consider unnormalized types for implied bounds #99217

lcnr · 2022-07-13T18:13:21Z

extracted, and slightly modified, from #98900

The idea here is that generally, rustc is split into things which can assume its inputs are well formed¹, and things which have verify that themselves.

Generally most predicates should only deal with well formed inputs, e.g. a &'a &'b (): Trait predicate should be able to assume that 'b: 'a holds. Normalization can loosen wf requirements (see #91068) and must therefore not be used in places which still have to check well formedness. The only such place should hopefully be WellFormed predicates

fixes #87748 and #98543

r? @jackh726 cc @rust-lang/types

These places may still encounter non-wf inputs and have to deal with them without causing an ICE as we may check for well formedness out of order. ↩

lcnr · 2022-07-13T18:16:24Z

@bors try @rust-timer queue

rust-timer · 2022-07-13T18:16:25Z

Awaiting bors try build completion.

@rustbot label: S-waiting-on-perf

bors · 2022-07-13T18:16:32Z

⌛ Trying commit be895038d43246cd021446127c60c885e1786435 with merge 77ee4623672f6bca3e33ba60b6479de48d44b1f9...

bors · 2022-07-13T19:45:50Z

☀️ Try build successful - checks-actions
Build commit: 77ee4623672f6bca3e33ba60b6479de48d44b1f9 (77ee4623672f6bca3e33ba60b6479de48d44b1f9)

rust-timer · 2022-07-13T19:45:53Z

Queued 77ee4623672f6bca3e33ba60b6479de48d44b1f9 with parent 42bd138, future comparison URL.

rust-timer · 2022-07-13T21:06:53Z

Finished benchmarking commit (77ee4623672f6bca3e33ba60b6479de48d44b1f9): comparison url.

Instruction count

Primary benchmarks: 😿 relevant regressions found
Secondary benchmarks: 😿 relevant regressions found

	mean¹	max	count²
Regressions 😿 (primary)	0.8%	2.1%	32
Regressions 😿 (secondary)	2.2%	2.7%	10
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	0.8%	2.1%	32

Max RSS (memory usage)

Results

Primary benchmarks: no relevant changes found
Secondary benchmarks: 🎉 relevant improvements found

	mean¹	max	count²
Regressions 😿 (primary)	N/A	N/A	0
Regressions 😿 (secondary)	N/A	N/A	0
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	-2.6%	-3.1%	2
All 😿🎉 (primary)	N/A	N/A	0

Cycles

Results

Primary benchmarks: 😿 relevant regressions found
Secondary benchmarks: 😿 relevant regressions found

	mean¹	max	count²
Regressions 😿 (primary)	1.9%	2.1%	3
Regressions 😿 (secondary)	1.9%	2.0%	2
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	1.9%	2.1%	3

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: S-waiting-on-review -S-waiting-on-perf perf-regression

the arithmetic mean of the percent change ↩ ↩² ↩³
number of relevant changes ↩ ↩² ↩³

jackh726 · 2022-07-14T03:14:33Z

This is a correctness fix, so I'm not super worried about perf here.

We should queue this for crater.

lcnr · 2022-07-14T06:15:46Z

@craterbot check

craterbot · 2022-07-14T06:15:51Z

👌 Experiment pr-99217 created and queued.
🤖 Automatically detected try build 77ee4623672f6bca3e33ba60b6479de48d44b1f9
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-07-22T21:56:00Z

🚧 Experiment pr-99217 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-07-24T18:32:44Z

🚨 Report generation of pr-99217 failed: Failed to upload to "try#77ee4623672f6bca3e33ba60b6479de48d44b1f9/gh/dgodd.pg-broker-rust/log.txt":

