{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"Some(tokenstream::TokenTree::Token(token,"}]}
                Some(tokenstream::TokenTree::Token(token, _)) if token.is_ident() => {
                // special metavariable that names the crate of the invocation.
                    let (ident, is_raw) = token.ident().unwrap();