  $ dune init project name $PWD 2>&1 | head -n 8
  Internal error, please report upstream including the contents of _build/log.
  Description:
    ("[as_in_source_tree_exn] called on something not in source tree",
    { t =
        External
          "$TESTCASE_ROOT"
    })
  Raised at Stdune__Code_error.raise in file
