(list 'unquote `(ly:make-moment
,(ly:moment-main-numerator e)
,(ly:moment-main-denominator e)
- . ,(if (eq? 0 (ly:moment-grace-numerator e))
+ . ,(if (zero? (ly:moment-grace-numerator e))
'()
(list (ly:moment-grace-numerator e)
(ly:moment-grace-denominator e))))))