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@borsakv borsakv commented Sep 14, 2025

cc @joshtriplett

Explanation:
After analyzing the FLS, I found that there were various chapters within the FLS that are missing from the Rust Reference. Most of the information in the said chapters was present in the Reference, just scattered. However, the information from the Concurrency Chapter in the FLS seemed to be missing almost entirely, due to this I wrote the named Concurrency chapter with the help of @joshtriplett under the Rust 2025H2 Reference Expansion Goal.

I believe this chapter covers stable concepts that will not change often and is an important addition for Rust users to reference when they are working with concurrency.

Changes:
Added the initial proposal of the Concurrency Chapter with the following subheadings:

  • Send and Sync
  • Atomics
  • Asynchronous Computation

Also added new entries to the Glossary:

  • Atomic types
  • Data race
  • Marker trait

@rustbot rustbot added the S-waiting-on-review Status: The marked PR is awaiting review from a maintainer label Sep 14, 2025
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