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Dropped in favor a hard error in RUST-127907.
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directly
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This variant doesn't appear to have ever been used.
There's a matching message in `rustc_resolve`, that used to have a FIXME
for porting it to the new diagnostic infrastructure, but that message is
using `feature_err`, which doesn't use buffered lints. Thus, even when
that does get ported, it won't use `BuiltinLintDiag`.
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`rustc_lint_defs` uses `rustc_hir` solely for the `Namespace` type,
which it only needs the static description from. Use the static
description directly, to eliminate the dependency on `rustc_hir`.
This reduces a long dependency chain:
- Many things depend on `rustc_errors`
- `rustc_errors` depends on `rustc_lint_defs`
- `rustc_lint_defs` depended on `rustc_hir` prior to this commit
- `rustc_hir` depends on `rustc_target`
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Remove unused `#[must_use]`
Self-explanatory
Fixes https://github.com/rust-lang/rust/issues/145257
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don't link to the nightly version of the Edition Guide in stable lints
As reported in rust-lang/rust#143557 for `rust_2024_incompatible_pat`, most future-Edition-incompatibility lints link to the nightly version of the Edition Guide; the lints were written before their respective Editions (and their guides) stabilized. But now that Rusts 2021 and 2024 are stable, these lints are emitted on stable versions of the compiler, where it makes more sense to present users with links that don't say "nightly" in them.
This does not change the link for `rust_2024_incompatible_pat`. That's handled in rust-lang/rust#144006.
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r=traviscross,jieyouxu
Reword mismatched-lifetime-syntaxes text based on feedback
Key changes include:
- Removal of the word "syntax" from the lint message. More accurately, it could have been something like "syntax group" or "syntax category", but avoiding it completely is easier.
- The primary lint message now reflects exactly which mismatch is occurring, instead of trying to be general. A new `help` line is general across the mismatch kinds.
- Suggestions have been reduced to be more minimal, no longer also changing non-idiomatic but unrelated aspects.
- Suggestion text no longer mentions changes when those changes don't occur in that specific suggestion.
r? ``@jieyouxu``
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Linting public reexport of private dependencies
Part of public/private dependencies rust-lang/rust#44663
Partially addresses rust-lang/rust#71043
I'm adding a warning for reexports of private dependencies into `rustc_resolve`. I get that this should not be a warning, but should instead be a lint to be controlled by the feature gate, but I did not figure out how exactly to do that at that point. I tried doing the same thing as is done in `rustc_privacy`, but the linting system is not ready yet as far as I understand the error I got, so I made a warning for now instead. Some guidance on how to emit lints with `dcx` would be appreciated.
This also sets the `std_detect` crate as a public dependency of `std` because some macros are reexported from there. I did not check closer, but the other option may be to allow the specific reexports instead.
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Key changes include:
- Removal of the word "syntax" from the lint message. More accurately,
it could have been something like "syntax group" or "syntax
category", but avoiding it completely is easier.
- The primary lint message now reflects exactly which mismatch is
occurring, instead of trying to be general. A new `help` line is
general across the mismatch kinds.
- Suggestions have been reduced to be more minimal, no longer also
changing non-idiomatic but unrelated aspects.
- Suggestion text no longer mentions changes when those changes don't
occur in that specific suggestion.
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This commit adds a lint to prevent the use of rustc_type_ir in random
compiler crates, except for type system internals traits, which are
explicitly allowed. Moreover, this fixes diagnostic_items() to include
the CRATE_OWNER_ID, otherwise rustc_diagnostic_item attribute is ignored
on the crate root.
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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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Rollup of 9 pull requests
Successful merges:
- rust-lang/rust#128425 (Make `missing_fragment_specifier` an unconditional error)
- rust-lang/rust#135927 (retpoline and retpoline-external-thunk flags (target modifiers) to enable retpoline-related target features)
- rust-lang/rust#140770 (add `extern "custom"` functions)
- rust-lang/rust#142176 (tests: Split dont-shuffle-bswaps along opt-levels and arches)
- rust-lang/rust#142248 (Add supported asm types for LoongArch32)
- rust-lang/rust#142267 (assert more in release in `rustc_ast_lowering`)
- rust-lang/rust#142274 (Update the stdarch submodule)
- rust-lang/rust#142276 (Update dependencies in `library/Cargo.lock`)
- rust-lang/rust#142308 (Upgrade `object`, `addr2line`, and `unwinding` in the standard library)
Failed merges:
- rust-lang/rust#140920 (Extract some shared code from codegen backend target feature handling)
r? `@ghost`
`@rustbot` modify labels: rollup
try-job: aarch64-apple
try-job: x86_64-msvc-1
try-job: x86_64-gnu
try-job: dist-i586-gnu-i586-i686-musl
try-job: test-various
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refactor `AttributeGate` and `rustc_attr!` to emit notes during feature checking
First commit changes the following:
- `AttributeGate ` from an enum with (four) tuple fields to (five) named fields
- adds a `notes` fields that is emitted as notes in the `PostExpansionVisitor` pass
- removes the `this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date` note if the feature gate is `rustc_attrs`.
