std::io: Modify some ReadBuf method signatures to return `&mut Self`
This allows using `ReadBuf` in a builder-like style and to setup a `ReadBuf` and
pass it to `read_buf` in a single expression, e.g.,
```
// With this PR:
reader.read_buf(ReadBuf::uninit(buf).assume_init(init_len))?;
// Previously:
let mut buf = ReadBuf::uninit(buf);
buf.assume_init(init_len);
reader.read_buf(&mut buf)?;
```
r? `@sfackler`
cc https://github.com/rust-lang/rust/issues/78485, https://github.com/rust-lang/rust/issues/94741
Add the Provider api to core::any
This is an implementation of [RFC 3192](https://github.com/rust-lang/rfcs/pull/3192) ~~(which is yet to be merged, thus why this is a draft PR)~~. It adds an API for type-driven requests and provision of data from trait objects. A primary use case is for the `Error` trait, though that is not implemented in this PR. The only major difference to the RFC is that the functionality is added to the `any` module, rather than being in a sibling `provide_any` module (as discussed in the RFC thread).
~~Still todo: improve documentation on items, including adding examples.~~
cc `@yaahc`
The unused_macro_rules lint had a bug where it would regard all rules of
a macro as unused if one rule were malformed. This bug doesn't exist
with the unused_macros lint. To ensure it doesn't appear in the future,
we add a test for it.
Prior to this commit, if a macro had any malformed rules, all rules would
be reported as unused, regardless of whether they were used or not.
So we just turn off unused rule checking completely for macros with
malformed rules.
The very point of compile_error! is to never be reached, and one of
the use cases of the macro, currently also listed as examples in the
documentation of compile_error, is to create nicer errors for wrong
macro invocations. Thus, we shuuld never warn about unused macro arms
that contain invocations of compile_error.
This is a debug setting. We should only make debug builds if user requests
a debug build. Currently this is inserted in release builds.
Furthermore, it would be better to insert these settings in --pre-link-args
because then it would be possible to override them if appropriate. Because
these are inserted at the end, it is necessary to patch emscripten to remove
them.
Revert "remove num_cpus dependency" in rustc and update cargo
Fixes#97549. This PR reverts #94524 and does a Cargo update to pull in rust-lang/cargo#10737.
Rust 1.61.0 has a regression in which it misidentifies the number of available CPUs in some environments, leading to enormously increased memory usage and failing builds. In between Rust 1.60 and 1.61 both rustc and cargo replaced some uses of `num_cpus` with `available_parallelism`, which eliminated support for cgroupv1, still apparently in common use. This PR switches both rustc and cargo back to using `num_cpus` in order to support environments where the available parallelism is controlled by cgroupv1. Both can use `available_parallism` again once it handles cgroupv1 (if ever).
I have confirmed that the rustc part of this PR fixes the memory usage regression in my non-Cargo environment, and others have confirmed in #97549 that the Cargo regression was at fault for the memory usage regression in their environments.
Relax mipsel-sony-psp's linker script
Previously, the linker script forcefully kept all `.lib.stub` sections, unnecessarily bloating the binary. Now, the script is LTO and `--gc-sections` friendly.
`--nmagic` was also added to the linker, because page alignment is not required on the PSP. This further reduces binary size.
Accompanying changes for the `psp` crate are found in: https://github.com/overdrivenpotato/rust-psp/pull/118
hexagon: adapt test for upstream output changes
The output of IR formatting changed slightly in upstream rev
a0bc67e555f404d0e7ddb2e78cb891d96eaf913d
(https://reviews.llvm.org/D123096). I'm not actually sure what any of
that means, as I don't even know what hexagon is in this context, but
this change allows the test to pass on both old and new LLVMs.
r? ``@nikic``
impl Read and Write for VecDeque<u8>
Implementing `Read` and `Write` for `VecDeque<u8>` fills in the VecDeque api surface where `Vec<u8>` and `Cursor<Vec<u8>>` already impl Read and Write. Not only for completeness, but VecDeque in particular is a very handy mock interface for a TCP echo service, if only it supported Read/Write.
