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This does not yet handle the case of mixed deref patterns with normal
constructors; it'll ICE in `Constructor::is_covered_by`. That'll be
fixed in a later commit.
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The 2 commands do the same thing.
Also, follow style used elsewhere in the guide.
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`deref_patterns`: let string and byte string literal patterns peel references and smart pointers before matching
This follows up on #140028. Together, they allow using string and byte string literal patterns to match on smart pointers when `deref_patterns` is enabled. In particular, string literals can now match on `String`, subsuming the functionality of the `string_deref_patterns` feature.
More generally, this works by letting literals peel references (and smart pointers) before matching, similar to most other patterns, providing an answer to #44849. Though it's only partially implemented at this point: this doesn't yet let named const patterns peel before matching. The peeling logic is general enough to support named consts, but the typing rules for named const patterns would need adjustments to feel consistent (e.g. arrays would need rules to be usable as slices, and `const STR: &'static str` wouldn't be able to match on a `String` unless a rule was added to let it be used where a `str` is expected, similar to what #140028 did for literals).
This also allows string and byte string patterns to match on mutable references, following up on https://github.com/rust-lang/rust/pull/140028#discussion_r2053927512. Rather than forward the mutability of the scrutinee to literal patterns, I've opted to peel `&mut`s from the scrutinee. From a design point of view, this makes the behavior consistent with what would be expected from deref coercions using the methodology in the next paragraph. From a diagnostics point of view, this avoids labeling string and byte string patterns as "mutable references", which I think could be confusing. See [`byte-string-type-errors.rs`](https://github.com/rust-lang/rust/compare/master...dianne:rust:lit-deref-pats-p2?expand=1#diff-4a0dd9b164b67c706751f3c0b5762ddab08bcef05a91972beb0190c6c1cd3706) for how the diagnostics look.
At a high level, the peeling logic implemented here tries to mimic how deref coercions work for expressions: we peel references (and smart pointers) from the scrutinee until the pattern can match against it, and no more. This is primarily tested by [`const-pats-do-not-mislead-inference.rs`](https://github.com/rust-lang/rust/compare/master...dianne:rust:lit-deref-pats-p2?expand=1#diff-19afc05b8aae9a30fe4a3a8c0bc2ab2c56b58755a45cdf5c12be0d5e83c4739d). To illustrate the connection, I wasn't sure if this made sense to include in the test file, but I've translated those tests to make sure they give the same inference results as deref coercions: [(playground)](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=1869744cb9cdfed71a686990aadf9fe1). In each case, a reference to the scrutinee is coerced to have the type of the pattern (under a reference).
Tracking issue for deref patterns: #87121
r? `@oli-obk`
cc `@Nadrieril`
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r=jieyouxu,wesleywiser
Implement RFC 3503: frontmatters
Tracking issue: #136889
Supercedes #137193. This implements [RFC 3503](https://github.com/rust-lang/rfcs/blob/master/text/3503-frontmatter.md).
This might break rust-analyzer. Will look into how to fix that.
Suggestions welcome for how to improve diagnostics.
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Supercedes #137193
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and migrate most of remaining `error-pattern`s to it.
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Rustc pull update
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unstable-book: fix capitalization
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Also, these are normal Rust things (crates/packages), so remove the word *normal*.
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Update compiler-src.md
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Introduce a normalization chapter
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Refactor the dependency structure from a nested unordered list to a single-level ordered list.
IMO, this is clearer, but happy to close this PR without merging, if the change is not desired.
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allow deref patterns to move out of boxes
This adds a case to lower deref patterns on boxes using a built-in deref instead of a `Deref::deref` or `DerefMut::deref_mut` call: if `deref!(inner): Box<T>` is matching on place `place`, the inner pattern `inner` now matches on `*place` rather than a temporary. No longer needing to call a method also means it won't borrow the scrutinee in match arms. This allows for bindings in `inner` to move out of `*place`.
For comparison with box patterns, this uses the same MIR lowering but different THIR. Consequently, deref patterns on boxes are treated the same as any other deref patterns in match exhaustiveness analysis. Box patterns can't quite be implemented in terms of deref patterns until exhaustiveness checking for deref patterns is implemented (I'll open a PR for exhaustiveness soon!).
Tracking issue: #87121
r? ``@Nadrieril``
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This adds documentation on how to stabilize the edition in the compiler.
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This updates to the latest version of mdbook which has had a variety
of fixes of new features since the last update.
Changelog: https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0448
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Based on lessons learned from 2024. There's probably still more details
to say here since it was a ton of work. These are the major points that
I remember.