- various phrasing changes and touchups
- and finally, the reason why I went down this path to begin with: tell people they can use the diagnostic namespace when they hit the rustc_on_unimplemented feature gate 🙈
Second commit removes unused machinery for deprecated attributes
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This was attempted in [1] then reverted in [2] because of fallout.
Recently, this was made an edition-dependent error in [3].
Make missing fragment specifiers an unconditional error again.
[1]: https://github.com/rust-lang/rust/pull/75516
[2]: https://github.com/rust-lang/rust/pull/80210
[3]: https://github.com/rust-lang/rust/pull/128006
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checking
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r=traviscross,jieyouxu
Add a new `mismatched-lifetime-syntaxes` lint
The lang-team [discussed this](https://hackmd.io/nf4ZUYd7Rp6rq-1svJZSaQ) and I attempted to [summarize](https://github.com/rust-lang/rust/pull/120808#issuecomment-2701863833) their decision. The summary-of-the-summary is:
- Using two different kinds of syntax for elided lifetimes is confusing. In rare cases, it may even [lead to unsound code](https://github.com/rust-lang/rust/issues/48686)! Some examples:
```rust
// Lint will warn about these
fn(v: ContainsLifetime) -> ContainsLifetime<'_>;
fn(&'static u8) -> &u8;
```
- Matching up references with no lifetime syntax, references with anonymous lifetime syntax, and paths with anonymous lifetime syntax is an exception to the simplest possible rule:
```rust
// Lint will not warn about these
fn(&u8) -> &'_ u8;
fn(&'_ u8) -> &u8;
fn(&u8) -> ContainsLifetime<'_>;
```
- Having a lint for consistent syntax of elided lifetimes will make the [future goal](https://github.com/rust-lang/rust/issues/91639) of warning-by-default for paths participating in elision much simpler.
---
This new lint attempts to accomplish the goal of enforcing consistent syntax. In the process, it supersedes and replaces the existing `elided-named-lifetimes` lint, which means it starts out life as warn-by-default.
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r=traviscross,workingjubilee
Remove `i128` and `u128` from `improper_ctypes_definitions`
Rust's 128-bit integers have historically been incompatible with C [1]. However, there have been a number of changes in Rust and LLVM that mean this is no longer the case:
* Incorrect alignment of `i128` on x86 [1]: adjusting Rust's alignment proposed at https://github.com/rust-lang/compiler-team/issues/683, implemented at https://github.com/rust-lang/rust/pull/116672.
* LLVM version of the above: resolved in LLVM, including ABI fix. Present in LLVM18 (our minimum supported version).
* Incorrect alignment of `i128` on 64-bit PowerPC, SPARC, and MIPS [2]: Rust's data layouts adjusted at https://github.com/rust-lang/rust/pull/132422, https://github.com/rust-lang/rust/pull/132741, https://github.com/rust-lang/rust/pull/134115.
* LLVM version of the above: done in LLVM 20 https://github.com/llvm/llvm-project/issues/102783.
* Incorrect return convention of `i128` on Windows: adjusted to match GCC and Clang at https://github.com/rust-lang/rust/pull/134290.
At https://github.com/rust-lang/lang-team/issues/255#issuecomment-2088855084, the lang team considered it acceptable to remove `i128` from `improper_ctypes_definitions` if the LLVM version is known to be compatible. Time has elapsed since then and we have dropped support for LLVM versions that do not have the x86 fixes, meaning a per-llvm-version lint should no longer be necessary. The PowerPC, SPARC, and MIPS changes only came in LLVM 20 but since Rust's datalayouts have also been updated to match, we will be using the correct alignment regardless of LLVM version.
`repr(i128)` was added to this lint in https://github.com/rust-lang/rust/pull/138282, but is also removed here.
Part of the decision is that `i128` should match `__int128` in C on platforms that provide it, which documentation is updated to indicate. We will not guarantee that `i128` matches `_BitInt(128)` since that can be different from `__int128`. Some platforms (usually 32-bit) do not provide `__int128`; if any ABIs are extended in the future to define it, we will need to make sure that our ABI matches.
