Function syntax::print::pprust::print_crate

pub fn print_crate<'a>(
    cm: &'a CodeMap, 
    sess: &ParseSess, 
    krate: &Crate, 
    filename: FileName, 
    input: &mut Read, 
    out: Box<Write + 'a>, 
    ann: &'a PpAnn, 
    is_expanded: bool
) -> Result<()>

Requires you to pass an input filename and reader so that it can scan the input text for comments and literals to copy forward.