--- a/tests/test-clone.t	Mon Mar 24 21:27:40 2014 -0400
+++ b/tests/test-clone.t	Tue Mar 25 19:34:17 2014 +0900
@@ -621,3 +621,17 @@
 #endif
 
   $ cd ..
+
+Test clone from the repository in (emulated) revlog format 0 (issue4203):
+
+  $ mkdir issue4203
+  $ mkdir -p src/.hg
+  $ echo foo > src/foo
+  $ hg -R src add src/foo
+  $ hg -R src commit -m '#0'
+  $ hg -R src log -q
+  0:e1bab28bca43
+  $ hg clone -U -q src dst
+  $ hg -R dst log -q
+  0:e1bab28bca43
+  $ cd ..