frame-benchmarking::v2 doesn't work for force_origin

Question

In Config of my pallet I have:

type FilteredOrigin: EnsureOriginWithArg<
            Self::RuntimeOrigin,
            SomeEnum,
            Success = Self::AccountId
        >;

And there is an extrinsic in my pallet extrinsic_name where i do a check T::FilteredOrigin::ensure_origin(origin)

Firstly I wrote the bench like this using v1:

    extrinsic_name{
        let origin = T::FilteredOrigin::try_successful_origin(&SomeEnum::SomeOption).unwrap();
        // omitted
        let data = Data {...};
    }: _(origin, data)

And got the following error: expected associated type <T as frame_system::Config>::RuntimeOrigin found enum Result<RawOrigin<<T as frame_system::Config>::AccountId>, <T as frame_system::Config>::RuntimeOrigin>

Then I found a solution in one of the frame's pallets (<T::RuntimeOrigin> added):

    extrinsic_name{
        let origin = T::FilteredOrigin::try_successful_origin(&SomeEnum::SomeOption).unwrap();
        // omitted
        let data = Data {...};
    }: _<T::RuntimeOrigin>(origin, data)

Now I'm trying to use frame_benchmarking::v2, I have written the following code and got the same error:

#[benchmarks]
mod benchmarks {
    use super::*;

    #[benchmark]
    fn extrinsic_name() {
        let origin = T::FilteredOrigin::try_successful_origin(&SomeEnum::SomeOption).unwrap();
        
        // omitted
        let data = Data {...};

        #[extrinsic_call]
        _(origin, data);
    }
}

I guess the solution is described in the doc, also there is an example of doing similar thing in the pallet-lottery and I should do this way:

#[benchmarks]
mod benchmarks {
    use super::*;

    #[benchmark]
    fn extrinsic_name() {
        let origin = T::FilteredOrigin::try_successful_origin(&SomeEnum::SomeOption).unwrap();
        
        // omitted
        let data = Data {...};

        #[extrinsic_call]
        _(origin as T::RuntimeOrigin, data);
    }
}

But compiler complains to this casting. On the other hand this is working in pallet-lottery. Could someone please clarify the problem occured here and point out what am I doing wrong?

Answer 1

This is a bug that was fixed in #13845. It is included in Substrate tag polkadot-v0.9.42.

So please update to that version or remain with the V1 benchmarking.
If you find any more bugs, please report them on GitHub. The V2 syntax is not stabilized yet.