Auto merge of rust-lang#72768 - JohnTitor:rollup-6kwokh6, r=JohnTitor

Rollup of 10 pull requests

Successful merges:

 - rust-lang#72033 (Update RELEASES.md for 1.44.0)
 - rust-lang#72162 (Add Extend::{extend_one,extend_reserve})
 - rust-lang#72419 (Miri read_discriminant: return a scalar instead of raw underlying bytes)
 - rust-lang#72621 (Don't bail out of trait selection when predicate references an error)
 - rust-lang#72677 (Fix diagnostics for `@ ..` binding pattern in tuples and tuple structs)
 - rust-lang#72710 (Add test to make sure -Wunused-crate-dependencies works with tests)
 - rust-lang#72724 (Revert recursive `TokenKind::Interpolated` expansion for now)
 - rust-lang#72741 (Remove unused mut from long-linker-command-lines test)
 - rust-lang#72750 (Remove remaining calls to `as_local_node_id`)
 - rust-lang#72752 (remove mk_bool)

Failed merges:

r? @ghost

Cargo.lock

@@ -4144,7 +4144,6 @@ dependencies = [
  "rustc_lexer",
  "rustc_session",
  "rustc_span",
- "smallvec 1.4.0",
  "unicode-normalization",
 ]
 

RELEASES.md

@@ -1,3 +1,163 @@
+Version 1.44.0 (2020-06-04)
+==========================
+
+Language
+--------
+- [You can now use `async/.await` with `#[no_std]` enabled.][69033]
+- [Added the `unused_braces` lint.][70081]
+
+**Syntax-only changes**
+
+- [Expansion-driven outline module parsing][69838]
+```rust
+#[cfg(FALSE)]
+mod foo {
+    mod bar {
+        mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
+    }
+}
+```
+
+These are still rejected semantically, so you will likely receive an error but
+these changes can be seen and parsed by macros and conditional compilation.
+
+Compiler
+--------
+- [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
+  Additionally when in incremental mode rustc defaults to 256 codegen units.
+- [Refactored `catch_unwind`, to have zero-cost unless unwinding is enabled and
+  a panic is thrown.][67502]
+- [Added tier 3\* support for the `aarch64-unknown-none` and
+  `aarch64-unknown-none-softfloat` targets.][68334]
+- [Added tier 3 support for `arm64-apple-tvos` and
+  `x86_64-apple-tvos` targets.][68191]
+
+
+Libraries
+---------
+- [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
+  `vec![]` to be able to be used in `const` contexts.
+- [`convert::Infallible` now implements `Hash`.][70281]
+- [`OsString` now implements `DerefMut` and `IndexMut` returning
+  a `&mut OsStr`.][70048]
+- [Unicode 13 is now supported.][69929]
+- [`String` now implements `From<&mut str>`.][69661]
+- [`IoSlice` now implements `Copy`.][69403]
+- [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is less than 32.
+- [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
+- [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
+  `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
+  integer types.][69373]
+
+Stabilized APIs
+---------------
+- [`PathBuf::with_capacity`]
+- [`PathBuf::capacity`]
+- [`PathBuf::clear`]
+- [`PathBuf::reserve`]
+- [`PathBuf::reserve_exact`]
+- [`PathBuf::shrink_to_fit`]
+- [`f32::to_int_unchecked`]
+- [`f64::to_int_unchecked`]
+- [`Layout::align_to`]
+- [`Layout::pad_to_align`]
+- [`Layout::array`]
+- [`Layout::extend`]
+
+Cargo
+-----
+- [Added the `cargo tree` command which will print a tree graph of
+  your dependencies.][cargo/8062] E.g.
+  ```
+    mdbook v0.3.2 (/Users/src/rust/mdbook)
+  ├── ammonia v3.0.0
+  │   ├── html5ever v0.24.0
+  │   │   ├── log v0.4.8
+  │   │   │   └── cfg-if v0.1.9
+  │   │   ├── mac v0.1.1
+  │   │   └── markup5ever v0.9.0
+  │   │       ├── log v0.4.8 (*)
+  │   │       ├── phf v0.7.24
+  │   │       │   └── phf_shared v0.7.24
+  │   │       │       ├── siphasher v0.2.3
+  │   │       │       └── unicase v1.4.2
+  │   │       │           [build-dependencies]
+  │   │       │           └── version_check v0.1.5
+  ...
+  ```
+
+Misc
+----
+- [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
+  the version in the sidebar.][69494]
+
+Compatibility Notes
+-------------------
+- [Rustc now correctly generates static libraries on Windows GNU targets with
+  the `.a` extension, rather than the previous `.lib`.][70937]
+- [Removed the `-C no_integrated_as` flag from rustc.][70345]
+- [The `file_name` property in JSON output of macro errors now points the actual
+  source file rather than the previous format of `<NAME macros>`.][70969]
+  **Note:** this may not point a file that actually exists on the user's system.
+- [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
+- [`mem::{zeroed, uninitialised, MaybeUninit}` will now panic when used with types
+  that do not allow zero initialization such as `NonZeroU8`.][66059] This was
+  previously a warning.
+- [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
+  operator has been defined as a saturating operation.][71269] This was previously
+  undefined behaviour, you can use the `{f64, f32}::to_int_unchecked` methods to
+  continue using the current behaviour which may desirable in rare performance
+  sensitive situations.
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc and
+related tools.
+
+- [dep_graph Avoid allocating a set on when the number reads are small.][69778]
+- [Replace big JS dict with JSON parsing.][71250]
+
+[69373]: https://github.com/rust-lang/rust/pull/69373/
+[66059]: https://github.com/rust-lang/rust/pull/66059/
+[68191]: https://github.com/rust-lang/rust/pull/68191/
+[68899]: https://github.com/rust-lang/rust/pull/68899/
+[71147]: https://github.com/rust-lang/rust/pull/71147/
+[71250]: https://github.com/rust-lang/rust/pull/71250/
+[70937]: https://github.com/rust-lang/rust/pull/70937/
+[70969]: https://github.com/rust-lang/rust/pull/70969/
+[70632]: https://github.com/rust-lang/rust/pull/70632/
+[70281]: https://github.com/rust-lang/rust/pull/70281/
+[70345]: https://github.com/rust-lang/rust/pull/70345/
+[70048]: https://github.com/rust-lang/rust/pull/70048/
+[70081]: https://github.com/rust-lang/rust/pull/70081/
+[70156]: https://github.com/rust-lang/rust/pull/70156/
+[71269]: https://github.com/rust-lang/rust/pull/71269/
+[69838]: https://github.com/rust-lang/rust/pull/69838/
+[69929]: https://github.com/rust-lang/rust/pull/69929/
+[69661]: https://github.com/rust-lang/rust/pull/69661/
+[69778]: https://github.com/rust-lang/rust/pull/69778/
+[69494]: https://github.com/rust-lang/rust/pull/69494/
+[69403]: https://github.com/rust-lang/rust/pull/69403/
+[69033]: https://github.com/rust-lang/rust/pull/69033/
+[68692]: https://github.com/rust-lang/rust/pull/68692/
+[68334]: https://github.com/rust-lang/rust/pull/68334/
+[67502]: https://github.com/rust-lang/rust/pull/67502/
+[cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
+[`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
+[`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
+[`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
+[`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
+[`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
+[`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
+[`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
+[`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
+[`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
+[`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
+[`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
+[`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
+
+
 Version 1.43.1 (2020-05-07)
 ===========================
 

