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: mir.rs
    path of file: ./repos/logos/logos-codegen/src
    
    the code of the file until where you have to start completion: use std::convert::TryFrom;

use lazy_static::lazy_static;
use regex_syntax::hir::{Dot, Hir, HirKind};
use regex_syntax::ParserBuilder;

pub use regex_syntax::hir::{Class, ClassUnicode, Literal};

use crate::error::{Error, Result};

lazy_static! {
    static ref DOT_UTF8: Hir = Hir::dot(Dot::AnyChar);
    static ref DOT_BYTES: Hir = Hir::dot(Dot::AnyByte);
}

/// Middle Intermediate Representation of the regex, built from
/// `
    
    pub fn priority(&self) -> usize {
        match self {
            Mir::Empty | Mir::Loop(_) | Mir::Maybe(_) => 0,
            Mir::Concat(concat) => concat.iter().map(Mir::priority).sum(),
            Mir::Alternation(alt) => alt.iter().map(Mir::priority).min().unwrap_or(0),
            Mir::Class(_) => 2,
            Mir::Literal(lit) => match std::str::from_utf8(&lit.0) {
                Ok(s) => 2 * s.chars().count(),
                Err(_) => 2 * lit.0.len(),
            },
        }
    }