Complete steps which allow someone else who does not have access to your environment to reproduce the bug.
$ arc land --keep-branch 27ce29a Usage Exception: Argument "--keep-branch" is unrecognized. Use "--" to indicate the end of flags. $ arc help land | grep -m1 -C1 keep-branch Any obsolete refs that point at commits which were published are deleted, unless the --keep-branch flag is passed.
Output from Config > Version Information or
$ arc version arcanist 92f860ae9b2fc0b2c50061f1f6bba6bf04af5f8c (11 Jun 2020)