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: rule_list.rs
    path of file: ./repos/biome/crates/biome_css_formatter/src/css/lists
    
    the code of the file until where you have to start completion: use crate::prelude::*;
use biome_css_syntax::CssRuleList;
#[derive(Debug, Clone, D
    
    fn fmt(&self, node: &CssRuleList, f: &mut CssFormatter) -> FormatResult<()> {
        // This is one of the few cases where we _do_ want to respect empty
        // lines from the input, so we can use `join_nodes_with_hardline`.
        let mut join = f.join_nodes_with_hardline();

        for rule in node {
            join.entry(rule.syntax(), &format_or_verbatim(rule.format()));
        }

        join.finish()
    }