'rm -f .git/index F16 &&
echo F16 >F16 &&
git update-index --add F16 &&
- tree0=`git write-tree` &&
+ tree0=$(git write-tree) &&
echo E16 >F16 &&
git update-index F16 &&
- tree1=`git write-tree` &&
+ tree1=$(git write-tree) &&
read_tree_must_succeed -m $tree0 $tree1 $tree1 $tree0 &&
git ls-files --stage'