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: panic.rs
    path of file: ./repos/miette/src
    
    the code of the file until where you have to start completion: use backtrace::Backtrace;
use thiserror::Error;

use crate::{self as miette, Context, Diagnostic, Result};

/// Tells miette to render panics using its rendering engine.
pub fn set_panic_hook() {
    std::panic::set_hook(Box::new(move |info| {
        let mut message = "Something went wrong".to_string();
        let payload = info.payload();
        if let Some(msg) = payload.downcast_ref::<&str>() {
            message = msg.to_string();
        }
        if let Some(msg) = payload.downcast_ref::<String>() {
            message = msg.clone();
        }
        let mut report: Result<()> = Err(Panic(message).into());
        if let Some(loc) = info.location() {
            report = report
                .with_context(|| format!("at {}:{}:{}", loc.file(), loc.line(), loc.column()));
        }
        if let Err(err) = report.with_context(|| "Main thread panicked.".to_string()) {
            eprintln!("Error: {:?}", err);
        }
    }));
}

#[derive(Debug, Error, Diagnostic)]
#[error("{0}{}", Panic::backtrace())]
#[diagnostic(help("set the `RUST_BACKTRACE=1` environment variable to display a backtrace."))]
struct Panic(String);

impl Panic {
    fn backtrace() -> String {
        use std::fmt::Write;
        if let Ok(var) = std::env::var("RUST_BACKTRACE") {
            if !var.is_empty() && var != "0" {
                const HEX_WIDTH: usize = std::mem::size_of::<usize>() + 2;
                // Padding for next lines after frame's address
                const NEXT_SYMBOL_PADDING: usize = HEX_WIDTH + 6;
                let mut backtrace = String::new();
                let trace = Backtrace::new();
      
    
    fn backtrace() -> String {
        use std::fmt::Write;
        if let Ok(var) = std::env::var("RUST_BACKTRACE") {
            if !var.is_empty() && var != "0" {
                const HEX_WIDTH: usize = std::mem::size_of::<usize>() + 2;
                // Padding for next lines after frame's address
                const NEXT_SYMBOL_PADDING: usize = HEX_WIDTH + 6;
                let mut backtrace = String::new();
                let trace = Backtrace::new();
                let frames = backtrace_ext::short_frames_strict(&trace).enumerate();
                for (idx, (frame, sub_frames)) in frames {
                    let ip = frame.ip();
                    let _ = write!(backtrace, "\n{:4}: {:2$?}", idx, ip, HEX_WIDTH);

                    let symbols = frame.symbols();
                    if symbols.is_empty() {
                        let _ = write!(backtrace, " - <unresolved>");
                        continue;
                    }

                    for (idx, symbol) in symbols[sub_frames].iter().enumerate() {
                        // Print symbols from this address,
                        // if there are several addresses
                        // we need to put it on next line
                        if idx != 0 {
                            let _ = write!(backtrace, "\n{:1$}", "", NEXT_SYMBOL_PADDING);
                        }

                        if let Some(name) = symbol.name() {
                            let _ = write!(backtrace, " - {}", name);
                        } else {
                            let _ = write!(backtrace, " - <unknown>");
                        }

                        // See if there is debug information with file name and line
                        if let (Some(file), Some(line)) = (symbol.filename(), symbol.lineno()) {
                            let _ = write!(
                                backtrace,
                                "\n{:3$}at {}:{}",
                                "",
                                file.display(),
                                line,
                                NEXT_SYMBOL_PADDING
                            );
                        }
                    }
                }
                return backtrace;
            }
        }
        "".into()
    }