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: print.rs
    path of file: ./repos/c2rust/c2rust-refactor/src/rewrite/strategy
    
    the code of the file until where you have to start completion: //! Pretty-printer based rewriting strategy.
//!
//! The basic idea here is to pretty-print the new AST, which gives text that is guaranteed to
//! parse to the new AST (assuming the printer is correct), and then splice that text into the
//! source in place of the old AST's text.
//!
//! It turns out that in many cases, some subtrees of the new AST actually came from the old AST,
//! and thus have source available.  We'd prefer to use that old source text instead of the
//! pretty-printer output, since it likely has nicer formatting, comments, etc.  So there is some
//! logic in this module for "recovering" from needing to use this strategy by splicing old AST
//! text back into the new AST's pretty print
    
    fn parse(sess: &Session, src: &str) -> Self::Parsed {
        driver::run_parser(sess, src, |p| {
            match p.token.kind {
                // `parse_attribute` doesn't handle inner or outer doc comments.
                TokenKind::DocComment(s) => {
                    assert!(src.ends_with('\n'));
                    // Expand the `span` to include the trailing \n.  Otherwise multiple spliced
                    // doc comments will run together into a single line.
                    let span = p.token.span.with_hi(p.token.span.hi() + BytePos(1));
                    let attr = attr::mk_doc_comment(AttrStyle::Outer, s, span);
                    p.bump();
                    return Ok(attr);
                }
                _ => p.parse_attribute(true),
            }
        })
    }