David A. Wheeler scripsit: > In systems that implement SRFI-88, a sequence of text ending in ":" is a > keyword and NOT a symbol. Interestingly enough, there's an exception - > a ":" by itself continues to be a symbol. It appears that there are > 5 Scheme implementations that implement SRFI-88
To wit, Chicken, Guile, Kawa, STklos, Scheme 7. Guile 2.0 only supports the safe #:foo format, at least by default. Chicken and Kawa support the #:foo and foo: formats, but not the Common Lisp :foo format, which produces identifiers, again by default. Scheme 7 supports all three formats. STklos supports foo: and :foo but not #:foo, and furthermore treats : as a keyword too. > So it seems that ":" *could* be used for SUBLIST in Scheme. I still > worry about problems using it with other Lisps. It could, but it is a standard identifier, and as you say, single-symbol ASCII identifiers that aren't already in use are rather rare. > The data we have so far suggests to me that "$" is slightly better than > ":". The ":" is used more than "$" as an operator in Emacs Lisp, and > "$" is the standard name in Haskell. But it's no slam-dunk case. > Are there other reasons (or amplifications of them) to prefer "$", > ":", or some other sequence of characters? Perhaps "$$" would be better, and would certainly fit well with "\\". But I am not proposing it at this stage. -- All Gaul is divided into three parts: the part John Cowan that cooks with lard and goose fat, the part http://ccil.org/~cowan that cooks with olive oil, and the part that co...@ccil.org cooks with butter. --David Chessler ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122912 _______________________________________________ Readable-discuss mailing list Readable-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/readable-discuss