ServiceError { err: PutObjectError { kind: Unhandled(Error { code: Some("InternalError"), message: Some("We encountered an internal error. Please try again."), request_id: Some("732FM25JNE50574H"), extras: {"s3_extended_request_id": "ldanb6aQw90cxIE8iFFqR6PyeoQt42XzeAsbsA0LAVFT2dF7LBj8fVMLKdscjYJEhFSd2tBiRKg="} }), meta: Error { code: Some("InternalError"), message: Some("We encountered an internal error. Please try again."), request_id: Some("732FM25JNE50574H"), extras: {"s3_extended_request_id": "ldanb6aQw90cxIE8iFFqR6PyeoQt42XzeAsbsA0LAVFT2dF7LBj8fVMLKdscjYJEhFSd2tBiRKg="} } }, raw: Response { inner: Response { status: 500, version: HTTP/1.1, headers: {"x-amz-request-id": "732FM25JNE50574H", "x-amz-id-2": "ldanb6aQw90cxIE8iFFqR6PyeoQt42XzeAsbsA0LAVFT2dF7LBj8fVMLKdscjYJEhFSd2tBiRKg=", "date": "Sun, 24 Jul 2022 18:32:35 GMT", "server": "AmazonS3", "content-type": "application/xml", "transfer-encoding": "chunked", "connection": "close"}, body: SdkBody { inner: Once(Some(b"<?xml version=\"1.0\" encoding=\"UTF-8\"?><Error><Code>InternalError</Code><Message>We encountered an internal error. Please try again.</Message><RequestId>732FM25JNE50574H</RequestId><HostId>ldanb6aQw90cxIE8iFFqR6PyeoQt42XzeAsbsA0LAVFT2dF7LBj8fVMLKdscjYJEhFSd2tBiRKg=</HostId></Error>")), retryable: true } }, properties: SharedPropertyBag(Mutex { data: PropertyBag, poisoned: false, .. }) } }

🛠️ If the error is fixed use the retry-report command.

🆘 Can someone from the infra team check in on this? @rust-lang/infra
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

Mark-Simulacrum · 2022-07-24T19:01:57Z

@craterbot retry-report

craterbot · 2022-07-24T19:01:59Z

🛠️ Generation of the report for pr-99217 queued again.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-07-25T00:13:31Z

🎉 Experiment pr-99217 is completed!
📊 33 regressed and 22 fixed (239215 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

lcnr · 2022-07-25T06:47:58Z

all of these seems spurious, so this is now ready for review.

going to rebase this later on, I also have an idea on how to reduce the perf impact.

lcnr · 2022-08-09T13:13:30Z

@bors r rollup=never

tagging this as relnotes, though we should try to merge the notes for this with #100046 if that PR also lands in the same cycle.

For users, the important part is that, when using an item, we now error on projections in their signature if they are not well formed, even if they normalize to a well formed type:

trait WithProj {
    type Assoc;
}

impl<'a, T> WithProj for &'a T {
    type Assoc = T;
}

fn foo<'a, T>(_: <&'a T as WithProj>::Assoc) -> &'a () { &() }

fn main() {
    let y = String::new();
    // This previously compiled, it now errors because `&'static &'y str` is not
    // well formed as 'y does not outlive 'static.
    let _: &'static () = foo(y.as_str());
}

This is theoretically a breaking change, but is a necessary soundness fix and no breakage was discovered by crater.

bors · 2022-08-09T13:13:32Z

📌 Commit 8691b96 has been approved by lcnr

It is now in the queue for this repository.

bors · 2022-08-09T16:39:47Z

⌛ Testing commit 8691b96 with merge 63e4312...

bors · 2022-08-09T19:40:01Z

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing 63e4312 to master...

jackh726 · 2022-08-09T20:54:02Z

This should have been r=jackh726, instead of r=lcnr...

rust-timer · 2022-08-09T20:57:18Z

Finished benchmarking commit (63e4312): comparison url.

Instruction count

Primary benchmarks: ❌ relevant regressions found
Secondary benchmarks: ❌ relevant regressions found

	mean¹	max	count²
Regressions ❌ (primary)	0.7%	1.9%	37
Regressions ❌ (secondary)	2.0%	2.4%	11
Improvements ✅ (primary)	N/A	N/A	0
Improvements ✅ (secondary)	N/A	N/A	0
All ❌✅ (primary)	0.7%	1.9%	37

Max RSS (memory usage)

Results

Primary benchmarks: ✅ relevant improvement found
Secondary benchmarks: no relevant changes found

	mean¹	max	count²
Regressions ❌ (primary)	N/A	N/A	0
Regressions ❌ (secondary)	N/A	N/A	0
Improvements ✅ (primary)	-3.0%	-3.0%	1
Improvements ✅ (secondary)	N/A	N/A	0
All ❌✅ (primary)	-3.0%	-3.0%	1