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It was observed that some people were missing the `edition20xx` rustdoc
attribute. Although this probably won't solve that problem, I'd still
like to highlight it as something to be aware of.
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rustc-dev-guide subtree update
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I found "Rustc dev guide subtree update awkward"
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fix(test): Expose '--no-capture' in favor of `--nocapture`
This improves consistency with commonly expected CLI conventions,
avoiding a common stutter people make when running tests (trying what
they expect and then having to check the docs to then user whats
accepted).
An alternative could have been to take a value, like `--capture <value>` (e.g. `pytest` does this).
Overall, we're shifting focus for features to custom test harnesses (see #134283).
Most of `pytest`s modes will likely be irrelevant in that situation.
As for the rest, its too early to tell which, if any, may be relevant,
so we're sticking with this small, quality of life improvement.
I expect we'll warn about `--nocapture` being deprecated in the future after a sufficient transition period has been allowed.
By deprecating `--nocapture`, we intend that custom test harnesses do
not need to support it for reasons outside of their own compatibility
requirements, much like the deprecation in #134283
I'm punting for now on the naming of `RUST_TEST_NOCAPTURE`.
I feel like T-testing-devex should do a wider look at environment
variables role in lib`test` before evaluating whether to
- Deprecate it in favor of the user passing CLI flags or the test runner
providing its own config
- Deprecate in favor of `RUST_TEST_NO_CAPTURE`
- Deprecate in favor of `RUST_TEST_CAPTURE`
Other CLI flags were evaluated for casing consistency:
- `--logfile` has the same problem but was deprecated in #134283
Regarding the implementation, I moved `--nocapture` out of `optgroups()`, into `parse_opts()`, out of an abundance of caution in passing the options without a deprecated value to the usage generation. However, the usage does not actually show optional flags, so this could potentially be dropped, simplifying the PR.
Note: `compiletest` added `--no-capture` instead of `--nocapture` in #134809
T-testing-devex FCP: https://github.com/rust-lang/rust/issues/133073#issuecomment-2486921104
Fixes #133073
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fix(docs): add newlines between prefix/suffix chapters
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toolchain version does not need to be specified
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Rollup of 8 pull requests
Successful merges:
- #137683 (Add a tidy check for GCC submodule version)
- #138968 (Update the index of Result to make the summary more comprehensive)
- #139572 (docs(std): mention const blocks in const keyword doc page)
- #140152 (Unify the format of rustc cli flags)
- #140193 (fix ICE in `#[naked]` attribute validation)
- #140205 (Tidying up UI tests [2/N])
- #140284 (remove expect() in `unnecessary_transmutes`)
- #140290 (rustdoc: fix typo change from equivelent to equivalent)
r? `@ghost`
`@rustbot` modify labels: rollup
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r=GuillaumeGomez
rustdoc: fix typo change from equivelent to equivalent
This PR fixes a typo in the search section in `rustdoc` book.
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Rollup of 8 pull requests
Successful merges:
- #137653 (Deprecate the unstable `concat_idents!`)
- #138957 (Update the index of Option to make the summary more comprehensive)
- #140006 (ensure compiler existance of tools on the dist step)
- #140143 (Move `sys::pal::os::Env` into `sys::env`)
- #140202 (Make #![feature(let_chains)] bootstrap conditional in compiler/)
- #140236 (norm nested aliases before evaluating the parent goal)
- #140257 (Some drive-by housecleaning in `rustc_borrowck`)
- #140278 (Don't use item name to look up associated item from trait item)
r? `@ghost`
`@rustbot` modify labels: rollup
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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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Stabilize flags for doctest cross compilation
This makes the following changes in preparation for supporting doctest cross-compiling in cargo:
- Renames `--runtool` and `--runtool-arg` to `--test-runtool` and `--test-runtool-arg` to maintain consistency with other `--test-*` arguments.
- Stabilizes the `--test-runtool` and `--test-runtool-arg`. These are needed in order to support cargo's `target.runner` option which specifies a runner to execute a cross-compiled doctest (for example, qemu).
- Stabilizes the `--enable-per-target-ignores` flag by removing it and making it unconditionally enabled. This makes it possible to disable a doctest on a per-target basis, which I think will be helpful for rolling out this feature.
These changes were suggested in https://rust-lang.zulipchat.com/#narrow/channel/266220-t-rustdoc/topic/stabilizing.20doctest.20xcompile/near/409281127
The intent is to stabilize the doctest-xcompile feature in cargo. This will help ensure that for projects that do cross-compile testing that their doctests are also covered. Currently there is a somewhat surprising behavior that they are ignored.
Closes https://github.com/rust-lang/rust/issues/64245
try-job: x86_64-msvc-1
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