Working Group 2 is pleased to announce the first draft of the second part of the R7RS-Large Foundations, the "Procedural Fascicle". This draft encompasses the familiar block programming forms, such as lambda, let, if, or, and set!.
The draft is available here:
https://r7rs.org/large/fascicles/proc/
The biggest new feature is the ability to mix definitions and expressions in bodies, such as the body of a lambda. For example, the following is now valid:
(define (map f lst)
(unless (list? lst)
(error 'map "not a list" lst))
(define (map* lst acc)
(if (null? lst)
(reverse acc)
(map* (cdr lst) (cons (f (car lst)) acc))))
(map* lst '()))
* Filing an issue on the R7RS-Large issue tracker <https://codeberg.org/scheme/r7rs> * Sending mail to the Working Group 2 mailing list <https://groups.google.com/g/scheme-reports-wg2> (you do not need a google account) * Sending mail to the Scheme Reports mailing list <https://scheme-reports.simplelists.com/> and <scheme-reports@scheme-reports.org> * Sending mail to the corresponding member Peter McGoron at <code@mcgoron.com>. I will forward your comment to the public issue tracker. Please indicate if you wish to be anonymous.
Looks like Rust. It helps macros a lot