You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/windows-rs/crates/libs/windows/src/Windows/Graphics/Holographic
    
    the code of the file until where you have to start completion: windows_core::imp::define_interface!(IHolographicCamera, IHolographicCamera_Vtbl, 0xe4e98445_9bed_4980_9
    
    pub fn LeftViewportParameters(&self) -> windows_core::Result<HolographicCameraViewportParameters> {
        let this = &windows_core::Interface::cast::<IHolographicCamera2>(self)?;
        unsafe {
            let mut result__ = std::mem::zeroed();
            (windows_core::Interface::vtable(this).LeftViewportParameters)(windows_core::Interface::as_raw(this), &mut result__).and_then(|| windows_core::Type::from_abi(result__))
        }
    }