im 12.3.4

Immutable collection datatypes
Documentation 
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mod hashset;
mod ordset;
mod vector;

fn code_fmt(code: &str) -> String {
    use syntect::easy::HighlightLines;
    use syntect::highlighting::{Style, ThemeSet};
    use syntect::parsing::SyntaxSet;
    use syntect::util::{as_24_bit_terminal_escaped, LinesWithEndings};

    let ps = SyntaxSet::load_defaults_newlines();
    let ts = ThemeSet::load_defaults();
    let syntax = ps.find_syntax_by_extension("rs").unwrap();
    let mut h = HighlightLines::new(syntax, &ts.themes["base16-ocean.dark"]);
    let mut out = String::from("\n\n");
    for line in LinesWithEndings::from(&code) {
        let ranges: Vec<(Style, &str)> = h.highlight(line, &ps);
        let escaped = as_24_bit_terminal_escaped(&ranges[..], false);
        out += &escaped;
    }
    out += "\n\x1b[0m";
    out
}