--- a/tests/test-rhg.t	Wed Sep 01 18:09:35 2021 +0200
+++ b/tests/test-rhg.t	Mon Sep 13 15:12:35 2021 +0200
@@ -370,3 +370,12 @@
   $ cat .hg/blackbox.log.1
   ????/??/?? ??:??:??.??? * @d3873e73d99ef67873dac33fbcc66268d5d2b6f4 (*)> (rust) files (glob)
 
+Subrepos are not supported
+
+  $ touch .hgsub
+  $ $NO_FALLBACK rhg files
+  unsupported feature: subrepos (.hgsub is present)
+  [252]
+  $ rhg files
+  a
+  $ rm .hgsub