Procedural Fascicle for R7RS Large Scheme

<p>Scheme Working Group 2 is pleased to announce the first draft of the second part of the R7RS-Large Foundations, the <strong>"Procedural Fascicle</strong>." This draft encompasses the familiar block programming forms, such as <code>lambda</code>, <code>let</code>, <code>if</code>, <code>or</code>, and <code>set!</code>.</p> <p>The draft is available here:</p> <p><a href="https://r7rs.org/large/fascicles/proc/" rel="ugc">https://r7rs.org/large/fascicles/proc/</a></p> <p>The biggest new feature is the ability to mix definitions and expressions in bodies, such as the body of a <code>lambda</code>. For example, the following is now valid:</p> <pre lang="scheme"><code>(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 '())) </code></pre> <p>We welcome any and all comments on the draft. Anyone can comment by:</p> <ul> <li>Filing an issue on the <a href="https://codeberg.org/scheme/r7rs" rel="ugc">R7RS-Large issue tracker</a> </li> <li>Sending mail to the <a href="https://groups.google.com/g/scheme-reports-wg2" rel="ugc">Working Group 2 mailing list</a> (you do not need a Google account)</li> <li>Sending mail to the <a href="https://scheme-reports.simplelists.com/" rel="ugc">Scheme Reports mailing list</a> at <a href="mailto:[email protected]" rel="ugc">[email protected]</a> </li> <li>Sending mail to the corresponding member Peter McGoron at <a href="mailto:[email protected]" rel="ugc">[email protected]</a>. He will forward your comment to the public issue tracker. Please indicate if you wish to be anonymous.</li> </ul> <p><a href="https://lobste.rs/s/yfpl8d/procedural_fascicle_for_r7rs_large">Comments</a></p>