--- a/tests/test-rebase-inmemory.t	Mon Dec 03 20:59:48 2018 -0500
+++ b/tests/test-rebase-inmemory.t	Mon Dec 03 11:11:34 2018 -0800
@@ -239,6 +239,16 @@
   |/
   o  0: b173517d0057 'a'
   
+  $ mkdir c
+  $ echo c > c/c
+  $ hg add c/c
+  $ hg ci -m 'c/c'
+BROKEN: This should be a conflict, should not crash
+  $ hg rebase -r . -d 3 -n 2>&1 | grep KeyError
+  KeyError: 'c'
+BROKEN: This should be a conflict, should not crash
+  $ hg rebase -r 3 -d . -n 2>&1 | grep KeyError
+  KeyError: 'c/c'
 
   $ cd ..