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/polars/crates/polars-core/src/chunked_array/object/extension
    
    the code of the file until where you have to start completion: pub(crate) mod drop;
mod list;
pub(crate) mod polars_extension;

use std::mem;

use arrow::array::FixedSizeBinaryArray;
use arrow::bitmap::MutableB
    
    fn test_create_extension() {
        std::env::set_var("POLARS_ALLOW_EXTENSION", "1");
        // Run this under MIRI.
        let foo = Foo {
            a: 1,
            b: 1,
            other_heap: "foo".into(),
        };
        let foo2 = Foo {
            a: 1,
            b: 1,
            other_heap: "bar".into(),
        };

        let vals = vec![Some(foo), Some(foo2)];
        create_extension(vals.into_iter());
    }