Auto merge of #52986 - pietroalbini:beta-backports, r=Mark-Simulacrum

[beta] Rollup backports & switch bootstrap compiler

This PR switches the bootstrap compiler from dev-static to static, and rollups some backports.

Merged and approved:

* #52929: Update compatibility note for 1.28.0 to be correct
* #52918: Backport 1.27.2 release notes
* #52867: releases.md: fix 2 typos
* #52996: RELEASES.md: fix the `hash_map::Entry::or_default` link

r? @Mark-Simulacrum

RELEASES.md

@@ -94,9 +94,9 @@ Misc
 
 Compatibility Notes
 -------------------
-- [Rust will no longer consider trait objects with duplicated constraints to
-  have implementations.][51276] For example the below code will now fail
-  to compile.
+- [Rust will consider trait objects with duplicated constraints to be the same
+  type as without the duplicated constraint.][51276] For example the below code will
+  now fail to compile.
   ```rust
   trait Trait {}
 
@@ -144,7 +144,7 @@ Compatibility Notes
 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
-[`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
+[`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
@@ -160,6 +160,17 @@ Compatibility Notes
 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
 
+Version 1.27.2 (2018-07-20)
+===========================
+
+Compatibility Notes
+-------------------
+
+- The borrow checker was fixed to avoid potential unsoundness when using
+  match ergonomics: [#52213][52213].
+
+[52213]: https://github.com/rust-lang/rust/issues/52213
+
 Version 1.27.1 (2018-07-10)
 ===========================
 
@@ -190,7 +201,7 @@ Version 1.27.0 (2018-06-21)
 Language
 --------
 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
-  be used as an identifer.
+  be used as an identifier.
 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
   bare `Trait` syntax, and should make it clearer when being used in tandem with
   `impl Trait`. Since it is equivalent to the following syntax:
@@ -4795,7 +4806,7 @@ Language
 --------
 
 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
-  matching against dereferencable values.
+  matching against dereferenceable values.
 
 Libraries
 ---------

src/stage0.txt

@@ -12,7 +12,7 @@
 # source tarball for a stable release you'll likely see `1.x.0` for rustc and
 # `0.x.0` for Cargo where they were released on `date`.
 
-date: 2018-07-31
+date: 2018-08-02
 rustc: 1.28.0
 cargo: 0.29.0
 
@@ -34,4 +34,4 @@ cargo: 0.29.0
 # looking at a beta source tarball and it's uncommented we'll shortly comment it
 # out.
 
-dev: 1
+#dev: 1