def rd.cut.at
import bend-kit-runner@0.13.0.1/runner.bend as Runnerimport Base
import bend-kit-bytes@0.3.3.0/bytes.bend as Bytes
690def rd.cut.at(+n: U32, r: Rd) -> Maybe<&1, Rd & Bytes.Bytes>:
691 Rd{Bytes.Bytes{+len, buf}, +at} = r
692 rd.cut.if(Bytes.fits(len, at, n), Bytes.Bytes{len, buf}, at, n)