t / t4101 / diff.1-2on commit unpack_trees: fix breakage when o->src_index != o->dst_index (7db1183)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,3 +1,2 @@
   4 a
   5-b
   6-c
   7+b
   8\ No newline at end of file