Cycles

Results

Primary benchmarks: mixed results
Secondary benchmarks: ❌ relevant regressions found

	mean¹	max	count²
Regressions ❌ (primary)	2.1%	2.1%	1
Regressions ❌ (secondary)	3.5%	5.4%	7
Improvements ✅ (primary)	-3.2%	-4.4%	2
Improvements ✅ (secondary)	N/A	N/A	0
All ❌✅ (primary)	-1.5%	-4.4%	3

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: perf-regression
cc @rust-lang/wg-compiler-performance

the arithmetic mean of the percent change ↩ ↩² ↩³
number of relevant changes ↩ ↩² ↩³

nnethercote · 2022-08-09T23:06:48Z

going to rebase this later on, I also have an idea on how to reduce the perf impact.

Was the use of FxIndexSet the idea? It looks like the results are slightly better than the original CI perf run, but this is still a clear regression.

jackh726 · 2022-08-10T00:35:11Z

I don't really know what we can do to mitigate this regression. We are doing strictly more work and it's a soundness fix.

Mark-Simulacrum · 2022-08-16T13:01:09Z

@lcnr I'm going to leave this untagged as triaged since I think the FxIndexSet idea hasn't been explored yet.

jackh726 · 2022-08-16T13:33:42Z

@Mark-Simulacrum is that not #99725?

Mark-Simulacrum · 2022-08-16T13:36:23Z

It is, thanks! Marking as triaged then.

