{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
    let contents = add_preamble(crate::flags::CodegenType::DiagnosticsDocs, contents);
        diagnostics.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
    let dst = project_root().join("docs/book/src/diagnostics_generated.md");