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 <[email protected]> * Sending mail to the corresponding member Peter McGoron at <[email protected]>. I will forward your comment to the public issue tracker. Please indicate if you wish to be anonymous.