{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"BackendRepr::ScalarPair(a,"}]}
                    BackendRepr::ScalarPair(a, b) => (a, b),
                let (a_scalar, b_scalar) = match layout.backend_repr {
                    _ => unreachable!("load_scalar_pair({:?})", self),