rustc-ap-arena 324.0.0

Automatically published version of the package `arena` in the rust-lang/rust repository from commit e57ab2699d4c2466449444b0faffc3fb11aefac2 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
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The arena, a fast but limited type of allocator.

Arenas are a type of allocator that destroy the objects within, all at once, once the arena itself is destroyed. They do not support deallocation of individual objects while the arena itself is still alive. The benefit of an arena is very fast allocation; just a pointer bump.

This crate implements TypedArena, a simple arena that can only hold objects of a single type.