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: v0.rs
    path of file: ./repos/incubator-teaclave-sgx-sdk/sgx_demangle/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..

use core::convert::TryFrom;
use core::{char, fmt, iter, mem, str};

// Maximum recursion depth when parsing symbols before we just bail out saying
// "this symbol is invalid"
const MAX_DEPTH: u32 = 500;

/// Representation of a demangled symbol name.
pub struct Demangle<'a> {
    inner: &'a str,
}

#[derive(PartialEq, Eq, Debug)]
pub enum ParseError {
    /// Symbol doesn't match the expected `v0` grammar.
    Invalid,

    /// Parsing the symbol crossed the recursion limit (see `MAX_DEPTH`).
    RecursedTooDeep,
}

/// De-mangles a Rust symbol into a more readable version
///
/// This function will take a **ma
    
    fn print_type(&mut self) -> fmt::Result {
        let tag = parse!(self, next);

        if let Some(ty) = basic_type(tag) {
            return self.print(ty);
        }

        parse!(self, push_depth);

        match tag {
            b'R' | b'Q' => {
                self.print("&")?;
                if self.eat(b'L') {
                    let lt = parse!(self, integer_62);
                    if lt != 0 {
                        self.print_lifetime_from_index(lt)?;
                        self.print(" ")?;
                    }
                }
                if tag != b'R' {
                    self.print("mut ")?;
                }
                self.print_type()?;
            }

            b'P' | b'O' => {
                self.print("*")?;
                if tag != b'P' {
                    self.print("mut ")?;
                } else {
                    self.print("const ")?;
                }
                self.print_type()?;
            }

            b'A' | b'S' => {
                self.print("[")?;
                self.print_type()?;
                if tag == b'A' {
                    self.print("; ")?;
                    self.print_const(true)?;
                }
                self.print("]")?;
            }
            b'T' => {
                self.print("(")?;
                let count = self.print_sep_list(Self::print_type, ", ")?;
                if count == 1 {
                    self.print(",")?;
                }
                self.print(")")?;
            }
            b'F' => self.in_binder(|this| {
                let is_unsafe = this.eat(b'U');
                let abi = if this.eat(b'K') {
                    if this.eat(b'C') {
                        Some("C")
                    } else {
                        let abi = parse!(this, ident);
                        if abi.ascii.is_empty() || !abi.punycode.is_empty() {
                            invalid!(this);
                        }
                        Some(abi.ascii)
                    }
                } else {
                    None
                };

                if is_unsafe {
                    this.print("unsafe ")?;
                }

                if let Some(abi) = abi {
                    this.print("extern \"")?;

                    // If the ABI had any `-`, they were replaced with `_`,
                    // so the parts between `_` have to be re-joined with `-`.
                    let mut parts = abi.split('_');
                    this.print(parts.next().unwrap())?;
                    for part in parts {
                        this.print("-")?;
                        this.print(part)?;
                    }

                    this.print("\" ")?;
                }

                this.print("fn(")?;
                this.print_sep_list(Self::print_type, ", ")?;
                this.print(")")?;

                if this.eat(b'u') {
                    // Skip printing the return type if it's 'u', i.e. `()`.
                } else {
                    this.print(" -> ")?;
                    this.print_type()?;
                }

                Ok(())
            })?,
            b'D' => {
                self.print("dyn ")?;
                self.in_binder(|this| {
                    this.print_sep_list(Self::print_dyn_trait, " + ")?;
                    Ok(())
                })?;

                if !self.eat(b'L') {
                    invalid!(self);
                }
                let lt = parse!(self, integer_62);
                if lt != 0 {
                    self.print(" + ")?;
                    self.print_lifetime_from_index(lt)?;
                }
            }
            b'B' => {
                self.print_backref(Self::print_type)?;
            }
            _ => {
                // Go back to the tag, so `print_path` also sees it.
                let _ = self.parser.as_mut().map(|p| p.next -= 1);
                self.print_path(false)?;
            }
        }

        self.pop_depth();
        Ok(())
    }