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: match_case.rs
    path of file: ./repos/ruff/crates/ruff_python_formatter/src/other
    
    the code of the file until where you have to start completion: use ruff_formatter::write;
use ruff_python_ast::AstNode;
use ruff_python_ast::MatchCase;

use crate::builders::parenthesize_if_expands;
use crate::comments::SourceComment;
use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses, Parentheses};
use crate::prelude::*;
use crate::statement::clause::{clause_body, clause_header, ClauseHeader};

#[derive(Def
    
    fn fmt_fields(&self, item: &MatchCase, f: &mut PyFormatter) -> FormatResult<()> {
        let MatchCase {
            range: _,
            pattern,
            guard,
            body,
        } = item;

        let comments = f.context().comments().clone();
        let dangling_item_comments = comments.dangling(item);

        write!(
            f,
            [
                clause_header(
                    ClauseHeader::MatchCase(item),
                    dangling_item_comments,
                    &format_with(|f| {
                        write!(f, [token("case"), space()])?;

                        let has_comments = comments.has_leading(pattern)
                            || comments.has_trailing_own_line(pattern);

                        if has_comments {
                            pattern.format().with_options(Parentheses::Always).fmt(f)?;
                        } else {
                            match pattern.needs_parentheses(item.as_any_node_ref(), f.context()) {
                                OptionalParentheses::Multiline => {
                                    parenthesize_if_expands(
                                        &pattern.format().with_options(Parentheses::Never),
                                    )
                                    .fmt(f)?;
                                }
                                OptionalParentheses::Always => {
                                    pattern.format().with_options(Parentheses::Always).fmt(f)?;
                                }
                                OptionalParentheses::Never => {
                                    pattern.format().with_options(Parentheses::Never).fmt(f)?;
                                }
                                OptionalParentheses::BestFit => {
                                    pattern.format().with_options(Parentheses::Never).fmt(f)?;
                                }
                            }
                        }

                        if let Some(guard) = guard {
                            write!(f, [space(), token("if"), space(), guard.format()])?;
                        }

                        Ok(())
                    }),
                ),
                clause_body(body, dangling_item_comments),
            ]
        )
    }