Since this PR is just an impl trait, I don't think there is a way to limit it behind a feature flag, so it's "insta-stable". Please correct me if I'm wrong here, not trying to rush stability.
BTreeSet: avoid intermediate sorting when collecting sorted iterators
As [pointed out by droundy](https://users.rust-lang.org/t/question-about-btreeset-implementation/76427), an obvious optimization is to skip the first step introduced by #88448 (creation of a vector and sorting) and it's easy to do so for btree's own iterators. Also, exploit `from` in the examples.
optimize `superset` method of `IntervalSet`
Given that intervals in the `IntervalSet` are sorted and strictly separated( it means the `end` of the previous interval will not be equal to the `start` of the next interval), we can reduce the complexity of the `superset` method from O(NMlogN) to O(2N) (N is the number of intervals and M is the length of each interval)
Update minifier version to 0.2.1
This change and these changes come from an idea of `@camelid:` instead of creating a string, we just `write` the type into the file directly.
I don't think it'll have a big impact on perf but it's still a potential small improvement.
r? `@notriddle`
use precise spans for recursive const evaluation
This fixes https://github.com/rust-lang/rust/issues/73283 by using a `TyCtxtAt` with a more precise span when the interpreter recursively calls itself. Hopefully such calls are sufficiently rare that this does not cost us too much performance.
(In theory, cycles can also arise through layout computation, as layout can depend on consts -- but layout computation happens all the time so we'd have to do something to not make this terrible for performance.)
Fix polonius compare mode.
This fixes running compiler tests in `--compare-mode=polonius`. The `-Zborrowck=mir` option was removed in #95565.
r? `@jackh726`
Update books
## nomicon
5 commits in 10d40c59a581c66d8ecd29ad18d410bf97ed524d..3a43983b76174342b7dbd3e12ea2c49f762e52be
2022-05-07 10:45:07 +0900 to 2022-05-30 17:01:30 +0900
- Changes for `c_unwind` (rust-lang/nomicon#365)
- Upgrade actions/checkout to v3 (rust-lang/nomicon#367)
- Clarification of borrowck (rust-lang/nomicon#354)
- Update the now stale warning about `PhantomData<T>` and dropck (rust-lang/nomicon#363)
- Minor language fixes (rust-lang/nomicon#364)
## reference
1 commits in b74825d8f88b685e239ade00f00de68ba4cd63d4..683bfe5cd64d589c6a1645312ab5f93b6385ccbb
2022-05-20 14:30:30 -0700 to 2022-05-27 11:54:20 -0700
- Reflect changes about unsizing casts in const context (rust-lang/reference#1221)
## book
58 commits in b4dd5f00b87190ad5ef42cbc2a88a783c6ae57ef..396fdb69de7fb18f24b15c7ad13491b1c1fa7231
2022-05-24 21:37:06 -0400 to 2022-06-08 10:02:35 -0400
- Make not-equals operator example consistent. Fixesrust-lang/book#3189.
