syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"ub_checks:"}]}
source_snippet:     ub_checks: Option<bool> = (None, parse_opt_bool, [TRACKED],
context_before:     #[rustc_lint_opt_deny_field_access("use `Session::ub_checks` instead of this field")]
context_after:         "emit runtime checks for Undefined Behavior (default: -Cdebug-assertions)"),