123   $ echo b >> b

   123   $ echo b >> b

   124   $ hg commit -m'change in unshared'

   124   $ hg commit -m'change in unshared'

   125   $ cd ../repo1

   125   $ cd ../repo1

   126   $ hg id -r tip

   126   $ hg id -r tip

   127   c2e0ac586386 tip

   127   c2e0ac586386 tip