pub unsafe extern "C" fn set_fieldtype_arg( arg1: *mut FIELDTYPE, make_arg: Option<unsafe extern "C" fn(arg1: *mut va_list) -> *mut c_void>, copy_arg: Option<unsafe extern "C" fn(arg1: *const c_void) -> *mut c_void>, free_arg: Option<unsafe extern "C" fn(arg1: *mut c_void)>) -> c_int