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Add release notes for 1.0.0-beta #23959

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Add release notes for 1.0.0-beta #23959

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99 changes: 99 additions & 0 deletions RELEASES.md
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Version 1.0.0-beta (April 2015)
-------------------------------------

* ~1100 changes, numerous bugfixes

* Highlights

* The big news is that the vast majority of the standard library
is now `#[stable]` -- 75% of the non-deprecated API surface at
last count. Numerous crates are now running on stable
Rust. Starting with this release, it is not possible to use
unstable features on a stable build.
* Arithmetic on basic integer types now
[checks for overflow in debug builds][overflow].

* Language

* [`Send` no longer implies `'static`][send-rfc], which made
possible the [`thread::scoped` API][scoped]. Scoped threads can
borrow data from their parent's stack frame -- safely!
* [UFCS now supports trait-less associated paths][moar-ufcs] like
`MyType::default()`.
* Primitive types [now have inherent methods][prim-inherent],
obviating the need for extension traits like `SliceExt`.
* Methods with `Self: Sized` in their `where` clause are
[considered object-safe][self-sized], allowing many extension
traits like `IteratorExt` to be merged into the traits they
extended.
* You can now [refer to associated types][assoc-where] whose
corresponding trait bounds appear only in a `where` clause.
* The final bits of [OIBIT landed][oibit-final], meaning that
traits like `Send` and `Sync` are now library-defined.
* A [Reflect trait][reflect] was introduced, which means that
downcasting via the `Any` trait is effectively limited to
concrete types. This helps retain the potentially-important
"parametricity" property: generic code cannot behave differently
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This helps retain the potentially-important "parametricity" property: generic code cannot behave differently for different type arguments.

You may want to weaken this claim slightly. For example, there's still the option of different behavior based on the value of mem::size_of::<T>(), among other options. Up to you.

for different type arguments.
* The `unsafe_destructor` feature is now deprecated in favor of
the [new `dropck`][dropck]. This change is a major reduction in
unsafe code.
* Trait coherence was [revised again][fundamental], this time with
an eye toward API evolution over time.

* Libraries

* The new path and IO modules are complete and `#[stable]`. This
was the major library focus for this cycle.
* The path API was [revised][path-normalize] to normalize `.`,
adjusting the tradeoffs in favor of the most common usage.
* A large number of remaining APIs in `std` were also stabilized
during this cycle; about 75% of the non-deprecated API surface
is now stable.
* The new [string pattern API][string-pattern] landed, which makes
the string slice API much more internally consistent and flexible.
* A shiny [framework for Debug implementations][debug-builder] landed.
This makes it possible to opt in to "pretty-printed" debugging output.
* A new set of [generic conversion traits][conversion] replaced
many existing ad hoc traits.
* Generic numeric traits were
[completely removed][num-traits]. This was made possible thanks
to inherent methods for primitive types, and the removal gives
maximal flexibility for designing a numeric hierarchy in the future.
* The `Fn` traits are now related via [inheritance][fn-inherit]
and provide ergonomic [blanket implementations][fn-blanket].
* The `Index` and `IndexMut` traits were changed to
[take the index by value][index-value], enabling code like
`hash_map["string"]` to work.
* `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
`Copy` data is known to be `Clone` as well.

* Infrastructure

* Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
* Much headway was made on ecosystem-wide CI, making it possible
to [compare builds for breakage][ci-compare].

[send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
[scoped]: http://static.rust-lang.org/doc/master/std/thread/fn.scoped.html
[moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
[prim-inherent]: https://github.com/rust-lang/rust/pull/23104
[overflow]: https://github.com/rust-lang/rust/pull/22532
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should this point instead at the integer overflow RFC? Or did you want to keep focus on what was actually implemented, versus what pieces still may remain unimplemented from the RFC? (Or is the RFC PR itself not a useful document to point to ... in which case I would suggest pointing to the text of the merged RFC itself?)

I'm just not sure the implementation PR is itself the most useful pointer to provide for this document.

[metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
[self-sized]: https://github.com/rust-lang/rust/pull/22301
[assoc-where]: https://github.com/rust-lang/rust/pull/22512
[string-pattern]: https://github.com/rust-lang/rust/pull/22466
[oibit-final]: https://github.com/rust-lang/rust/pull/21689
[reflect]: https://github.com/rust-lang/rust/pull/23712
[debug-builder]: https://github.com/rust-lang/rfcs/blob/master/text/0640-debug-improvements.md
[conversion]: https://github.com/rust-lang/rfcs/pull/529
[num-traits]: https://github.com/rust-lang/rust/pull/23549
[index-value]: https://github.com/rust-lang/rust/pull/23601
[dropck]: https://github.com/rust-lang/rfcs/pull/769
[fundamental]: https://github.com/rust-lang/rfcs/pull/1023
[ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
[fn-inherit]: https://github.com/rust-lang/rust/pull/23282
[fn-blanket]: https://github.com/rust-lang/rust/pull/23895
[copy-clone]: https://github.com/rust-lang/rust/pull/23860
[path-normalize]: https://github.com/rust-lang/rust/pull/23229

Version 1.0.0-alpha.2 (February 2015)
-------------------------------------

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