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: onepass.rs
    path of file: ./repos/regex/regex-cli/args
    
    the code of the file until where you have to start completion: use {
    anyhow::Context,
    lexopt::{Arg, Parser},
    regex_automata::{dfa::onepass, nfa::thompson::NFA},
};

use crate::args::{self, flags, Configurable, Usage};

/// Exposes the configuration of a one-pass DFA.
#[derive(Debug, Default)]
pub struct Config {
    onepass: onepass::Config,
}

impl Config {
    /// Return a `dfa::onepass::Config` object from this configuration.
    pub fn onepass(&self) -> anyhow::Result<onepass::Config> {
        Ok(self.onepass.clone())
    }
    
    fn usage(&self) -> &[Usage] {
        const USAGES: &'static [Usage] = &[
            flags::MatchKind::USAGE,
            Usage::new(
                "--starts-for-each-pattern",
                "Add anchored start states for each pattern.",
                r#"
Add anchored start states for each pattern. This permits running an anchored
search for a specific pattern using the --pattern-id flag. (Assuming this is
a search command.)
"#,
            ),
            Usage::new(
                "-C, --no-byte-classes",
                "Disable byte classes.",
                r#"
This causes all bytes to be an equivalence class unto themselves. By default,
bytes are grouped into equivalence classes to reduce the size of the alphabet
for a DFA, and therefore decreases overall space usage.

It can be quite convenient to disable byte classes when looking at the debug
representation of a DFA. Otherwise, the transitions are much harder for a human
to read.
"#,
            ),
            Usage::new(
                "--onepass-size-limit",
                "Set a limit on heap used by a one-pass DFA in bytes.",
                r#"
This sets a limit on the number of heap memory a one-pass DFA can use. The
limit is enforced at one-pass DFA construction time. If the limit is exceeded,
then construction will fail.

A special value of 'none' may be given, which disables the limit.
"#,
            ),
        ];
        USAGES
    }