{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
        let doc_url = attrs.by_key(sym::doc).find_string_value_in_tt(sym::html_root_url);
        let attrs = db.attrs(AttrDefId::ModuleId(self.root_module().into()));
        doc_url.map(|s| s.trim_matches('"').trim_end_matches('/').to_owned() + "/")