[scanner] Clarify exception message

1 files changed, 1 insertions, 1 deletions

diff --git a/giscanner/ast.py b/giscanner/ast.py
index 551dbb15..b03d43f9 100644
--- a/giscanner/ast.py
+++ b/giscanner/ast.py
@@ -352,7 +352,7 @@ returned."""
         previous = self._names.get(node.name)
         if previous is not None:
             if not replace:
-                raise ValueError("Namespace conflict")
+                raise ValueError("Namespace conflict: %r" % (node, ))
             self.remove(previous)
         # A layering violation...but oh well.
         from .glibast import GLibBoxed