py
@@ -397,7 +397,7 @@ class _ValueTransformer(xfrm.ValueTransformer):
 
 
 def convert_fragment(builder, fragment, name, top):
-    with builder.module(name, attrs={"top": 1} if top else {}) as module:
+    with builder.module(name or "anonymous", attrs={"top": 1} if top else {}) as module:
         xformer = _ValueTransformer(module)
 
         # Register all signals driven in the current fragment. This must be done first, as it
-- 
2.30.2