Rollup of 6 pull requests

README.md

@@ -22,8 +22,9 @@ Read ["Installation"] from [The Book].
 
 The Rust build system uses a Python script called `x.py` to build the compiler,
 which manages the bootstrapping process. It lives at the root of the project.
-It also uses a file named `config.toml` to determine various configuration settings for the build.
-You can see a full list of options in `config.example.toml`.
+It also uses a file named `config.toml` to determine various configuration
+settings for the build. You can see a full list of options in
+`config.example.toml`.
 
 The `x.py` command can be run directly on most Unix systems in the following
 format:
@@ -33,7 +34,8 @@ format:
 ```
 
 This is how the documentation and examples assume you are running `x.py`.
-See the [rustc dev guide][rustcguidebuild] if this does not work on your platform.
+See the [rustc dev guide][rustcguidebuild] if this does not work on your
+platform.
 
 More information about `x.py` can be found by running it with the `--help` flag
 or reading the [rustc dev guide][rustcguidebuild].
@@ -105,24 +107,26 @@ See [the rustc-dev-guide for more info][sysllvm].
 
    When complete, `./x.py install` will place several programs into
    `$PREFIX/bin`: `rustc`, the Rust compiler, and `rustdoc`, the
-   API-documentation tool. By default, it will also include [Cargo], Rust's package manager.
-   You can disable this behavior by passing `--set build.extended=false` to `./configure`.
+   API-documentation tool. By default, it will also include [Cargo], Rust's
+   package manager. You can disable this behavior by passing
+   `--set build.extended=false` to `./configure`.
 
 [Cargo]: https://github.com/rust-lang/cargo
 
 #### Configure and Make
 
-This project provides a configure script and makefile (the latter of which just invokes `x.py`).
-`./configure` is the recommended way to programatically generate a `config.toml`. `make` is not
-recommended (we suggest using `x.py` directly), but it is supported and we try not to break it
-unnecessarily.
+This project provides a configure script and makefile (the latter of which just
+invokes `x.py`). `./configure` is the recommended way to programatically
+generate a `config.toml`. `make` is not recommended (we suggest using `x.py`
+directly), but it is supported and we try not to break it unnecessarily.
 
