DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
DECLARE_SCHEME_CALLBACK (calc_control_points, (SCM));
static bool less (Grob *const &s1,
DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
DECLARE_SCHEME_CALLBACK (calc_control_points, (SCM));
static bool less (Grob *const &s1,