203   $ hg fold --from 'desc("r4")' -U

   204   2 changesets folded

   205   0 files updated, 0 files merged, 0 files removed, 0 files unresolved

   206   $ hg log -G

   207   @  15 - 91880abed0f2 r4 [test] (draft)

   208   |

   209   | o  12 - b568edbee6e0 r8 [debugbuilddag] (draft)

   210   |/

   211   o  3 - 2dc09a01254d r3 [debugbuilddag] (draft)

   212   |

   213   o  2 - 01241442b3c2 r2 [debugbuilddag] (draft)

   214   |

   215   o  1 - 66f7d451a68b r1 [debugbuilddag] (draft)

   216   |

   217   o  0 - 1ea73414a91b r0 [debugbuilddag] (public)

   218