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: types.rs
    path of file: ./repos/avro/lang/rust/avro/src
    
    the code of the file until where you have to start completion: // Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

//! Logic handling the intermediate representation of Avro values.
use crate::{
    bigdecimal::{deserialize_big_decimal, serialize_big_decimal},
    decimal::Decimal,
    duration::Duration,
    schema::{
        DecimalSchema, EnumSchema, FixedSchema, Name, Namespace, Precision, RecordField,
        RecordSchema, ResolvedSchema, Scale, Schema, SchemaKind, UnionSchema,
    },
    AvroResult, Error,
};
use bigdecimal::BigDecimal;
use serde_json::{Number, Value as JsonValue};
use std::{
    borrow::Borrow,
    collections::{BTreeMap, HashMap},
    fmt::Debug,
    hash::BuildHasher,
    str::FromStr,
};
use uuid::Uuid;

/// Compute the maximum decimal value precision of a byte array of length `len` could hold.
fn max_prec_for_len(len: usize) -> Result<usize, Error> {
    let len = i32:
    
    fn avro_3674_with_or_without_namespace(with_namespace: bool) -> TestResult {
        use crate::ser::Serializer;
        use serde::Serialize;

        let schema_str = r#"{
            "type": "record",
            "name": "NamespacedMessage",
            [NAMESPACE]
            "fields": [
                {
                    "type": "record",
                    "name": "field_a",
                    "fields": [
                        {
                            "name": "enum_a",
                            "type": {
                                "type": "enum",
                                "name": "EnumType",
                                "symbols": [
                                    "SYMBOL_1",
                                    "SYMBOL_2"
                                ],
                                "default": "SYMBOL_1"
                            }
                        },
                        {
                            "name": "enum_b",
                            "type": "EnumType"
                        }
                    ]
                }
            ]
        }"#;
        let schema_str = schema_str.replace(
            "[NAMESPACE]",
            if with_namespace {
                r#""namespace": "com.domain","#
            } else {
                ""
            },
        );

        let schema = Schema::parse_str(&schema_str)?;

        #[derive(Serialize)]
        enum EnumType {
            #[serde(rename = "SYMBOL_1")]
            Symbol1,
            #[serde(rename = "SYMBOL_2")]
            Symbol2,
        }

        #[derive(Serialize)]
        struct FieldA {
            enum_a: EnumType,
            enum_b: EnumType,
        }

        #[derive(Serialize)]
        struct NamespacedMessage {
            field_a: FieldA,
        }

        let msg = NamespacedMessage {
            field_a: FieldA {
                enum_a: EnumType::Symbol2,
                enum_b: EnumType::Symbol1,
            },
        };

        let mut ser = Serializer::default();
        let test_value: Value = msg.serialize(&mut ser)?;
        assert!(test_value.validate(&schema), "test_value should validate");
        assert!(
            test_value.resolve(&schema).is_ok(),
            "test_value should resolve"
        );

        Ok(())
    }