t.Errorf("failed scalar->bytes->scalar round-trip: %v", err) } expectReject := func(b []byte) { t.Helper() s := scOne if out, err := s.SetCanonicalBytes(b[:]); err == nil { t.Errorf("SetCanonicalBytes worked on a non-canonical value") } else if s != scOne { t.Errorf("SetCanonicalBytes modified its receiver") } else if out != nil { t.Errorf("SetCanonicalBytes did not return nil with an error") } } b := scMinusOne.Bytes() b[0] += 1 expectReject(b) b = scMinusOne.Bytes() b[31] += 1 expectReject(b) b = scMinusOne.Bytes()...