Not really, it's more that I regularly make typos in all forms of writing (even handwritten). It's not usually misspellings but rather whole lexemes that go missing or are swapped.

fwiw, I TA a course taught (partially) in OCaml and work regularly with a large OCaml project as part of my thesis.

Parser generator errors are just a personal pet peeve of mine, I grew up with (mega)parsec (Haskell), where decent errors are out-of-the-box and great ones are easy.