DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
DECLARE_SCHEME_CALLBACK (pure_height, (SCM, SCM, SCM));
static Stencil raw_stencil (Grob *, Real slope, Direction stemdir);
DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
DECLARE_SCHEME_CALLBACK (pure_height, (SCM, SCM, SCM));
static Stencil raw_stencil (Grob *, Real slope, Direction stemdir);