Method fast_next

crates/vm/src/builtins/list.rs:711–723

Fast path for FOR_ITER specialization.

(&self)

impl PyListIterator {
    /// Fast path for FOR_ITER specialization.
    pub(crate) fn fast_next(&self) -> Option<PyObjectRef> {
        self.internal
            .lock()
            .next(|list, pos| {
                let vec = list.borrow_vec();
                Ok(PyIterReturn::from_result(vec.get(pos).cloned().ok_or(None)))
            })
            .ok()
            .and_then(|r| match r {
                PyIterReturn::Return(v) => Some(v),
                PyIterReturn::StopIteration(_) => None,
            })
    }
}

impl SelfIter for PyListIterator {}