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Updated RELEASES.md for 1.29.0 #53030

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Updated RELEASES.md for 1.29.0
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Version 1.29.0 (2018-09-13)
==========================

Compiler
--------
- [Bumped minimum LLVM version to 5.0.][51899]
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Sorry if this is naive to ask -- but is this ever actually visible to users? Isn't LLVM vendored either way?

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It's relevant to distros, so worth noting here I think.

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Again, this is entirely me being uninformed, but if you have time do you mind explaining to me why it is relevant to distros? (If you don't have time or don't care to explain this I completely understand)

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Since we've removed code from the LLVM shims that was needed for 4.9 (or whatever the previous version was, maybe 3.9) compatibility, distros that package that previous LLVM might need to do more work now. However, I believe that someone did a loose survey and we believe that most if not all distros are on 5.0+ already.

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Isn't it vendored either way though?

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You can build with your own external LLVM too, and distros usually do.

- [Added `powerpc64le-unknown-linux-musl` target.][51619]
- [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]

Libraries
---------
- [`Once::call_once` now no longer requires `Once` to be `'static`.][52239]
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@sgrif sgrif Aug 4, 2018 •
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I'm not sure what this means. Are you referring to the closure being passed to call_once? Once is either 'static or not, it's not a generic type -- the user has no control over whether that type is 'static

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Not the closure, previously call_once takes a &'static self.

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What do you think about rephrasing this as "Once::call_once now takes &self instead of &'static self"?

- [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
- [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
- [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
for `&str`.][51178]
- [`Cell<T>` now allows `T` to be unsized.][50494]
- [`SocketAddr` is now stable on Redox.][52656]

Stabilized APIs
---------------
- [`Arc::downcast`]
- [`Iterator::flatten`]
- [`Rc::downcast`]

Cargo
-----
- [Cargo can silently fix some bad lockfiles ][cargo/5831] You can use
`--locked` to disable this behaviour.
- [`cargo-install` will now allow you to cross compile an install
using `--target`][cargo/5614]
- [Added the `cargo-fix` subcommand to automatically move project code from
2015 edition to 2018.][cargo/5723]

Misc
----
- [`rustdoc` now has the `--cap-lints` option which demotes all lints above
the specified level to that level.][52354] For example `--cap-lints warn`
will demote `deny` and `forbid` lints to `warn`.
- [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
fails, and `101` if there is a panic.][52197]

Compatibility Notes
-------------------
- [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
Use `str::get_unchecked(begin..end)` instead.
- [`std::env::home_dir` is now deprecated for its unintuitive behaviour.][51656]
Consider using the `home_dir` function from
https://crates.io/crates/dirs instead.
- [`rustc` will no longer silently ignore invalid data in target spec.][52330]

[52861]: https://github.com/rust-lang/rust/pull/52861/
[52656]: https://github.com/rust-lang/rust/pull/52656/
[52239]: https://github.com/rust-lang/rust/pull/52239/
[52330]: https://github.com/rust-lang/rust/pull/52330/
[52354]: https://github.com/rust-lang/rust/pull/52354/
[52402]: https://github.com/rust-lang/rust/pull/52402/
[52103]: https://github.com/rust-lang/rust/pull/52103/
[52197]: https://github.com/rust-lang/rust/pull/52197/
[51807]: https://github.com/rust-lang/rust/pull/51807/
[51899]: https://github.com/rust-lang/rust/pull/51899/
[51912]: https://github.com/rust-lang/rust/pull/51912/
[51511]: https://github.com/rust-lang/rust/pull/51511/
[51619]: https://github.com/rust-lang/rust/pull/51619/
[51656]: https://github.com/rust-lang/rust/pull/51656/
[51178]: https://github.com/rust-lang/rust/pull/51178/
[50494]: https://github.com/rust-lang/rust/pull/50494/
[cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
[cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
[cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
[`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
[`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
[`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast


Version 1.28.0 (2018-08-02)
===========================

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