{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
        let attrs = db.attrs(AttrDefId::ModuleId(self.root_module().into()));
        // Look for #![doc(html_root_url = "...")]
        let doc_url = attrs.by_key(sym::doc).find_string_value_in_tt(sym::html_root_url);