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: parse.rs
    path of file: ./repos/snarkVM/synthesizer/program/src/function
    
    the code of the file until where you have to start completion: // Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkVM library.

// Licensed 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 super::*;

impl<N: Network, Instruction: InstructionTrait<N>, Command: CommandTrait<N>> Parser
    for FunctionCore<N, Instruction, Command>
{
    /// Parses a string into a function.
    #[inline]
    fn parse(string: &str) -> ParserResult<Self> {
        // Parse the whitespace and comments from the string.
  
    
    fn parse(string: &str) -> ParserResult<Self> {
        // Parse the whitespace and comments from the string.
        let (string, _) = Sanitizer::parse(string)?;
        // Parse the 'function' keyword from the string.
        let (string, _) = tag(Self::type_name())(string)?;
        // Parse the whitespace from the string.
        let (string, _) = Sanitizer::parse_whitespaces(string)?;
        // Parse the function name from the string.
        let (string, name) = Identifier::<N>::parse(string)?;
        // Parse the whitespace from the string.
        let (string, _) = Sanitizer::parse_whitespaces(string)?;
        // Parse the colon ':' keyword from the string.
        let (string, _) = tag(":")(string)?;

        // Parse the inputs from the string.
        let (string, inputs) = many0(Input::parse)(string)?;
        // Parse the instructions from the string.
        let (string, instructions) = many0(Instruction::parse)(string)?;
        // Parse the outputs from the string.
        let (string, outputs) = many0(Output::parse)(string)?;

        // Parse an optional finalize command from the string.
        let (string, finalize) = opt(FinalizeCore::parse)(string)?;

        map_res(take(0usize), move |_| {
            // Initialize a new function.
            let mut function = Self::new(name);
            if let Err(error) = inputs.iter().cloned().try_for_each(|input| function.add_input(input)) {
                eprintln!("{error}");
                return Err(error);
            }
            if let Err(error) =
                instructions.iter().cloned().try_for_each(|instruction| function.add_instruction(instruction))
            {
                eprintln!("{error}");
                return Err(error);
            }
            if let Err(error) = outputs.iter().cloned().try_for_each(|output| function.add_output(output)) {
                eprintln!("{error}");
                return Err(error);
            }
            if let Some(finalize) = &finalize {
                if let Err(error) = function.add_finalize(finalize.clone()) {
                    eprintln!("{error}");
                    return Err(error);
                }
            }
            Ok::<_, Error>(function)
        })(string)
    }