pub unsafe extern "C" fn readstat_variable_add_missing_string_value(
variable: *mut readstat_variable_t,
value: *const c_char,
) -> readstat_error_tpub unsafe extern "C" fn readstat_variable_add_missing_string_value(
variable: *mut readstat_variable_t,
value: *const c_char,
) -> readstat_error_t