let mut bag = BagOfApples::new();
bag.initialize();
// ^ ERROR
// no method named `initialize` found for struct `better::BagOfApples` in the current scope
// method not found in `BagOfApples`
// lib.rs(66, 5): method `initialize` not found for this struct
// lib.rs(114, 9): consider pinning the expression: `let mut pinned = std::pin::pin!(`, `);