syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"unstable_options:"}]}
source_snippet:     unstable_options: bool = (false, parse_no_value, [UNTRACKED],
context_before:     #[rustc_lint_opt_deny_field_access("use `Session::unstable_options` instead of this field")]
context_after:         "adds unstable command line options to rustc interface (default: no)"),