Version 1.22 got new Asst/PAsst types (see #441) which presumably broke hindent build which depended on haskell-src-exts >= 1.20 (https://github.com/chrisdone/hindent/issues/562).

If these types are part of the public contract, I think it'd good to specify this change in CHANGELOG.