On Tue, Aug 28, 2018 at 3:01 AM Mark H Weaver <[email protected]> wrote:
> In RnRS, (define a (if #f #f)) is allowed and guaranteed to assign > *some* object to 'a' without signalling an error. Actually, the phrase used is "the result is unspecified", which unfortunately is not defined in any RnRS. Racket produces a syntax error in this situation at least in its default language. > However, it's not > specified what object will be assigned. It could be 2 or (foo bar) or > "the cow jumps over the moon". > In practice, it is #t, #f, (), or a unique unspecified object across all the Schemes I have tested, most often the last. -- John Cowan http://vrici.lojban.org/~cowan [email protected] LEAR: Dost thou call me fool, boy? FOOL: All thy other titles thou hast given away: That thou wast born with.
