{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
                        let dst_align = dst_layout.align.abi.bytes().try_into().unwrap_or(128);
                        let src_align = src_layout.align.abi.bytes().try_into().unwrap_or(128);
                        fx.bcx.emit_small_memory_copy(