Method try_downcast

crates/vm/src/object/core.rs:1275–1278

(self, vm: &VirtualMachine)

    }

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

    /// Force to downcast this reference to a subclass.
    ///