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: generic_generic.rs
    path of file: ./repos/windows-rs/crates/tests/implement/tests
    
    the code of the file until where you have to start completion: use windows::core::*;
use windows::Foundation::Collections::*;
use windows::Foundation::*;

#[implement(
    IVectorView<T>,
)]
struct Thing<T>(Vec<T>)
where
    T: RuntimeType + 'static + Clone,
    <T as Type<T>>::Default: PartialEq;

#[allow(non_snake_case)]
impl<T> IVectorView_Impl<T> for Thing<T>
where
    T: RuntimeType + 'static + Clone,
    <T as Type<T>>::Default: PartialEq,
{
    fn GetAt(&self, index: u32) -> Result<T> {
        self.0.get(index as usize).cloned().ok_or_els
    
fn test_implement() -> Result<()> {
    let v: IVectorView<i32> = Thing(vec![10, 20, 30]).into();
    assert_eq!(10, v.GetAt(0)?);
    assert_eq!(20, v.GetAt(1)?);
    assert_eq!(30, v.GetAt(2)?);

    let v: IVectorView<HSTRING> = Thing(vec!["10".into(), "20".into(), "30".into()]).into();
    assert_eq!("10", v.GetAt(0)?);
    assert_eq!("20", v.GetAt(1)?);
    assert_eq!("30", v.GetAt(2)?);

    let url1: HSTRING = "http://one/".into();
    let url2: HSTRING = "http://two/".into();
    let url3: HSTRING = "http://three/".into();
    let v: IVectorView<IStringable> = Thing(vec![
        Uri::CreateUri(&url1)?.cast()?,
        Uri::CreateUri(&url2)?.cast()?,
        Uri::CreateUri(&url3)?.cast()?,
    ])
    .into();

    assert_eq!("http://one/", v.GetAt(0)?.ToString()?);
    assert_eq!("http://two/", v.GetAt(1)?.ToString()?);
    assert_eq!("http://three/", v.GetAt(2)?.ToString()?);

    Ok(())
}