A little debugging found the culprit, you cannot open read-only files with proselint, even if proselint doesn't need to (nor should) edit the files.
I will make a patch for this, and I have reported it upstream to get it fixed [1]. Cheers, [1]: https://github.com/amperser/proselint/issues/502 -- Víctor Cuadrado Juan m...@viccuad.me PGP key ID: 4096R: 0xA2591E231E251F36 Key fingerprint: E3C5 114C 0C5B 4C49 BA03 0991 A259 1E23 1E25 1F36 My signed E-Mails are trustworthy.
