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Add chapter to book for nightly use #2762

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Add chapter to book for nightly use #2762

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1 change: 1 addition & 0 deletions burn-book/src/SUMMARY.md
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- [Custom Optimizer]()
- [WebAssembly]()
- [No-Std](./advanced/no-std.md)
- [Nightly](./advanced/nightly.md)
17 changes: 17 additions & 0 deletions burn-book/src/advanced/nightly.md
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# Nightly

Burn has nightly support by default. However, one may meet this error during compilation:

```
error[E0658]: use of unstable library feature `allocator_api`
```

To solve it, the `hashbrown` crate with version higher than `0.15` needs to be involved explicitly in `Cargo.toml`:

```toml
hashbrown = { version = "0.15", features = ["nightly"] }
```

even it's not required by your code.

See [here](https://github.com/rust-lang/hashbrown/issues/564) for track the issue and [here](https://github.com/zakarumych/allocator-api2/issues/19) for the status.