On Fri, 2015-03-06 at 08:25 +0100, Urs Liska wrote: > I find > > %% switch on debugging. > #(if (and #t (defined? 'set-debug-cell-accesses!)) > (set-debug-cell-accesses! 5000)) > > (found in init.ly) > > strange. > Wouldn't it be better ot simply remove the 'and' construct? > #t evaluates to #t always, isn't it?
The terminology used in the manual is "#t evaluates to true". (And, indeed #f is the only thing that evaluates to false). I think I then found it tricky to find where in the manual this concept (true/false) was explained, but came to understand it applies to the semantics of "if" and "while". > > Or is this one more Scheme subtlety I don't get? so, I don't think so - the commonest cause is where someone starts with (if (and Debug (defined? 'xxx)) and then decides not to have a separate Debug flag and replaces it in bulk with #t Richard _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
