Function guile_sys::scm_set_smob_mfpe

pub unsafe extern "C" fn scm_set_smob_mfpe(
    tc: c_long, 
    mark: Option<extern "C" fn(_: SCM) -> SCM>, 
    free: Option<extern "C" fn(_: SCM) -> size_t>, 
    print: Option<unsafe extern "C" fn(_: SCM, _: SCM, _: *mut scm_print_state) -> c_int>, 
    equalp: Option<extern "C" fn(_: SCM, _: SCM) -> SCM>
)