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Rollup merge of rust-lang#121377 - pitaj:lazy_cell_fn_pointer, r=dtolnay Stabilize `LazyCell` and `LazyLock` Closes rust-lang#109736 This stabilizes the [`LazyLock`](https://doc.rust-lang.org/stable/std/sync/struct.LazyLock.html) and [`LazyCell`](https://doc.rust-lang.org/stable/std/cell/struct.LazyCell.html) types: ```rust static HASHMAP: LazyLock<HashMap<i32, String>> = LazyLock::new(|| { println!("initializing"); let mut m = HashMap::new(); m.insert(13, "Spica".to_string()); m.insert(74, "Hoyten".to_string()); m }); let lazy: LazyCell<i32> = LazyCell::new(|| { println!("initializing"); 92 }); ``` r? libs-api
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