> David A. Wheeler scripsit: > > I like this idea. In a few places this patch changes return values > > to intentionally return (values)... which is also okay by me.
On Sun, 17 Nov 2013 20:33:16 -0500, John Cowan <co...@mercury.ccil.org> wrote: > For the record, I've never been a fan of returning zero values when you > have nothing in particular to return. R6RS and R7RS authorize returning > multiple values where the continuation ignores the values, but R5RS > does not, and indeed SCM, SigScheme, Shoe, and Owl Lisp do not permit > it: they throw errors to `(begin (values) 3)` and `(begin (values 1 2) > 3)`, rather than returning 3 as other R5RS systems do. Yeeeeeccccchhhh. That is just mistaken, erroneous, fallacious, ill-judged, and in a thousand other ways wrong. It may be standards-compliant, but still wrong. That is really awful, I would never have guessed that. Since the return value CAN'T matter, it SHOULD NOT matter!!! Thanks for letting us know - that would clearly impact portability. > In my own code, > I always return the value of `(if #f #f)`, which is typically a Scheme's > undefined-value value. Yes, but if that gets back to the REPL it may do something funny. By definition that is undefined. > But I can live with it. Yes, but I want to make this *more* portable not *less*. Maybe we should define our own "no-value" value, and use a macro to define it. Then it can be defined as (values) or (if #f #f) or whatever for the various Schemes. I prefer (values) since that cannot harm a REPL, but only when the Scheme won't blow up while using it. I wonder what a good name would be for "no useful value". (void)? --- David A. Wheeler ------------------------------------------------------------------------------ DreamFactory - Open Source REST & JSON Services for HTML5 & Native Apps OAuth, Users, Roles, SQL, NoSQL, BLOB Storage and External API Access Free app hosting. Or install the open source package on any LAMP server. Sign up and see examples for AngularJS, jQuery, Sencha Touch and Native! http://pubads.g.doubleclick.net/gampad/clk?id=63469471&iu=/4140/ostg.clktrk _______________________________________________ Readable-discuss mailing list Readable-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/readable-discuss
