How to return an owned property from an API response?

[ntkr]

I would like to write a function that uses the aws s3 api to list the contents of a bucket (a list of ListBucketResponse) and return just the contents field from the first element for (immutable) use elsewhere in the application. Currently I get the error:

error[E0507]: cannot move out of a shared reference
  --> src\main.rs:99:5
   |
99 |     list_result.first().unwrap().contents
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ move occurs because value has type `Vec<Object>`, which does not implement the `Copy` trait

from the following code:

async fn get_bucket_contents
    (s3_client: Bucket) -> Vec<Object> 
{

    let list_result = s3_client
        .list("".to_string(), None)
        .await
        .expect("failed to list s3 contents");

    list_result.first().unwrap().contents
}

Why is the list_result reference shared? I thought it would be owned entirely by this function and could transfer ownership of a child property when the function terminates.

thank you all in advance for your help!

[kornel]

.first() temporarily borrows the first element, without ability to move or return it elsewhere. Rust references allow looking at elements, but not own or destroy them.

vec.remove(0) or vec.swap_remove(0) will remove the element from a vector, and pass ownership of the element to you, so then you can use that element however you want.

Alternatively, .clone() an element to get a new copy that you can return.