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Update for the removal of Unique<T> - #529
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The document describes `Unique<T>`, how the standard library uses it, and how to work around it not being stable. But, as of rust-lang/rust#164146, we've removed `Unique<T>`. Essentially, it's been inlined everywhere it was used. Let's update the nomicon accordingly. And let's also remove the `allocator_api` feature flag, as it's no longer needed due to the recent stabilization.
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The document describes
Unique<T>, how the standard library uses it, and how to work around it not being stable.But, as of rust-lang/rust#164146, we've removed
Unique<T>. Essentially, it's been inlined everywhere it was used.Let's update the nomicon accordingly. And let's also remove the
allocator_apifeature flag, as it's no longer needed due to the recent stabilization.This fixes the toolstate failure reported in rust-lang/rust#164187.
cc @JohnTitor