Closes: https://github.com/rust-lang/rust/issues/134288
[1]: https://github.com/rust-lang/rust/issues/54341
[2]: https://github.com/rust-lang/rust/issues/128950
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Use `cfg_attr_trace` in AST with a placeholder attribute for accurate suggestion
In rust-lang/rust#138515, we insert a placeholder attribute so that checks for attributes can still know about the placement of `cfg` attributes. When we suggest removing items with `cfg_attr`s (fix rust-lang/rust#56328) and make them verbose. We tweak the wording of the existing "unused `extern crate`" lint.
```
warning: unused `extern crate`
--> $DIR/removing-extern-crate.rs:9:1
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LL | extern crate removing_extern_crate as foo;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused
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note: the lint level is defined here
--> $DIR/removing-extern-crate.rs:6:9
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LL | #![warn(rust_2018_idioms)]
| ^^^^^^^^^^^^^^^^
= note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`
help: remove the unused `extern crate`
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LL - #[cfg_attr(test, macro_use)]
LL - extern crate removing_extern_crate as foo;
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```
r? `@petrochenkov`
try-job: x86_64-gnu-aux
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Rust's 128-bit integers have historically been incompatible with C [1].
However, there have been a number of changes in Rust and LLVM that
mean this is no longer the case:
* Incorrect alignment of `i128` on x86 [1]: adjusting Rust's alignment
proposed at https://github.com/rust-lang/compiler-team/issues/683,
implemented at https://github.com/rust-lang/rust/pull/116672.
* LLVM version of the above: resolved in LLVM, including ABI fix.
Present in LLVM18 (our minimum supported version).
* Incorrect alignment of `i128` on 64-bit PowerPC, SPARC, and MIPS [2]:
Rust's data layouts adjusted at
https://github.com/rust-lang/rust/pull/132422,
https://github.com/rust-lang/rust/pull/132741,
https://github.com/rust-lang/rust/pull/134115.
* LLVM version of the above: done in LLVM 20
https://github.com/llvm/llvm-project/issues/102783.
* Incorrect return convention of `i128` on Windows: adjusted to match
GCC and Clang at https://github.com/rust-lang/rust/pull/134290.
At [3], the lang team considered it acceptable to remove `i128` from
`improper_ctypes_definitions` if the LLVM version is known to be
compatible. Time has elapsed since then and we have dropped support for
LLVM versions that do not have the x86 fixes, meaning a per-llvm-version
lint should no longer be necessary. The PowerPC, SPARC, and MIPS changes
only came in LLVM 20 but since Rust's datalayouts have also been updated
to match, we will be using the correct alignment regardless of LLVM
version.
`repr(i128)` was added to this lint in [4], but is also removed here.
Part of the decision is that `i128` should match `__int128` in C on
platforms that provide it, which documentation is updated to indicate.
We will not guarantee that `i128` matches `_BitInt(128)` since that can
be different from `__int128`. Some platforms (usually 32-bit) do not
provide `__int128`; if any ABIs are extended in the future to define it,
we will need to make sure that our ABI matches.
Closes: https://github.com/rust-lang/rust/issues/134288
Closes: https://github.com/rust-lang/rust/issues/128950
[1]: https://github.com/rust-lang/rust/issues/54341
[2]: https://github.com/rust-lang/rust/issues/128950
[3]: https://github.com/rust-lang/lang-team/issues/255#issuecomment-2088855084
[4]: https://github.com/rust-lang/rust/pull/138282
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PR 138515, we insert a placeholder attribute so that checks for attributes can still know about the placement of `cfg` attributes. When we suggest removing items with `cfg_attr`s (fix Issue 56328) and make them verbose. We tweak the wording of the existing "unused `extern crate`" lint.
```
warning: unused extern crate
--> $DIR/removing-extern-crate.rs:9:1
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LL | extern crate removing_extern_crate as foo;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused
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note: the lint level is defined here
--> $DIR/removing-extern-crate.rs:6:9
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LL | #![warn(rust_2018_idioms)]
| ^^^^^^^^^^^^^^^^
= note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`
help: remove the unused `extern crate`
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LL - #[cfg_attr(test, macro_use)]
LL - extern crate removing_extern_crate as foo;
LL +
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```
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Make two transmute-related MIR lints into HIR lint
Make `PTR_TO_INTEGER_TRANSMUTE_IN_CONSTS` (rust-lang/rust#130540) and `UNNECESSARY_TRANSMUTES` (rust-lang/rust#136083) into "normal" HIR-based lints.
Funny enough this came up in the review of the latter (https://github.com/rust-lang/rust/pull/136083#issuecomment-2614301413), but I guess it just was overlooked.
But anywyas, there's no reason for these to be MIR lints; in fact, it makes the suggestions for them a bit more complicated than necessary.
