hit this: ```error: no method named `spawn_fn` fou...
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hit this:
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error: no method named `spawn_fn` found for type `std::sync::RwLockReadGuard<'_, std::option::Option<futures_cpupool::CpuPool>>` in the current scope
   --> src/rust/engine/src/graph.rs:118:16
    |
118 |               .spawn_fn(move || {
    |                ^^^^^^^^