$ arc version --trace
 ARGV  "C:/Users/myuser/Desktop/arcanist/bin/../scripts/arcanist.php" "version" "--trace"
 LOAD  Loaded "phutil" from "C:\Users\myuser\Desktop\libphutil\src".
 LOAD  Loaded "arcanist" from "C:\Users\myuser\Desktop\arcanist\src".
Config: Reading user configuration file "C:\Users\myuser\AppData\Roaming/.arcrc"...
Config: Did not find system configuration at "C:\ProgramData\Phabricator/Arcanist/config".
Working Copy: Reading .arcconfig from "C:\Users\myuser\Desktop\myproject\myproject/.arcconfig".
Working Copy: Path "C:\Users\myuser\Desktop\myproject\myproject" is part of `git` working copy "C:\Users\myuser\Desktop\myproject\myproject".
Working Copy: Project root is at "C:\Users\myuser\Desktop\myproject\myproject".
Config: Did not find local configuration at "C:\Users\myuser\Desktop\myproject\myproject\.git\arc/config".
>>> [0] <exec> $ where "git"
<<< [0] <exec> 130,561 us
Working Copy: No candidate locations for .arcconfig from this working directory.
Working Copy: Path "C:\Users\myuser\Desktop\arcanist" is not in any working copy.

[2017-07-11 23:02:42] EXCEPTION: (Exception) The current working directory is not part of a working copy for a supported version control system (Git, Subversion or Mercurial). at [<arcanist>\src\repository\api\ArcanistRepositoryAPI.php:85]
arcanist(head=master, ref.master=165df12046e5), phutil(head=master, ref.master=0a4487d37cd7)
  #0 ArcanistRepositoryAPI::newAPIFromConfigurationManager(ArcanistConfigurationManager) called at [<arcanist>\src\workflow\ArcanistVersionWorkflow.php:47]
  #1 ArcanistVersionWorkflow::run() called at [<arcanist>\scripts\arcanist.php:394]

$ git status
On branch f_T5656
Your branch is ahead of 'master' by 1 commit.
  (use "git push" to publish your local commits)
nothing to commit, working tree clean