Note that there's probably a few more simplifications and improvements to be done here. Follow-ups can be done in a separate PR, especially if they're about the messaging and suggestions themselves, which I didn't write.
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Improve `ambiguous_wide_pointer_comparisons` lint compare diagnostics
This PR improves the `ambiguous_wide_pointer_comparisons` lint compare diagnostics: `cmp`/`partial_cmp`, but also the operators `<`/`>`/`>=`/`<=`, by:
1. removing the reference to `std::ptr::addr_eq` which only works for equality
2. and adding an `#[expect]` suggestion for keeping the current behavior
Fixes rust-lang/rust#141510
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Rollup of 7 pull requests
Successful merges:
- #140056 (Fix a wrong error message in 2024 edition)
- #140220 (Fix detection of main function if there are expressions around it)
- #140249 (Remove `weak` alias terminology)
- #140316 (Introduce `BoxMarker` to improve pretty-printing correctness)
- #140347 (ci: clean more disk space in codebuild)
- #140349 (ci: use aws codebuild for the `dist-x86_64-linux` job)
- #140379 (rustc-dev-guide subtree update)
r? `@ghost`
`@rustbot` modify labels: rollup
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Uplift `clippy::invalid_null_ptr_usage` lint as `invalid_null_arguments`
This PR aims at uplifting the `clippy::invalid_null_ptr_usage` lint into rustc, this is similar to the [`clippy::invalid_utf8_in_unchecked` uplift](https://github.com/rust-lang/rust/pull/111543) a few months ago, in the sense that those two lints lint on invalid parameter(s), here a null pointer where it is unexpected and UB to pass one.
*For context: GitHub Search reveals that just for `slice::from_raw_parts{_mut}` [~20 invalid usages](hhttps://github.com/search?q=lang%3Arust+%2Fslice%3A%3Afrom_raw_parts%28_mut%29%3F%5C%28ptr%3A%3Anull%2F+NOT+path%3A%2F%5Eclippy_lints%5C%2Fsrc%5C%2F%2F+NOT+path%3A%2F%5Erust%5C%2Fsrc%5C%2Ftools%5C%2Fclippy%5C%2Fclippy_lints%5C%2Fsrc%5C%2F%2F+NOT+path%3A%2F%5Esrc%5C%2Ftools%5C%2Fclippy%5C%2Fclippy_lints%5C%2Fsrc%5C%2F%2F&type=code) with `ptr::null` and an additional [4 invalid usages](https://github.com/search?q=lang%3Arust+%2Fslice%3A%3Afrom_raw_parts%5C%280%28%5C%29%7C+as%29%2F+NOT+path%3A%2F%5Eclippy_lints%5C%2Fsrc%5C%2F%2F+NOT+path%3A%2F%5Erust%5C%2Fsrc%5C%2Ftools%5C%2Fclippy%5C%2Fclippy_lints%5C%2Fsrc%5C%2F%2F+NOT+path%3A%2F%5Esrc%5C%2Ftools%5C%2Fclippy%5C%2Fclippy_lints%5C%2Fsrc%5C%2F%2F+NOT+path%3A%2F%5Eutils%5C%2Ftinystr%5C%2Fsrc%5C%2F%2F+NOT+path%3A%2F%5Eutils%5C%2Fzerovec%5C%2Fsrc%5C%2F%2F+NOT+path%3A%2F%5Eprovider%5C%2Fcore%5C%2Fsrc%5C%2F%2F&type=code) with `0 as *const ...`-ish casts.*
-----
## `invalid_null_arguments`
(deny-by-default)
The `invalid_null_arguments` lint checks for invalid usage of null pointers.
### Example
```rust
// Undefined behavior
unsafe { std::slice::from_raw_parts(ptr::null(), 1); }
```
Produces:
```
error: calling this function with a null pointer is Undefined Behavior, even if the result of the function is unused
--> $DIR/invalid_null_args.rs:21:23
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LL | let _: &[usize] = std::slice::from_raw_parts(ptr::null_mut(), 0);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^---------------^^^^
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| null pointer originates from here
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= help: for more information, visit <https://doc.rust-lang.org/std/ptr/index.html> and <https://doc.rust-lang.org/reference/behavior-considered-undefined.html>
```
### Explanation
Calling methods whose safety invariants requires non-null pointer with a null pointer is undefined behavior.
-----
The lint use a list of functions to know which functions and arguments to checks, this could be improved in the future with a rustc attribute, or maybe even with a `#[diagnostic]` attribute.
This PR also includes some small refactoring to avoid some ambiguities in naming, those can be done in another PR is desired.
`@rustbot` label: +I-lang-nominated
r? compiler
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