DECLARE_SCHEME_CALLBACK (print, (SCM));
DECLARE_SCHEME_CALLBACK (broken_bound_padding, (SCM));
DECLARE_SCHEME_CALLBACK (pure_height, (SCM, SCM, SCM));
DECLARE_SCHEME_CALLBACK (print, (SCM));
DECLARE_SCHEME_CALLBACK (broken_bound_padding, (SCM));
DECLARE_SCHEME_CALLBACK (pure_height, (SCM, SCM, SCM));