Procedural Fascicle, Draft #1

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 '()))

We welcome any and all comments on the draft. Anyone can comment by