syntax_data: {"ast_node_type":"import","tokens":[{"end":89,"kind":"keyword","start":0,"text":"#[rustc_lint_opt_deny_field_access(\"use"}]}
source_snippet:     #[rustc_lint_opt_deny_field_access("use `Session::ub_checks` instead of this field")]
context_before:         "enable `TypingMode::Borrowck`, changing the way opaque types are handled during MIR borrowck"),
context_after:     ub_checks: Option<bool> = (None, parse_opt_bool, [TRACKED],