Function lift_sync_fn7

pub fn lift_sync_fn7<'a, T1, T2, T3, T4, T5, T6, T7, T8, E1, F: FnOnce(T1, T2, T3, T4, T5, T6, T7) -> Result<T8, E1> + Send + Sync + 'a>(
    f: F,
) -> BoxedFn7<'a, T1, T2, T3, T4, T5, T6, T7, T8, E1>

Function to box FnOnce sync function with 7 aguments and coerce it to BoxedFn7