Yes, a different story. The idea is that attaching information on "stack frames" might be useful for other things than stack traces. The reference linked to is

Yes, a different story. The idea is that attaching information on "stack frames" might be useful for other things than stack traces. The reference linked to is precise, but do not show the utility. The rationale here gives a better quick introduction: > https://srfi.schemers.org/srfi-157/srfi-157.html https://srfi.schemers.org/srfi-157/srfi-157.html A more thorough treatment: https://www2.ccs.neu.edu/racket/pubs/dissertation-clements.pdf https://www2.ccs.neu.edu/racket/pubs/dissertation-clements.p...