From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 27 Sep 2021 16:54:15 +0000 (+0100)
Subject: add useful debug statement for when domains already exist
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1624635227b8d7e6621099634b90d1cf8b6b1b54;p=nmigen.git

add useful debug statement for when domains already exist
---

diff --git a/nmigen/hdl/ir.py b/nmigen/hdl/ir.py
index 3c1ec60..5a167f9 100644
--- a/nmigen/hdl/ir.py
+++ b/nmigen/hdl/ir.py
@@ -112,7 +112,8 @@ class Fragment:
     def add_domains(self, *domains):
         for domain in flatten(domains):
             assert isinstance(domain, ClockDomain)
-            assert domain.name not in self.domains
+            assert domain.name not in self.domains, \
+            "domain.name %s already in %s" % (domain.name, repr(self.domains))
             self.domains[domain.name] = domain
 
     def iter_domains(self):