src/liballoc/collections/binary_heap.rs

@@ -1376,6 +1376,16 @@ impl<T: Ord> Extend<T> for BinaryHeap<T> {
     fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
         <Self as SpecExtend<I>>::spec_extend(self, iter);
     }
+
+    #[inline]
+    fn extend_one(&mut self, item: T) {
+        self.push(item);
+    }
+
+    #[inline]
+    fn extend_reserve(&mut self, additional: usize) {
+        self.reserve(additional);
+    }
 }
 
 impl<T: Ord, I: IntoIterator<Item = T>> SpecExtend<I> for BinaryHeap<T> {
@@ -1406,4 +1416,14 @@ impl<'a, T: 'a + Ord + Copy> Extend<&'a T> for BinaryHeap<T> {
     fn extend<I: IntoIterator<Item = &'a T>>(&mut self, iter: I) {
         self.extend(iter.into_iter().cloned());
     }
+
+    #[inline]
+    fn extend_one(&mut self, &item: &'a T) {
+        self.push(item);
+    }
+
+    #[inline]
+    fn extend_reserve(&mut self, additional: usize) {
+        self.reserve(additional);
+    }
 }

src/liballoc/collections/btree/map.rs

@@ -1901,13 +1901,23 @@ impl<K: Ord, V> Extend<(K, V)> for BTreeMap<K, V> {
             self.insert(k, v);
         });
     }
+
+    #[inline]
+    fn extend_one(&mut self, (k, v): (K, V)) {
+        self.insert(k, v);
+    }
 }
 
 #[stable(feature = "extend_ref", since = "1.2.0")]
 impl<'a, K: Ord + Copy, V: Copy> Extend<(&'a K, &'a V)> for BTreeMap<K, V> {
     fn extend<I: IntoIterator<Item = (&'a K, &'a V)>>(&mut self, iter: I) {
         self.extend(iter.into_iter().map(|(&key, &value)| (key, value)));
     }
+
+    #[inline]
+    fn extend_one(&mut self, (&k, &v): (&'a K, &'a V)) {
+        self.insert(k, v);
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

src/liballoc/collections/btree/set.rs

@@ -1152,13 +1152,23 @@ impl<T: Ord> Extend<T> for BTreeSet<T> {
             self.insert(elem);
         });
     }
+
+    #[inline]
+    fn extend_one(&mut self, elem: T) {
+        self.insert(elem);
+    }
 }
 
