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Document handle_alloc_error feature in Unstable Book #108676

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Document handle_alloc_error feature in Unstable Book #108676

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20 changes: 20 additions & 0 deletions src/doc/unstable-book/src/language-features/alloc-error-handler.md
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# `alloc_error_handler`

The tracking issue for this feature is: [#51540]

[#51540]: https://github.com/rust-lang/rust/issues/51540

------------------------

This attribute is mandatory when using the alloc crate without the std crate. It is used when handling out of memory (OOM) allocation error, and is called
by `alloc::alloc::handle_alloc_error`

``` rust,ignore (partial-example)
#![feature(alloc_error_handler)]
#![no_std]

#[alloc_error_handler]
fn foo(_: core::alloc::Layout) -> ! {
// …
}
```