NOTE: Ensure latest Arcanist version is installed by running `arc upgrade`.
# run `arc lint` or `arc lint --cl` and see that no errors are displayed
# make some changes in `Default` or other changelist that would violate coding standards (e.g. inline comment starts with small letter)
# run `arc lint` or `arc lint --cl` and see that errors are displayed
# run `arc diff` or `arc diff --cl`, which should trigger `arc lint` internally and same errors/no errors should be displayed
# keep in mind, that only errors on changed lines in a file are displayed