git-rebase-preserve-merges-bug.sh

mkdir test
cd test
git init .
echo X > X
git add X
git ci -m "First"
git branch first
echo Y > X
git add X
git ci -m "Second"
git co first

git rebase master --preserve-merges
# Nothing to do

git rebase master
# First, rewinding head to replay your work on top of it...
# Fast-forwarded first to master.