(positioning-done . ,ly:stem::calc-positioning-done)
(stem-info . ,ly:stem::calc-stem-info)
(stem-begin-position . ,(ly:make-unpure-pure-container ly:stem::calc-stem-begin-position ly:stem::pure-calc-stem-begin-position))
(positioning-done . ,ly:stem::calc-positioning-done)
(stem-info . ,ly:stem::calc-stem-info)
(stem-begin-position . ,(ly:make-unpure-pure-container ly:stem::calc-stem-begin-position ly:stem::pure-calc-stem-begin-position))