I wrote a looping facility for guile scheme recently, which was somewhat inspired by common lisps other big looping macro Iterate: https://git.sr.ht/%7Ebjoli/go

I wrote a looping facility for guile scheme recently, which was somewhat inspired by common lisps other big looping macro Iterate: https://git.sr.ht/%7Ebjoli/goof-loop https://git.sr.ht/%7Ebjoli/goof-loop scroll down for examples. It is more limited than the one in common lisp, since it turns all loops into tail recursion and this uses no mutation outside the higher-order looping constructs. It is written mostly using the hygienic syntax-rules facility (yes, it actually works) and I haven't managed to get it to produce slow code yet.