On Thu, May 19, 2011 at 8:55 AM, Andy Wingo <[email protected]> wrote: > Section 4.2.1, p. 11, in the spec of `and': > > "The TEST expressions are evaluated from left to right, and the value > of the first expression that evaluates to a false value (see section > 6.3.1) is returned. Any remaining expressions are not evaluated. If > all the expressions evaluate to true values, the value of the last > expression is returned..." > > Why these weasel words? Is this to somehow permit implementations with > more than one false value to return a false value from `and' which is > not #f ?
Good point, that's possibly wording left over from R4RS, where #f and '() were not necessarily distinct. #f and '() could be distinct and yet there could be other false values (as in Guile, no?), but I'm not sure if we need to word the standard to accomodate such extensions. -- Alex _______________________________________________ Scheme-reports mailing list [email protected] http://lists.scheme-reports.org/cgi-bin/mailman/listinfo/scheme-reports
