{"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
                let dont_poison_on_zero = bx.const_int(bx.type_i1(), 0);
                // for the (int, i1 immediate) pair, the second arg adds `(0, true) => poison`
                Ok(bx.call_intrinsic(