 #[stable(feature = "extend_ref", since = "1.2.0")]
 impl<'a, T: 'a + Ord + Copy> Extend<&'a T> for BTreeSet<T> {
     fn extend<I: IntoIterator<Item = &'a T>>(&mut self, iter: I) {
         self.extend(iter.into_iter().cloned());
     }
+
+    #[inline]
+    fn extend_one(&mut self, &elem: &'a T) {
+        self.insert(elem);
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

src/liballoc/collections/linked_list.rs

@@ -1748,6 +1748,11 @@ impl<T> Extend<T> for LinkedList<T> {
     fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
         <Self as SpecExtend<I>>::spec_extend(self, iter);
     }
+
+    #[inline]
+    fn extend_one(&mut self, elem: T) {
+        self.push_back(elem);
+    }
 }
 
 impl<I: IntoIterator> SpecExtend<I> for LinkedList<I::Item> {
@@ -1767,6 +1772,11 @@ impl<'a, T: 'a + Copy> Extend<&'a T> for LinkedList<T> {
     fn extend<I: IntoIterator<Item = &'a T>>(&mut self, iter: I) {
         self.extend(iter.into_iter().cloned());
     }
+
+    #[inline]
+    fn extend_one(&mut self, &elem: &'a T) {
+        self.push_back(elem);
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

src/liballoc/collections/vec_deque.rs

@@ -2881,13 +2881,33 @@ impl<A> Extend<A> for VecDeque<A> {
             }
         }
     }
+
+    #[inline]
+    fn extend_one(&mut self, elem: A) {
+        self.push_back(elem);
+    }
+
+    #[inline]
+    fn extend_reserve(&mut self, additional: usize) {
+        self.reserve(additional);
+    }
 }
 
 #[stable(feature = "extend_ref", since = "1.2.0")]
 impl<'a, T: 'a + Copy> Extend<&'a T> for VecDeque<T> {
     fn extend<I: IntoIterator<Item = &'a T>>(&mut self, iter: I) {
         self.extend(iter.into_iter().cloned());
     }
+
+    #[inline]
+    fn extend_one(&mut self, &elem: &T) {
+        self.push_back(elem);
+    }
+
+    #[inline]
+    fn extend_reserve(&mut self, additional: usize) {
+        self.reserve(additional);
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

src/liballoc/lib.rs

@@ -93,6 +93,7 @@
 #![feature(container_error_extra)]
 #![feature(dropck_eyepatch)]
 #![feature(exact_size_is_empty)]
+#![feature(extend_one)]
 #![feature(fmt_internals)]
 #![feature(fn_traits)]
 #![feature(fundamental)]

src/liballoc/string.rs

@@ -1799,34 +1799,69 @@ impl Extend<char> for String {
         self.reserve(lower_bound);
         iterator.for_each(move |c| self.push(c));
     }
+
+    #[inline]
+    fn extend_one(&mut self, c: char) {
+        self.push(c);
+    }
+
+    #[inline]
+    fn extend_reserve(&mut self, additional: usize) {
+        self.reserve(additional);
+    }
 }
 
 #[stable(feature = "extend_ref", since = "1.2.0")]
 impl<'a> Extend<&'a char> for String {
     fn extend<I: IntoIterator<Item = &'a char>>(&mut self, iter: I) {
         self.extend(iter.into_iter().cloned());
     }
+
+    #[inline]
+    fn extend_one(&mut self, &c: &'a char) {
+        self.push(c);
+    }
+
+    #[inline]
+    fn extend_reserve(&mut self, additional: usize) {
+        self.reserve(additional);
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a> Extend<&'a str> for String {
     fn extend<I: IntoIterator<Item = &'a str>>(&mut self, iter: I) {
         iter.into_iter().for_each(move |s| self.push_str(s));
     }
+
+    #[inline]
+    fn extend_one(&mut self, s: &'a str) {
+        self.push_str(s);
+    }
 }
 
 #[stable(feature = "extend_string", since = "1.4.0")]
 impl Extend<String> for String {
     fn extend<I: IntoIterator<Item = String>>(&mut self, iter: I) {
         iter.into_iter().for_each(move |s| self.push_str(&s));
     }
+
+    #[inline]
+    fn extend_one(&mut self, s: String) {
+        self.push_str(&s);
+    }
 }
 
 #[stable(feature = "herd_cows", since = "1.19.0")]
 impl<'a> Extend<Cow<'a, str>> for String {
     fn extend<I: IntoIterator<Item = Cow<'a, str>>>(&mut self, iter: I) {
         iter.into_iter().for_each(move |s| self.push_str(&s));
     }
+
+    #[inline]
+    fn extend_one(&mut self, s: Cow<'a, str>) {
+        self.push_str(&s);
+    }
 }
 
 /// A convenience impl that delegates to the impl for `&str`.