From 710a8d0bc1537495a4d7b0f476db8901eaab853a Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Mon, 8 Jul 2019 09:33:01 +0000
Subject: [PATCH] back.rtlil: ignore empty source locations.

This was a bug introduced during refactoring in 2492f490.
---
 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 fc3bf1c..8c042c6 100644
--- a/nmigen/back/rtlil.py
+++ b/nmigen/back/rtlil.py
@@ -66,7 +66,7 @@ class _AttrBuilder:
     def _attributes(self, attrs, *, src=None, **kwargs):
         for name, value in attrs.items():
             self._attribute(name, value, **kwargs)
-        if src is not None:
+        if src:
             self._attribute("src", src, **kwargs)
 
 
-- 
2.30.2