 ```sh
 ./configure
 make && sudo make install
 ```
 
-`configure` generates a `config.toml` which can also be used with normal `x.py` invocations.
+`configure` generates a `config.toml` which can also be used with normal `x.py`
+invocations.
 
 ### Building on Windows
 
@@ -193,7 +197,7 @@ toolchain.
 #### MSVC
 
 MSVC builds of Rust additionally require an installation of Visual Studio 2017
-(or later) so `rustc` can use its linker.  The simplest way is to get
+(or later) so `rustc` can use its linker. The simplest way is to get
 [Visual Studio], check the "C++ build tools" and "Windows 10 SDK" workload.
 
 [Visual Studio]: https://visualstudio.microsoft.com/downloads/
@@ -234,7 +238,8 @@ Windows build triples are:
 
 The build triple can be specified by either specifying `--build=<triple>` when
 invoking `x.py` commands, or by creating a `config.toml` file (as described in
-[Building on a Unix-like system](#building-on-a-unix-like-system)), and passing `--set build.build=<triple>` to `./configure`.
+[Building on a Unix-like system](#building-on-a-unix-like-system)), and passing
+`--set build.build=<triple>` to `./configure`.
 
 ## Building Documentation
 

RELEASES.md

@@ -1,3 +1,146 @@
+Version 1.71.0 (2023-07-13)
+==========================
+
+<a id="1.71.0-Language"></a>
+
+Language
+--------
+
+- [Stabilize `raw-dylib`, `link_ordinal`, `import_name_type` and `-Cdlltool`.](https://github.com/rust-lang/rust/pull/109677/)
+- [Uplift `clippy::{drop,forget}_{ref,copy}` lints.](https://github.com/rust-lang/rust/pull/109732/)
+- [Type inference is more conservative around constrained vars.](https://github.com/rust-lang/rust/pull/110100/)
+- [Use fulfillment to check `Drop` impl compatibility](https://github.com/rust-lang/rust/pull/110577/)
+
+<a id="1.71.0-Compiler"></a>
+
+Compiler
+--------
+
+- [Evaluate place expression in `PlaceMention`](https://github.com/rust-lang/rust/pull/104844/),
+  making `let _ =` patterns more consistent with respect to the borrow checker.
+- [Add `--print deployment-target` flag for Apple targets.](https://github.com/rust-lang/rust/pull/105354/)
+- [Stabilize `extern "C-unwind"` and friends.](https://github.com/rust-lang/rust/pull/106075/)
+  The existing `extern "C"` etc. may change behavior for cross-language unwinding in a future release.
+- [Update the version of musl used on `*-linux-musl` targets to 1.2.3](https://github.com/rust-lang/rust/pull/107129/),
+  enabling [time64](https://musl.libc.org/time64.html) on 32-bit systems.
+- [Stabilize `debugger_visualizer`](https://github.com/rust-lang/rust/pull/108668/)
+  for embedding metadata like Microsoft's Natvis.
+- [Enable flatten-format-args by default.](https://github.com/rust-lang/rust/pull/109999/)
+- [Make `Self` respect tuple constructor privacy.](https://github.com/rust-lang/rust/pull/111245/)
+- [Improve niche placement by trying two strategies and picking the better result.](https://github.com/rust-lang/rust/pull/108106/)
+- [Use `apple-m1` as the target CPU for `aarch64-apple-darwin`.](https://github.com/rust-lang/rust/pull/109899/)
+- [Add Tier 3 support for the `x86_64h-apple-darwin` target.](https://github.com/rust-lang/rust/pull/108795/)
+- [Promote `loongarch64-unknown-linux-gnu` to Tier 2 with host tools.](https://github.com/rust-lang/rust/pull/110936/)
+
+Refer to Rust's [platform support page][platform-support-doc]
+for more information on Rust's tiered platform support.
+
+<a id="1.71.0-Libraries"></a>
+
+Libraries
+---------
+- [Rework handling of recursive panics.](https://github.com/rust-lang/rust/pull/110975/)
+  Additional panics are allowed while unwinding, as long as they are caught before escaping
+  a `Drop` implementation, but panicking within a panic hook is now an immediate abort.
+- [Loosen `From<&[T]> for Box<[T]>` bound to `T: Clone`.](https://github.com/rust-lang/rust/pull/103406/)
+- [Remove unnecessary `T: Send` bound](https://github.com/rust-lang/rust/pull/111134/)
+  in `Error for mpsc::SendError<T>` and `TrySendError<T>`.
+- [Fix docs for `alloc::realloc`](https://github.com/rust-lang/rust/pull/108630/)
+  to match `Layout` requirements that the size must not exceed `isize::MAX`.
+- [Document `const {}` syntax for `std::thread_local`.](https://github.com/rust-lang/rust/pull/110620/)
+  This syntax was stabilized in Rust 1.59, but not previously mentioned in release notes.
+
+<a id="1.71.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`CStr::is_empty`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.is_empty)
+- [`BuildHasher::hash_one`](https://doc.rust-lang.org/stable/std/hash/trait.BuildHasher.html#method.hash_one)
+- [`NonZeroI*::is_positive`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_positive)
+- [`NonZeroI*::is_negative`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_negative)
+- [`NonZeroI*::checked_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.checked_neg)
+- [`NonZeroI*::overflowing_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.overflowing_neg)
+- [`NonZeroI*::saturating_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.saturating_neg)
+- [`NonZeroI*::wrapping_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.wrapping_neg)
+- [`Neg for NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-NonZeroI32)
+- [`Neg for &NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-%26NonZeroI32)
+- [`From<[T; N]> for (T...)`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C%5BT;+1%5D%3E-for-(T,))
+  (array to N-tuple for N in 1..=12)
+- [`From<(T...)> for [T; N]`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C(T,)%3E-for-%5BT;+1%5D)
+  (N-tuple to array for N in 1..=12)
+- [`windows::io::AsHandle for Box<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Box%3CT%3E)
+- [`windows::io::AsHandle for Rc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Rc%3CT%3E)
+- [`windows::io::AsHandle for Arc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Arc%3CT%3E)
+- [`windows::io::AsSocket for Box<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Box%3CT%3E)
+- [`windows::io::AsSocket for Rc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Rc%3CT%3E)
+- [`windows::io::AsSocket for Arc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Arc%3CT%3E)
+
+These APIs are now stable in const contexts:
+
+- [`<*const T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read)
+- [`<*const T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned)
+- [`<*mut T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read-1)
+- [`<*mut T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned-1)
+- [`ptr::read`](https://doc.rust-lang.org/stable/std/ptr/fn.read.html)
