design
Teaching LFE to Format Itself, Part 2: Someone Already Solved This
Looking for a principled way to decide layout, we found Racket's raco fmt and the 2023 paper beneath it — a provably optimal pretty-printer. It was exactly what we needed, with exactly one problem: it is slowest precisely on the S-expressions a Lisp formatter sees most.
oubiwann · June 30, 2026
