Remove mention of contravariance possibly getting scrapped #177
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Contravariance is part of stable Rust, and it's a natural outcome of how `fn(T)` interacts with lifetimes, so it's hard to imagine this ever going away. tl;dr: LONG LIVE CONTRAVARIANCE!
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I'll have to admit an ulterior motive here though: I actually have a project with a |
matthewjasper
approved these changes
Dec 14, 2019
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Thanks! |
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I agree we will not be removing it |
JohnTitor
added a commit
to JohnTitor/rust
that referenced
this pull request
Jan 7, 2020
Update books ## nomicon 1 commits in 8be35b201f9cf0a4c3fcc96c83ac21671dcf3112..3e6e1001dc6e095dbd5c88005e80969f60e384e1 2019-12-01 13:02:12 -0500 to 2019-12-14 22:08:52 +0000 - Remove mention of contravariance possibly getting scrapped (rust-lang/nomicon#177) ## reference 4 commits in d8dfe1b..e115753 2019-12-14 21:04:58 +0100 to 2019-12-22 13:13:14 +0100 - Fix typo in macros-by-example.md (rust-lang/reference#733) - Remove `extern` from exception list (rust-lang/reference#732) - Added clearification that closures are refered to lambdas (rust-lang/reference#731) - abi.md: clarify #[used] and linking (rust-lang/reference#712) ## book 2 commits in ef8bb568035ded8ddfa30a9309026638cc3c8136..5c5cfd2e94cd42632798d9bd3d1116133e128ac9 2019-11-28 11:00:04 -0600 to 2019-12-16 09:27:21 -0600 - document new --show-output option in ch 11-2 (Rust >= 1.39) (rust-lang/book#2065) - Fix sentence in ch07 (rust-lang/book#2183) ## rust-by-example 3 commits in b7ac1bc76b7d02a43c83b3a931d226f708aa1ff4..1d59403cb5269c190cc52a95584ecc280345495a 2019-12-02 11:38:43 -0300 to 2019-12-27 08:27:05 -0300 - Enable section-folding of table of content (rust-lang/rust-by-example#1290) - Remove unnecessary lifetime annotation (rust-lang/rust-by-example#1300) - eliminate the warnings (rust-lang/rust-by-example#1301) ## edition-guide 1 commits in 6601cab4666596494a569f94aa63b7b3230e9769..1a2390247ad6d08160e0dd74f40a01a9578659c2 2019-11-22 12:08:58 -0500 to 2019-12-29 10:40:55 -0800 - Updated install and uninstall instructions (rust-lang/edition-guide#194) ## embedded-book 1 commits in c26234930282210849256e4ecab925f0f2daf3be..9493b7d4dc97eda439bd8780f05ad7b234cd1cd7 2019-12-07 17:25:11 +0000 to 2019-12-27 20:05:00 +0000 - fixed typo in Interrupts.md (rust-embedded/book#218)
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Contravariance is part of stable Rust, and it's a natural outcome of how
fn(T)interacts with lifetimes, so it's hard to imagine this ever going away.tl;dr: LONG LIVE CONTRAVARIANCE!