+- [`ptr::read_unaligned`](https://doc.rust-lang.org/stable/std/ptr/fn.read_unaligned.html)
+- [`<[T]>::split_at`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_at)
+
+<a id="1.71.0-Cargo"></a>
+
+Cargo
+-----
+- [Allow named debuginfo options in `Cargo.toml`.](https://github.com/rust-lang/cargo/pull/11958/)
+- [Add `workspace_default_members` to the output of `cargo metadata`.](https://github.com/rust-lang/cargo/pull/11978/)
+- [`cargo add` now considers `rust-version` when selecting packages.](https://github.com/rust-lang/cargo/pull/12078/)
+- [Automatically inherit workspace fields when running `cargo new`/`cargo init`.](https://github.com/rust-lang/cargo/pull/12069/)
+
+<a id="1.71.0-Rustdoc"></a>
+
+Rustdoc
+-------
+
+- [Add a new `rustdoc::unescaped_backticks` lint for broken inline code.](https://github.com/rust-lang/rust/pull/105848/)
+- [Support strikethrough with single tildes.](https://github.com/rust-lang/rust/pull/111152/) (`~~old~~` vs. `~new~`)
+
+<a id="1.71.0-Misc"></a>
+
+Misc
+----
+
+<a id="1.71.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [Remove structural match from `TypeId`.](https://github.com/rust-lang/rust/pull/103291/)
+  Code that uses a constant `TypeId` in a pattern will potentially be broken.
+  Known cases have already been fixed -- in particular, users of the `log`
+  crate's `kv_unstable` feature should update to `log v0.4.18` or later.
+- [Add a `sysroot` crate to represent the standard library crates.](https://github.com/rust-lang/rust/pull/108865/)
+  This does not affect stable users, but may require adjustment in tools that build their own standard library.
+- [Cargo optimizes its usage under `rustup`.](https://github.com/rust-lang/cargo/pull/11917/) When
+  Cargo detects it will run `rustc` pointing to a rustup proxy, it'll try bypassing the proxy and
+  use the underlying binary directly. There are assumptions around the interaction with rustup and
+  `RUSTUP_TOOLCHAIN`. However, it's not expected to affect normal users.
+- [When querying a package, Cargo tries only the original name, all hyphens, and all underscores to
+  handle misspellings.](https://github.com/rust-lang/cargo/pull/12083/) Previously, Cargo tried each
+  combination of hyphens and underscores, causing excessive requests to crates.io.
+- Cargo now [disallows `RUSTUP_HOME`](https://github.com/rust-lang/cargo/pull/12101/) and
+  [`RUSTUP_TOOLCHAIN`](https://github.com/rust-lang/cargo/pull/12107/) in the `[env]` configuration
+  table. This is considered to be not a use case Cargo would like to support, since it will likely
+  cause problems or lead to confusion.
+
+<a id="1.71.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+
 Version 1.70.0 (2023-06-01)
 ==========================
 

compiler/rustc_mir_build/src/thir/cx/expr.rs

@@ -215,17 +215,18 @@ impl<'tcx> Cx<'tcx> {
             // so we wouldn't have to compute and store the actual value
 
             let hir::ExprKind::Path(ref qpath) = source.kind else {
-                return ExprKind::Cast { source: self.mirror_expr(source)};
+                return ExprKind::Cast { source: self.mirror_expr(source) };
             };
 
             let res = self.typeck_results().qpath_res(qpath, source.hir_id);
             let ty = self.typeck_results().node_type(source.hir_id);
             let ty::Adt(adt_def, substs) = ty.kind() else {
-                return ExprKind::Cast { source: self.mirror_expr(source)};
+                return ExprKind::Cast { source: self.mirror_expr(source) };
             };
 
-            let Res::Def(DefKind::Ctor(CtorOf::Variant, CtorKind::Const), variant_ctor_id) = res else {
-                return ExprKind::Cast { source: self.mirror_expr(source)};
+            let Res::Def(DefKind::Ctor(CtorOf::Variant, CtorKind::Const), variant_ctor_id) = res
+            else {
+                return ExprKind::Cast { source: self.mirror_expr(source) };
             };
 
             let idx = adt_def.variant_index_with_ctor_id(variant_ctor_id);
@@ -358,19 +359,35 @@ impl<'tcx> Cx<'tcx> {
                             });
                         }
                     }
-                    let adt_data =
-                        if let hir::ExprKind::Path(hir::QPath::Resolved(_, ref path)) = fun.kind {
-                            // Tuple-like ADTs are represented as ExprKind::Call. We convert them here.
-                            expr_ty.ty_adt_def().and_then(|adt_def| match path.res {
-                                Res::Def(DefKind::Ctor(_, CtorKind::Fn), ctor_id) => {
+
+                    // Tuple-like ADTs are represented as ExprKind::Call. We convert them here.
+                    let adt_data = if let hir::ExprKind::Path(ref qpath) = fun.kind
+                    && let Some(adt_def) = expr_ty.ty_adt_def() {
+                        match qpath {
+                            hir::QPath::Resolved(_, ref path) => {
+                                match path.res {
+                                    Res::Def(DefKind::Ctor(_, CtorKind::Fn), ctor_id) => {
+                                        Some((adt_def, adt_def.variant_index_with_ctor_id(ctor_id)))
+                                    }
+                                    Res::SelfCtor(..) => Some((adt_def, FIRST_VARIANT)),
+                                    _ => None,
+                                }
+                            }
+                            hir::QPath::TypeRelative(_ty, _) => {
+                                if let Some((DefKind::Ctor(_, CtorKind::Fn), ctor_id)) =
+                                    self.typeck_results().type_dependent_def(fun.hir_id)
+                                {
                                     Some((adt_def, adt_def.variant_index_with_ctor_id(ctor_id)))
+                                } else {
+                                    None
                                 }
-                                Res::SelfCtor(..) => Some((adt_def, FIRST_VARIANT)),
-                                _ => None,
-                            })
-                        } else {
-                            None
-                        };
+
+                            }
+                            _ => None,
+                        }
+                    } else {
+                        None
+                    };
                     if let Some((adt_def, index)) = adt_data {
                         let substs = self.typeck_results().node_substs(fun.hir_id);
                         let user_provided_types = self.typeck_results().user_provided_types();