{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
                        let words = mem::MaybeUninit::<[Word; CHUNK_WORDS]>::zeroed();
                        // FIXME: unconditionally use `Rc::new_zeroed` once it is stable (#63291).
                        // SAFETY: `words` can safely be all zeroes.