Pkgsrc changes: * We now manage to build for mipsel-unknown-netbsd, but despite the target spec saying cpu = "mips3", the compiler manages to emit 64-bit instructions which cause "illegal instruction" error. Will need more work. The mipsel-unknown-netbsd entry is commentd out since there is no 1.64.0 bootstrap. * Managed to retain the build of aarch64_be, llvm needed a patch to avoid use of neon instructions in the BE case (llvm doesn't support use of neon in BE mode). Ref. patch to src/llvm-project/llvm/lib/Support/BLAKE3/blake3_impl.h. * The minimum gcc version is now 7.x, and that includes the cross-compiler for the targets. For i386 this also needs to /usr/include/gcc-7 include files in the target root, because immintrin.h from gcc 5 is not compatible with gcc 7.x. This applies for the targets where we build against a root from netbsd-8 (sparc64, powerpc, i386), and files/gcc-wrap gets a hack for this. * Pick up tweak for -latomic inclusion from rust-lang/rust#104220 and rust-lang/rust#104572 * Retain ability to do 32-bit NetBSD, by changing from 64 to 32 bit types in library/std/src/sys/unix/thread_parker/netbsd.rs. * I've struggled a bit to get the "openssl-src" build with -latomic where it's needed. I introduce "NetBSD-generic32" system type and use it for the NetBSD mipsel target. There is another attempt to do the same in the patch to vendor/openssl-sys/build/main.rs. * Bump bootstraps to 1.64.0, checksum updates. Upstream changes: Version 1.65.0 (2022-11-03) ========================== Language -------- - [Error on `as` casts of enums with `#[non_exhaustive]` variants] (rust-lang/rust#92744) - [Stabilize `let else`](rust-lang/rust#93628) - [Stabilize generic associated types (GATs)] (rust-lang/rust#96709) - [Add lints `let_underscore_drop`, `let_underscore_lock`, and `let_underscore_must_use` from Clippy] (rust-lang/rust#97739) - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")] (rust-lang/rust#99332) - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](rust-lang/rust#98919). Usage of `MaybeUninit` is the correct way to work with uninitialized memory. - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a] (rust-lang/rust#99916) - [Do not allow `Drop` impl on foreign ADTs] (rust-lang/rust#99576) Compiler -------- - [Stabilize -Csplit-debuginfo on Linux] (rust-lang/rust#98051) - [Use niche-filling optimization even when multiple variants have data] (rust-lang/rust#94075) - [Associated type projections are now verified to be well-formed prior to resolving the underlying type] (rust-lang/rust#99217) - [Stringify non-shorthand visibility correctly] (rust-lang/rust#100350) - [Normalize struct field types when unsizing] (rust-lang/rust#101831) - [Update to LLVM 15](rust-lang/rust#99464) - [Fix aarch64 call abi to correctly zeroext when needed] (rust-lang/rust#97800) - [debuginfo: Generalize C -like encoding for enums] (rust-lang/rust#98393) - [Add `special_module_name` lint] (rust-lang/rust#94467) - [Add support for generating unique profraw files by default when using `-C instrument-coverage`] (rust-lang/rust#100384) - [Allow dynamic linking for iOS/tvOS targets] (rust-lang/rust#100636) New targets: - [Add armv4t-none-eabi as a tier 3 target] (rust-lang/rust#100244) - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets] (rust-lang/rust#101025) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Don't generate `PartialEq::ne` in derive(PartialEq)] (rust-lang/rust#98655) - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default] (rust-lang/rust#101325) - [Forbid mixing `System` with direct system allocator calls] (rust-lang/rust#101394) - [Document no support for writing to non-blocking stdio/stderr] (rust-lang/rust#101416) - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](rust-lang/rust#95295) This also changes the safety conditions on `Layout::from_size_align_unchecked`. Stabilized APIs --------------- - [`std::backtrace::Backtrace`] (https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html) - [`Bound::as_ref`] (https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref) - [`std::io::read_to_string`] (https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html) - [`<*const T>::cast_mut`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut) - [`<*mut T>::cast_const`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const) These APIs are now stable in const contexts: - [`<*const T>::offset_from`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from) - [`<*mut T>::offset_from`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from) Cargo ----- - [Apply GitHub fast path even for partial hashes] (rust-lang/cargo#10807) - [Do not add home bin path to PATH if it's already there] (rust-lang/cargo#11023) - [Take priority into account within the pending queue] (rust-lang/cargo#11032). This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds. Compatibility Notes ------------------- - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`] (rust-lang/rust#95295). This also changes the safety conditions on `Layout::from_size_align_unchecked`. - [`PollFn` now only implements `Unpin` if the closure is `Unpin`] (rust-lang/rust#102737). This is a possible breaking change if users were relying on the blanket unpin implementation. See discussion on the PR for details of why this change was made. - [Drop ExactSizeIterator impl from std::char::EscapeAscii] (rust-lang/rust#99880) This is a backwards-incompatible change to the standard library's surface area, but is unlikely to affect real world usage. - [Do not consider a single repeated lifetime eligible for elision in the return type] (rust-lang/rust#103450) This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again. - [Reenable disabled early syntax gates as future-incompatibility lints] (rust-lang/rust#99935) - [Update the minimum external LLVM to 13] (rust-lang/rust#100460) - [Don't duplicate file descriptors into stdio fds] (rust-lang/rust#101426) - [Sunset RLS](rust-lang/rust#100863) - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type] (rust-lang/rust#99784) This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny. - [`llvm-has-rust-patches` allows setting the build system to treat the LLVM as having Rust-specific patches] (rust-lang/rust#101072) This option may need to be set for distributions that are building Rust with a patched LLVM via `llvm-config`, not the built-in LLVM. 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. - [Add `x.sh` and `x.ps1` shell scripts] (rust-lang/rust#99992) - [compiletest: use target cfg instead of hard-coded tables] (rust-lang/rust#100260) - [Use object instead of LLVM for reading bitcode from rlibs] (rust-lang/rust#98100) - [Enable MIR inlining for optimized compilations] (rust-lang/rust#91743) This provides a 3-10% improvement in compiletimes for real world crates. See [perf results] (https://perf.rust-lang.org/compare.html?start=aedf78e56b2279cc869962feac5153b6ba7001ed&end=0075bb4fad68e64b6d1be06bf2db366c30bc75e1&stat=instructions:u).

