{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
                        let zero = fx.bcx.ins().iconst(fx.pointer_type, 0);
                        let index = fx.bcx.append_block_param(loop_block, fx.pointer_type);
                        fx.bcx.ins().jump(loop_block, &[zero.into()]);