- Propagate nostarch appendix edits to src
- Edits to edits to appendices
- Edits from nostarch for the appendices
- Propagate edits to chapter 20 to src
- Edits to edits of chapter 20
- Update reference to chapter 12 code that was changed
- Edits from nostarch to chapter 20
- Fix spelling mistake
- Propagate ch17 tech review changes to src
- Responses to tech review for ch17
- Chapter 17 tech review comments
- Update dependencies via `cargo update`
- Propagate changes from ch16 tech review to src
- Tech review comments and responses for chapter 16
- Println captures in chapter 15
- Propagate chapter 15 tech review edits to src
- Responses to tech review for chapter 15
- Tech review comments for chapter 15
- Merge branch 'ch14-tr'
- Upgrade to Rust 1.61
- Upgrade to Rust 1.60
- More little improvements to chapter 12
- Update references to ch12 to be Config::build instead of new
- Propagate ch12 tech review edits to src
- Responses to tech review of chapter 12
- Tech review comments of chapter 12
- Show directory layouts including integration test files
- Clarify that integration/doc tests aren't run if unit tests fail
- Propagate ch11 tech review edits to src
- Edits in response to tech review of chapter 11
- Comments from tech review in chapter 11
- Propagate other edits to nostarch
- Adjust listing so error output line numbers match
- Merge remote-tracking branch 'origin/pr/3153' into ch10-tr
- Reword a rewording about lifetimes of values vs references
- Merge remote-tracking branch 'origin/pr/3107' into ch10-tr
- Merge remote-tracking branch 'origin/pr/3104' into ch10-tr
- Propagate ch10 edits to src
- Edits in response to tech review
- Comments from tech review for chapter 10
- New dictionary entries
- Demonstrate a better expect message. Fixesrust-lang/book#2918.
- Propagate tech review ch9 edits to src
- Termination has stabilized! Fixesrust-lang/book#3116.
- Respond to tech review comments to chapter 9
- Comments from tech review on chapter 9
- Propagate changes for ch8 to src
- Clarify that split_whitespace returns an iterator
- Add type annotation in nostarch snapshot too
- Extra-clarity qualification
- Edits to chapter 8 in response to tech review
- Comments from tech review for chapter 8
- Propagate tech review edits to ch06 src
- Responses to tech review comments on chapter 6
- Chapter 6 after tech review
- Snapshot of chapter 1 for nostarch
- src: use TLSv1.3 if we're going to specify at all
## rust-by-example
4 commits in 2ed26865e8c29ef939dc913a97bd321cadd72a9a..dbb7e5e2345ee26199ffba218156b6009016a20c
2022-05-18 17:23:47 -0300 to 2022-06-02 16:30:51 -0300
- Fix typo in Traits → "impl Trait" (rust-lang/rust-by-example#1544)
- doc_testing.md: clarify tests vs doc-tests (rust-lang/rust-by-example#1547)
- unsafe::asm.md: add some explicit declarations (rust-lang/rust-by-example#1548)
- Update dsl.md to remove unnecessary braces (rust-lang/rust-by-example#1543)
## rustc-dev-guide
6 commits in 554c00e4805df7f7bffac7db408437d62d6dfb9a..6e4d6435db89bcc027b1bba9742e4f59666f5412
2022-05-24 17:15:35 -0700 to 2022-06-08 08:06:32 +0900
- Make build scripts and proc macros work with the suggested rust-analyzer config (rust-lang/rustc-dev-guide#1365)
- improve rustc_interface examples a little (rust-lang/rustc-dev-guide#1362)
- Bump regex from 1.4.3 to 1.5.5 in /ci/date-check (rust-lang/rustc-dev-guide#1364)
- Clarify cargo fallback behavior for rustup link (rust-lang/rustc-dev-guide#1273)
- Update rustc-driver related examples
- Triage some date references related to traits
## embedded-book
1 commits in f7cefbb995eec8c6148f213235e9e2e03268e775..cbb494f96da3268c2925bdadc65ca83d42f2d4ef
2022-04-20 10:38:51 +0000 to 2022-05-26 06:58:43 +0000
- Add Chinese translation repository (rust-embedded/book#318)
Suggest using `iter()` or `into_iter()` for `Vec`
We cannot do that for `&Vec` because `#[rustc_on_unimplemented]` is limited (it does not clean generic instantiation for references, only for ADTs).
`@rustbot` label +A-diagnostics
Don't suggest adding `let` in certain `if` conditions
Avoid being too eager to suggest `let` in an `if` condition with an `=`, namely when the LHS of the `=` isn't even valid as a pattern (to a first degree approximation).
This heustic I came up with kinda sucks. Let me know if it needs to be refined.