Pkgsrc changes: * pkglint cleanups, bump bootstrap kits to 1.65.0. * New target: mipsel-unknown-netbsd, for cpu=mips32 with soft-float. * Managed to retain the build of aarch64_be, llvm needed a patch to avoid use of neon instructions in the BE case (llvm doesn't support use of neon in BE mode). Ref. patch to src/llvm-project/llvm/lib/Support/BLAKE3/blake3_impl.h. Also submitted upstream of LLVM to the BLAKE3 maintainers. * The minimum gcc version is now 7.x, and that includes the cross-compiler for the targets. For i386 this also needs to /usr/include/gcc-7 include files in the target root, because immintrin.h from gcc 5 is not compatible with gcc 7.x. This applies for the targets where we build against a root from netbsd-8 (sparc64, powerpc, i386), and files/gcc-wrap gets a hack for this. * Pick up tweak for -latomic inclusion from rust-lang/rust#104220 and rust-lang/rust#104572 * Retain ability to do 32-bit NetBSD, by changing from 64 to 32 bit types in library/std/src/sys/unix/thread_parker/netbsd.rs. * I've tried to get the "openssl-src" build with -latomic where it's needed. I've introduced the "NetBSD-generic32" system type and use it for the NetBSD mipsel target. There is another attempt to do the same in the patch to vendor/openssl-sys/build/main.rs. Upstream changes: Version 1.66.1 (2023-01-10) =========================== - Added validation of SSH host keys for git URLs in Cargo ([CVE-2022-46176](https://www.cve.org/CVERecord?id=CVE-2022-46176)) Version 1.66.0 (2022-12-15) =========================== Language -------- - [Permit specifying explicit discriminants on all `repr(Int)` enums](rust-lang/rust#95710) ```rust #[repr(u8)] enum Foo { A(u8) = 0, B(i8) = 1, C(bool) = 42, } ``` - [Allow transmutes between the same type differing only in lifetimes](rust-lang/rust#101520) - [Change constant evaluation errors from a deny-by-default lint to a hard error](rust-lang/rust#102091) - [Trigger `must_use` on `impl Trait` for supertraits](rust-lang/rust#102287) This makes `impl ExactSizeIterator` respect the existing `#[must_use]` annotation on `Iterator`. - [Allow `..X` and `..=X` in patterns](rust-lang/rust#102275) - [Uplift `clippy::for_loops_over_fallibles` lint into rustc](rust-lang/rust#99696) - [Stabilize `sym` operands in inline assembly](rust-lang/rust#103168) - [Update to Unicode 15](rust-lang/rust#101912) - [Opaque types no longer imply lifetime bounds](rust-lang/rust#95474) This is a soundness fix which may break code that was erroneously relying on this behavior. Compiler -------- - [Add armv5te-none-eabi and thumbv5te-none-eabi tier 3 targets](rust-lang/rust#101329) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. - [Add support for linking against macOS universal libraries](rust-lang/rust#98736) Libraries --------- - [Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds](rust-lang/rust#101040) - [Update to Unicode 15](rust-lang/rust#101821) Stabilized APIs --------------- - [`proc_macro::Span::source_text`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.source_text) - [`uX::{checked_add_signed, overflowing_add_signed, saturating_add_signed, wrapping_add_signed}`](https://doc.rust-lang.org/stable/std/primitive.u8.html#method.checked_add_signed) - [`iX::{checked_add_unsigned, overflowing_add_unsigned, saturating_add_unsigned, wrapping_add_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_add_unsigned) - [`iX::{checked_sub_unsigned, overflowing_sub_unsigned, saturating_sub_unsigned, wrapping_sub_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_sub_unsigned) - [`BTreeSet::{first, last, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.first) - [`BTreeMap::{first_key_value, last_key_value, first_entry, last_entry, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.first_key_value) - [Add `AsFd` implementations for stdio lock types on WASI.](rust-lang/rust#101768) - [`impl TryFrom<Vec<T>> for Box<[T; N]>`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#impl-TryFrom>-for-Box<[T; N], Global>) - [`core::hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html) - [`Duration::try_from_secs_{f32,f64}`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.try_from_secs_f32) - [`Option::unzip`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unzip) - [`std::os::fd`](https://doc.rust-lang.org/stable/std/os/fd/index.html) Rustdoc ------- - [Add Rustdoc warning for invalid HTML tags in the documentation](rust-lang/rust#101720) Cargo ----- - [Added `cargo remove` to remove dependencies from Cargo.toml](https://doc.rust-lang.org/nightly/cargo/commands/cargo-remove.html) - [`cargo publish` now waits for the new version to be downloadable before exiting](rust-lang/cargo#11062) See [detailed release notes](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-166-2022-12-15) for more. Compatibility Notes ------------------- - [Only apply `ProceduralMasquerade` hack to older versions of `rental`](rust-lang/rust#94063) - [Don't export `__heap_base` and `__data_end` on wasm32-wasi.](rust-lang/rust#102385) - [Don't export `__wasm_init_memory` on WebAssembly.](rust-lang/rust#102426) - [Only export `__tls_*` on wasm32-unknown-unknown.](rust-lang/rust#102440) - [Don't link to `libresolv` in libstd on Darwin](rust-lang/rust#102766) - [Update libstd's libc to 0.2.135 (to make `libstd` no longer pull in `libiconv.dylib` on Darwin)](rust-lang/rust#103277) - [Opaque types no longer imply lifetime bounds](rust-lang/rust#95474) This is a soundness fix which may break code that was erroneously relying on this behavior. - [Make `order_dependent_trait_objects` show up in future-breakage reports](rust-lang/rust#102635) - [Change std::process::Command spawning to default to inheriting the parent's signal