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: dnf.rs
    path of file: ./repos/rust-analyzer/crates/cfg/src
    
    the code of the file until where you have to start completion: //! Disjunctive Normal Form construction.
//!
//! Algorithm from <https://www.cs.drexel.edu/~jjohnson/2015-16/fall/CS270/Lectures/3/dnf.pdf>,
//! which would have been much easier to read if it used pattern matching. It's also missing the
//! entire "distribute ANDs over ORs" part, which is not trivial. Oh well.
//!
//! This is currently both messy and inefficient
    
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if self.conjunctions.len() != 1 {
            f.write_str("any(")?;
        }
        for (i, conj) in self.conjunctions.iter().enumerate() {
            if i != 0 {
                f.write_str(", ")?;
            }

            conj.fmt(f)?;
        }
        if self.conjunctions.len() != 1 {
            f.write_char(')')?;
        }

        Ok(())
    }