syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"\"turns"}]}
source_snippet:         "turns on more checks to detect const UB, which can be slow (default: no)"),
context_before:     extra_const_ub_checks: bool = (false, parse_bool, [TRACKED],
context_after:     #[rustc_lint_opt_deny_field_access("use `Session::fewer_names` instead of this field")]