syntax_data: {"ast_node_type":"other","tokens":[{"end":7,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) {
context_before:         flags: &[RustcOptGroup],
context_after:         let has_z_unstable_option = matches.opt_strs("Z").iter().any(|x| *x == "unstable-options");