t / t4013 / diff.diff_--cachedon commit merge-octopus: abort if index does not match HEAD (3ec62ad)
   1diff --git a/dir/sub b/dir/sub
   2new file mode 100644
   3index 0000000..992913c
   4--- /dev/null
   5+++ b/dir/sub
   6@@ -0,0 +1,8 @@
   7+A
   8+B
   9+C
  10+D
  11+E
  12+F
  13+1
  14+2
  15diff --git a/file0 b/file0
  16new file mode 100644
  17index 0000000..10a8a9f
  18--- /dev/null
  19+++ b/file0
  20@@ -0,0 +1,9 @@
  21+1
  22+2
  23+3
  24+4
  25+5
  26+6
  27+A
  28+B
  29+C
  30diff --git a/file1 b/file1
  31new file mode 100644
  32index 0000000..b1e6722
  33--- /dev/null
  34+++ b/file1
  35@@ -0,0 +1,3 @@
  36+A
  37+B
  38+C