book: Fix nightly feature attr

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Dario Nieuwenhuis 2023-06-01 21:48:47 +02:00 committed by GitHub
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The new `async` features require that you use a nightly compiler, and that the feature `type_alias_impl_trait` is enabled for your applications. The new `async` features require that you use a nightly compiler, and that the feature `type_alias_impl_trait` is enabled for your applications.
To enable this feature, you must add the line `#![type_alias_impl_trait]` to the root file of your project, on the lines below or above where `#![no_std]` and `#![no_main]` are defined. To enable this feature, you must add the line `#![feature(type_alias_impl_trait)]` to the root file of your project, on the lines below or above where `#![no_std]` and `#![no_main]` are defined.