Method reduce

crates/vm/src/builtins/iter.rs:76–92

Build a pickle-compatible reduce tuple. `func` must be resolved **before** acquiring any lock that guards this `PositionIterInternal`, so that the builtins lookup cannot trigger reentrant iterator access and deadlock.

(
        &self,
        func: PyObjectRef,
        active: F,
        empty: E,
        vm: &VirtualMachine,
    )

    /// `PositionIterInternal`, so that the builtins lookup cannot trigger
    /// reentrant iterator access and deadlock.
    pub fn reduce<F, E>(
        &self,
        func: PyObjectRef,
        active: F,
        empty: E,
        vm: &VirtualMachine,
    ) -> PyTupleRef
    where
        F: FnOnce(&T) -> PyObjectRef,
        E: FnOnce(&VirtualMachine) -> PyObjectRef,
    {
        if let IterStatus::Active(obj) = &self.status {
            vm.new_tuple((func, (active(obj),), self.position))
        } else {
            vm.new_tuple((func, (empty(vm),)))
        }
    }

    fn _next<F, OP>(&mut self, f: F, op: OP) -> PyResult<PyIterReturn>
    where