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[INFO] [stderr]     Checking chapter_04_container_sync_primitive v0.1.0 (/opt/rustwide/workdir/chapter_04_container_sync_primitive)
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[INFO] [stdout] error[E0658]: use of unstable library feature `new_zeroed_alloc`
[INFO] [stdout]   --> chapter_04_container_sync_primitive/examples/box.rs:28:21
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let box_slice = Box::<[i32]>::new_zeroed_slice(5);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #129396 <https://github.com/rust-lang/rust/issues/129396> for more information
[INFO] [stdout]    = help: add `#![feature(new_zeroed_alloc)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-11-23; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
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[INFO] [stderr] error: could not compile `chapter_04_container_sync_primitive` (example "box") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
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