{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
                let unit = vector_type.get_num_units();
                let vector_type = arg_type.dyncast_vector().expect("vector type");
                let a = bx.context.new_rvalue_from_int(elem_ty, ((elem_width as i32) << 3) - 1);