syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"split_extern_opt(early_dcx,"}]}
source_snippet:             split_extern_opt(early_dcx, unstable_opts, &arg).unwrap_or_else(|e| e.emit());
context_before:         let ExternOpt { crate_name: name, path, options } =