diff -r 0906b85bf222 -r 778dc37ce683 contrib/check-py3-compat.py
--- a/contrib/check-py3-compat.py	Sun May 21 12:10:53 2017 -0700
+++ b/contrib/check-py3-compat.py	Sun May 21 13:44:26 2017 -0700
@@ -51,9 +51,10 @@
         return
 
     # Try to import the module.
-    # For now we only support mercurial.* and hgext.* modules because figuring
-    # out module paths for things not in a package can be confusing.
-    if f.startswith(('hgext/', 'mercurial/')) and not f.endswith('__init__.py'):
+    # For now we only support modules in packages because figuring out module
+    # paths for things not in a package can be confusing.
+    if (f.startswith(('hgdemandimport/', 'hgext/', 'mercurial/'))
+        and not f.endswith('__init__.py')):
         assert f.endswith('.py')
         name = f.replace('/', '.')[:-3]
         try: