You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: return_enums.rs
    path of file: ./repos/pydantic-core/src/input
    
    the code of the file until where you have to start completion: use std::borrow::Cow;
use std::cmp::Ordering;
use std::ops::Rem;
use std::slice::Iter as SliceIter;
use std::str::FromStr;

use jiter::{JsonArray, JsonObject, JsonValue};
use num_bigint::BigInt;

use pyo3::exceptions::PyTypeError;
use pyo3::prelude::*;
use pyo3::types::iter::PyDictIterator;
use pyo3::types::{
    PyByteArray, PyBytes, PyDict, PyFloat, PyFrozenSet, PyIterator, PyList, PyMapping, PySequence, PySet, PyString,
    PyTuple,
};
use pyo3::{ffi, intern, PyNativeType};

#[cfg(not(PyPy))]
use pyo3::types::P
    
    fn incr(&mut self) -> ValResult<()> {
        if let Some(max_length) = self.max_length {
            self.current_length += 1;
            if self.current_length > max_length {
                return Err(ValError::new(
                    ErrorType::TooLong {
                        field_type: self.field_type.to_string(),
                        max_length,
                        actual_length: self.actual_length,
                        context: None,
                    },
                    self.input,
                ));
            }
        }
        Ok(())
    }