Hi
I am not sure it is a bug, but with LilyPond 2.19.45 version
we have this error :
error: syntax error, unexpected SCM_TOKEN, expecting '='
\override Staff.LaissezVibrerTie #'details
#'note-head-gap = #(/ 1.5 -2)
get also an error here :
\override TextSpanner #'bound-details #'left #'text = \markup { \italic "m.d"
}
\override TextSpanner #'bound-details #'right #'text = \markup { \draw-line
#'(0 . 1) }
with this verssion 2.19.36 everything works fine.
I don't know if the #'arguments aren't no more supported with the latest
version (?).
best