t / t4135 / git-plain.diffon commit ls-files -k: a directory only can be killed if the index has a non-directory (2eac2a4)
   1diff --git a/postimage.txt b/postimage.txt
   2new file mode 100644
   3index 0000000..eff0c54
   4--- /dev/null
   5+++ b/postimage.txt
   6@@ -0,0 +1 @@
   7+postimage