{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"///"}]}
    /// `None` indicates this is not validating for CTFE (but for runtime).
    ref_tracking: Option<&'rt mut RefTracking<MPlaceTy<'tcx, M::Provenance>, Vec<PathElem>>>,
    ctfe_mode: Option<CtfeValidationMode>,