{"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"let"}]}
        let res = bx.cx().const_poison(cast_ty);
        let second = bx.load(second_ty, second_ptr, align.restrict_for_offset(offset_from_start));
        let res = bx.insert_value(res, first, 0);