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: conformance_tests.rs
    path of file: ./repos/rust-unic/unic/ucd/normal/tests
    
    the code of the file until where you have to start completion: // Copyright 2017 The UNIC Project Developers.
//
// See the COPYRIGHT file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[macro_use]
extern crate unic_char_range;

use std::collections::HashSet as Set;
use std::{char, u32};
use unic_ucd_normal::DecompositionType as DT;

const DT_TEST_DATA: &str =
    include_str!("../../../../external/unicode/ucd/data/extracted/DerivedDecompositionType.txt");

#[derive(Debug)]
struct Fail {
    pub line_num: Option<usize>,
    pub ch: char,
    pub exp_dt: Option<DT>,
    pub actual_dt: Option<DT>,
}

#[test]
fn test_decomposition_type_conformance() {
    let mut passed_num: u32 = 0;
    let mut failures: Vec<Fail> = Vec::new();
    let mut to_consider: Set<char> = chars!(..).iter().collect();

    for (line_idx, line) in DT_TEST_DATA.lines().enumerate() {
        // Remove comments and trailing whitespace
        let line = if let Some(idx) = line.find('#') {
            &line[0..idx]
        } else {
            line
        }
        .trim();

        // Ignore empty lines
        if line.is_empty() {
            continue;
        }

        // State setting lines
        if line.starts_with('@') {
            panic!("State setting line in DecompositionTypeTest.txt; expected none");
        }

        // Data lines
        {
            let fields: Vec<_> = line.split(';').map(str::trim).collect();
            let input_range = {
                let range_text = fields[0];
                let mut range = range_text.split("..");
                let low = u32::from_str_radix(range.next().unwrap(), 16).unwrap();
                let high = range
                    .next()
                    .map(|c| u32::from_str_radix(c, 16).unwrap())
                    .unwrap_or(low);
                low..(high + 1)
            };
            let exp_dt = Some(fields[1].parse().expect("Invalid Decomposition Type"));

            for codepoint in input_range {
                if let Some(ch) = char::from_u32(codepoint) {
                    let actual_dt = DT::of(ch);
                    if actual_dt != exp_dt {
                        failures.push(Fail {
                            line_num: Some(line_idx + 1),
        
    
fn test_decomposition_type_conformance() {
    let mut passed_num: u32 = 0;
    let mut failures: Vec<Fail> = Vec::new();
    let mut to_consider: Set<char> = chars!(..).iter().collect();

    for (line_idx, line) in DT_TEST_DATA.lines().enumerate() {
        // Remove comments and trailing whitespace
        let line = if let Some(idx) = line.find('#') {
            &line[0..idx]
        } else {
            line
        }
        .trim();

        // Ignore empty lines
        if line.is_empty() {
            continue;
        }

        // State setting lines
        if line.starts_with('@') {
            panic!("State setting line in DecompositionTypeTest.txt; expected none");
        }

        // Data lines
        {
            let fields: Vec<_> = line.split(';').map(str::trim).collect();
            let input_range = {
                let range_text = fields[0];
                let mut range = range_text.split("..");
                let low = u32::from_str_radix(range.next().unwrap(), 16).unwrap();
                let high = range
                    .next()
                    .map(|c| u32::from_str_radix(c, 16).unwrap())
                    .unwrap_or(low);
                low..(high + 1)
            };
            let exp_dt = Some(fields[1].parse().expect("Invalid Decomposition Type"));

            for codepoint in input_range {
                if let Some(ch) = char::from_u32(codepoint) {
                    let actual_dt = DT::of(ch);
                    if actual_dt != exp_dt {
                        failures.push(Fail {
                            line_num: Some(line_idx + 1),
                            ch,
                            exp_dt,
                            actual_dt,
                        });
                    } else {
                        passed_num += 1;
                    }
                    to_consider.remove(&ch);
                }
            }
        }
    }

    // Defaults
    for ch in to_consider {
        let exp_dt = None;
        let actual_dt = DT::of(ch);
        if actual_dt != exp_dt {
            failures.push(Fail {
                line_num: None,
                ch,
                exp_dt,
                actual_dt,
            });
        } else {
            passed_num += 1;
        }
    }

    // Report
    if !failures.is_empty() {
        // TODO: Show a list of failed cases when the number is less than 1K
        panic!(
            "{} test cases failed! ({} passed) {{\n\
             \n\
             0: {:?}\n\
             \n\
             ...\n\
             \n\
             {}: {:?}\n\
             \n\
             }}",
            failures.len(),
            passed_num,
            failures[0],
            failures.len() - 1,
            failures[failures.len() - 1],
        );
    }
}