`inclusive_scan_by_key` not accepting `discard_iterator` as output iterator

[isVoid]

Minimal reproduction code:

void foo(thrust::device_vector<int> v)
{
    auto out = thrust::make_discard_iterator();

    thrust::inclusive_scan(thrust::host, v.begin(), v.end(), out);
}

void bar(thrust::device_vector<int> k, thrust::device_vector<int> v)
{
    auto out = thrust::make_discard_iterator();

    thrust::inclusive_scan_by_key(thrust::host, k.begin(), k.end(), v.begin(), out);
}

Environment: NVCC 10.2.89, Thrust 1.10.0

https://godbolt.org/z/WrvG3z