On Fri, Jun 21, 2019 at 12:37:37PM +0000, PICCA Frederic-Emmanuel wrote: > Do you know if a version existe of readMaybe with Text instead of String VoilĂ https://hackage.haskell.org/package/readable-0.3.1/docs/Data-Readable.html Maybe is an instance of MonadPlus, so it should fit your bill