Method downcast

crates/vm/src/object/core.rs:1267–1273

(self)

    /// another downcast can be attempted without unnecessary cloning.
    #[inline(always)]
    pub fn downcast<T: PyPayload>(self) -> Result<PyRef<T>, Self> {
        if self.downcastable::<T>() {
            Ok(unsafe { self.downcast_unchecked() })
        } else {
            Err(self)
        }
    }

    pub fn try_downcast<T: PyPayload>(self, vm: &VirtualMachine) -> PyResult<PyRef<T>> {
        T::try_downcast_from(&self, vm)?;