R7RS includes "datum labels" (see section 2.4), e.g., #0=(a b c . #0#).
Sweet-expressions don't currently say anything specific about them. What, if anything, should we do about datum labels? In particular, should we provided a syntax to describe them for indentation processing, and if so, what would it be?!? The "easy" way to deal with them is to not provide any particular syntax for them at sweet-expression level, and presume that if they're supported, they're supported at the n-expression level. None of our implementations support datum labels either, though obviously that could be added. If we're to support them directly in sweet-expressions, I guess we support something like this: #0= ! a b c . #0# It's not clear at all that these are common enough to need the complexity - and it would be complexity! - in sweet-expression processing. However, generality is valuable. --- David A. Wheeler ------------------------------------------------------------------------------ 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