mask](rust-lang/rust#101077) 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. - [Enable BOLT for LLVM compilation](rust-lang/rust#94381) - [Enable LTO for rustc_driver.so](rust-lang/rust#101403) Version 1.65.0 (2022-11-03) ========================== Language -------- - [Error on `as` casts of enums with `#[non_exhaustive]` variants] (rust-lang/rust#92744) - [Stabilize `let else`](rust-lang/rust#93628) - [Stabilize generic associated types (GATs)] (rust-lang/rust#96709) - [Add lints `let_underscore_drop`, `let_underscore_lock`, and `let_underscore_must_use` from Clippy] (rust-lang/rust#97739) - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")] (rust-lang/rust#99332) - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](rust-lang/rust#98919). Usage of `MaybeUninit` is the correct way to work with uninitialized memory. - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a] (rust-lang/rust#99916) - [Do not allow `Drop` impl on foreign ADTs] (rust-lang/rust#99576) Compiler -------- - [Stabilize -Csplit-debuginfo on Linux] (rust-lang/rust#98051) - [Use niche-filling optimization even when multiple variants have data] (rust-lang/rust#94075) - [Associated type projections are now verified to be well-formed prior to resolving the underlying type] (rust-lang/rust#99217) - [Stringify non-shorthand visibility correctly] (rust-lang/rust#100350) - [Normalize struct field types when unsizing] (rust-lang/rust#101831) - [Update to LLVM 15](rust-lang/rust#99464) - [Fix aarch64 call abi to correctly zeroext when needed] (rust-lang/rust#97800) - [debuginfo: Generalize C -like encoding for enums] (rust-lang/rust#98393) - [Add `special_module_name` lint] (rust-lang/rust#94467) - [Add support for generating unique profraw files by default when using `-C instrument-coverage`] (rust-lang/rust#100384) - [Allow dynamic linking for iOS/tvOS targets] (rust-lang/rust#100636) New targets: - [Add armv4t-none-eabi as a tier 3 target] (rust-lang/rust#100244) - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets] (rust-lang/rust#101025) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Don't generate `PartialEq::ne` in derive(PartialEq)] (rust-lang/rust#98655) - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default] (rust-lang/rust#101325) - [Forbid mixing `System` with direct system allocator calls] (rust-lang/rust#101394) - [Document no support for writing to non-blocking stdio/stderr] (rust-lang/rust#101416) - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](rust-lang/rust#95295) This also changes the safety conditions on `Layout::from_size_align_unchecked`. Stabilized APIs --------------- - [`std::backtrace::Backtrace`] (https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html) - [`Bound::as_ref`] (https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref) - [`std::io::read_to_string`] (https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html) - [`<*const T>::cast_mut`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut) - [`<*mut T>::cast_const`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const) These APIs are now stable in const contexts: - [`<*const T>::offset_from`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from) - [`<*mut T>::offset_from`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from) Cargo ----- - [Apply GitHub fast path even for partial hashes] (rust-lang/cargo#10807) - [Do not add home bin path to PATH if it's already there] (rust-lang/cargo#11023) - [Take priority into account within the pending queue] (rust-lang/cargo#11032). This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds. Compatibility Notes ------------------- - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`] (rust-lang/rust#95295). This also changes the safety conditions on `Layout::from_size_align_unchecked`. - [`PollFn` now only implements `Unpin` if the closure is `Unpin`] (rust-lang/rust#102737). This is a possible breaking change if users were relying on the blanket unpin implementation. See discussion on the PR for details of why this change was made. - [Drop ExactSizeIterator impl from std::char::EscapeAscii] (rust-lang/rust#99880) This is a backwards-incompatible change to the standard library's surface area, but is unlikely to affect real world usage. - [Do not consider a single repeated lifetime eligible for elision in the return type] (rust-lang/rust#103450) This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again. - [Reenable disabled early syntax gates as future-incompatibility lints] (rust-lang/rust#99935) - [Update the minimum external LLVM to 13] (rust-lang/rust#100460) - [Don't duplicate file descriptors into stdio fds] (rust-lang/rust#101426) - [Sunset RLS](rust-lang/rust#100863) - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type] (rust-lang/rust#99784) This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny. - [`llvm-has-rust-patches` allows setting the build system to treat the LLVM as having Rust-specific patches] (rust-lang/rust#101072) This option may need to be set for distributions that are building Rust with a patched LLVM via `llvm-config`, not the built-in LLVM. 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. - [Add `x.sh` and `x.ps1` shell scripts] (rust-lang/rust#99992) - [compiletest: use target cfg instead of hard-coded tables] (rust-lang/rust#100260) - [Use object instead of LLVM for reading bitcode from rlibs] (rust-lang/rust#98100) - [Enable MIR inlining for optimized compilations] (rust-lang/rust#91743) This provides a 3-10% improvement in compiletimes for real world crates. See [perf results] (https://perf.rust-lang.org/compare.html?start=aedf78e56b2279cc869962feac5153b6ba7001ed&end=0075bb4fad68e64b6d1be06bf2db366c30bc75e1&stat=instructions:u).

