<div dir="ltr">Hi Michal,<br><br>Just noting that perhaps <a href="https://hackage.haskell.org/package/validation">https://hackage.haskell.org/package/validation</a> or <a href="https://hackage.haskell.org/package/monad-validate">https://hackage.haskell.org/package/monad-validate</a> could also be of use for these purposes.<br><br>Cheers,<br><br>======<br>Georgi</div>