Because doc code does not get automatically formatted, some doc code has creative placements of comments that automatic formatting can't handle. Reformat those comments to make the resulting code support standard Rust formatting without breaking; this is generally an improvement to readability as well. Some comments are not indented to the prevailing indent, and are instead aligned under some bit of code. Indent them to the prevailing indent, and put spaces *inside* the comments to align them with code. Some comments span several lines of code (which aren't the line the comment is about) and expect alignment. Reformat them into one comment not broken up by unrelated intervening code. Some comments are placed on the same line as an opening brace, placing them effectively inside the subsequent block, such that formatting would typically format them like a line of that block. Move those comments to attach them to what they apply to. Some comments are placed on the same line as a one-line braced block, effectively attaching them to the closing brace, even though they're about the code inside the block. Reformat to make sure the comment will stay on the same line as the code it's commenting.
Note: This is an unstable fork made for use in rustc
Rayon-core represents the "core, stable" APIs of Rayon: join, scope, and so forth, as well as the ability to create custom thread-pools with ThreadPool.
Maybe worth mentioning: users are not necessarily intended to directly access rustc_thread_pool; all its APIs are mirrored in the rayon crate. To that end, the examples in the docs use rayon::join and so forth rather than rayon_core::join.
Please see Rayon Docs for details about using Rayon.