Adapt content of Chapter 16.3 in order to be consistent with improved compiler message #1779
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Update cargo, rls, books. ## nomicon 1 commits in 58e36e0e08dec5a379ac568827c058e25990d6cd..041c46e692a2592853aeca132c8dfe8eb5a79a9e 2019-10-30 08:14:24 -0500 to 2019-11-20 16:46:45 +0100 - Update unsafe-code-guidelines link (rust-lang/nomicon#175) ## cargo 15 commits in 8280633db680dec5bfe1de25156d1a1d53e6d190..750cb1482e4d0e74822cded7ab8b3c677ed8b041 2019-11-11 23:17:05 +0000 to 2019-11-23 23:06:36 +0000 - Some random comments and docstrings. (rust-lang/cargo#7625) - Add value OUT_DIR to build-script-executed JSON message (rust-lang/cargo#7622) - Update documentation for custom target dependencies. (rust-lang/cargo#7623) - Document private items for binary crates by default (rust-lang/cargo#7593) - Extend documentation on security concerns of crate names in a registry. (rust-lang/cargo#7616) - Stabilize install-upgrade. (rust-lang/cargo#7560) - Turn the new lock file format on by default (rust-lang/cargo#7579) - bump im-rc version (rust-lang/cargo#7609) - Ignore file lock errors if unsupported, on Windows (rust-lang/cargo#7602) - Add hack for fwdansi change. (rust-lang/cargo#7607) - Document Cargo's JSON output. (rust-lang/cargo#7595) - Remove "cargo login" from user input when asking for login token. (rust-lang/cargo#7588) - Fix all Clippy suggestions (but not add it to CI 🙃) (rust-lang/cargo#7574) - Add kind/platform info to `cargo metadata` (rust-lang/cargo#7132) - Update core-foundation requirement from 0.6.0 to 0.7.0 (rust-lang/cargo#7585) ## reference 2 commits in 45558c4..9e843ae 2019-11-08 14:47:35 +0100 to 2019-11-24 17:44:04 +0100 - Minor never type additions. (rust-lang/reference#723) - Update associated-items.md. "it"->is (rust-lang/reference#721) ## book 3 commits in e79dd62aa63396714278d484d91d48826737f47f..81ebaa2a3f88d4d106516c489682e64cacba4f60 2019-10-30 07:33:12 -0500 to 2019-11-15 08:30:04 -0800 - small fix ch04-03 & code block typo ch07-02 (rust-lang/book#2138) - Adapt content of Chapter 16.3 in order to be consistent with improved compiler message (rust-lang/book#1779) - [Rust 1.35] Remove FnBox and use builtin impl FnOnce for Box<FnOnce()> instead. (rust-lang/book#1906) ## rls 3 commits in 5db91c7b94ca81eead6b25bcf6196b869a44ece0..9ec2b8cb57c87517bcb506ac302eae339ffa2025 2019-10-30 16:04:39 +0100 to 2019-11-24 23:16:11 +0100 - Fix test for latest nightly. (rust-lang/rls#1595) - doc: contributing: Remove outdated LSP extension (rust-lang/rls#1594) - Update cargo. (rust-lang/rls#1591) ## rust-by-example 1 commits in dcee312c66267eb5a2f6f1561354003950e29105..4835e025826729827a94fdeb7cb85fed288d08bb 2019-10-31 11:26:53 -0300 to 2019-11-14 09:20:43 -0300 - crates: fix suggested value for --crate-type flag (rust-lang/rust-by-example#1292) ## edition-guide 1 commits in f553fb26c60c4623ea88a1cfe731eafe0643ce34..6601cab4666596494a569f94aa63b7b3230e9769 2019-10-30 08:27:42 -0500 to 2019-11-22 12:08:58 -0500 - Remove final nursery reference
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In the current state, the example (trying to move the lock into several threads in a loop) is unrolled so that we understand what the compiler is trying to tell us.
It seems that there's a new improved compiler message, with which that example is no longer needed.
I also tried to have a matching explaining text - not sure if it's the best possible explanation.