I would like to bring some attention to this flycheck support for ATS
by Mark Laws:
https://github.com/drvink/flycheck-ats2/blob/master/flycheck-ats2.elNo need to download it directly. Instead, you can use MELPA to readily install it.
I like it quite a bit. However, I often have to turn off flycheck because I do not want
be "bothered" all the time :)
Cheers!