{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"TokenTree::Token(Token"}]}
                        TokenTree::Token(Token { kind: token::FatArrow, .. }, _),
                        TokenTree::Delimited(.., first_delim, first_tts),
                        TokenTree::Delimited(.., second_delim, second_tts),