rustc-ap-rustc_arena 717.0.0

Automatically published version of the package `rustc_arena` in the rust-lang/rust repository from commit 22b686ad9995266b695344fcfb8e14f710b9ea6b 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 several kinds of arena.