rust-highfive assigned jackh726 Jul 13, 2022

rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jul 13, 2022

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 13, 2022

lcnr added A-associated-items Area: Associated items such as associated types and consts. A-implied-bounds Area: Related to implied bounds labels Jul 13, 2022

lcnr mentioned this pull request Jul 13, 2022

const_generics: correctly deal with bound variables #98900

Merged

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 13, 2022

rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Jul 13, 2022

craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 14, 2022

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Jul 25, 2022

lcnr force-pushed the implied-bounds-pre-norm branch from be89503 to b9306e1 Compare July 25, 2022 16:18

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Aug 9, 2022

bors added the merged-by-bors This PR was explicitly merged by bors. label Aug 9, 2022

bors merged commit 63e4312 into rust-lang:master Aug 9, 2022

rustbot added this to the 1.65.0 milestone Aug 9, 2022

lcnr deleted the implied-bounds-pre-norm branch August 10, 2022 09:34

Mark-Simulacrum added the perf-regression-triaged The performance regression has been triaged. label Aug 16, 2022

lcnr mentioned this pull request Aug 19, 2022

implied bounds from associated types may not actually get implied pt 2. #98543

Closed

Noratrieb mentioned this pull request Nov 30, 2022

unsoundness relating to WF requirements on trait object types #44454

Closed

lcnr mentioned this pull request Dec 20, 2022

wfcheck: pre-normalization implied bounds are not used. #108638

Open

aliemjay mentioned this pull request Mar 11, 2023

use implied bounds when checking opaque types #106038

Merged

lqd mentioned this pull request Aug 17, 2023

Soundness regression with for<'lt> closure having an implied bound from return type #114936

Closed

lqd mentioned this pull request Nov 6, 2023

ICE: Lifetime issue not detected for GAT #117489

Closed

Jules-Bertholet mentioned this pull request Dec 12, 2023

&'a T → &'static T in safe code #118876

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consider unnormalized types for implied bounds #99217

consider unnormalized types for implied bounds #99217

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Mark-Simulacrum commented Aug 16, 2022

consider unnormalized types for implied bounds #99217

consider unnormalized types for implied bounds #99217

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