Method __getitem__

crates/vm/src/builtins/genericalias.rs:222–232

(zelf: PyRef<Self>, needle: PyObjectRef, vm: &VirtualMachine)

    }

    fn __getitem__(zelf: PyRef<Self>, needle: PyObjectRef, vm: &VirtualMachine) -> PyResult {
        let new_args = subs_parameters(
            zelf.to_owned().into(),
            zelf.args.clone(),
            zelf.parameters.clone(),
            needle,
            vm,
        )?;

        Ok(Self::new(zelf.origin.clone(), new_args, false, vm).into_pyobject(vm))
    }

    #[pymethod]
    fn __dir__(&self, vm: &VirtualMachine) -> PyResult<PyList> {