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r=compiler-errors
Add internal lint for detecting non-glob imports of `rustc_type_ir::inherent`
https://github.com/rust-lang/rust/pull/127627#issuecomment-2225295951
r? compiler-errors
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Use Option's discriminant as its size hint
I was looking at this in MIR after a question on discord, and noticed that it ends up with a switch in MIR (<https://rust.godbolt.org/z/3q4cYnnb3>), which it doesn't need because (as `Option::as_slice` uses) the discriminant is already the length.
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r=petrochenkov
make pub_use_of_private_extern_crate show up in cargo's future breakage reports
This has been a lint for many years.
However, turns out that outright removing it right now would lead to [tons of crater regressions](https://github.com/rust-lang/rust/pull/127656#issuecomment-2233288534) due to crates depending on an ancient version of `bitflags`. So for now this PR just makes this future-compat lint show up in cargo's reports, so people are warned when they use a dependency that is affected by this.
r? `@petrochenkov`
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Fix ambiguous cases of multiple & in elided self lifetimes
This change proposes simpler rules to identify the lifetime on `self` parameters which may be used to elide a return type lifetime.
## The old rules
(copied from [this comment](https://github.com/rust-lang/rust/pull/117967#discussion_r1420554242))
Most of the code can be found in [late.rs](https://doc.rust-lang.org/stable/nightly-rustc/src/rustc_resolve/late.rs.html) and acts on AST types. The function [resolve_fn_params](https://doc.rust-lang.org/stable/nightly-rustc/src/rustc_resolve/late.rs.html#2006), in the success case, returns a single lifetime which can be used to elide the lifetime of return types.
Here's how:
* If the first parameter is called self then we search that parameter using "`self` search rules", below
* If no unique applicable lifetime was found, search all other parameters using "regular parameter search rules", below
(In practice the code does extra work to assemble good diagnostic information, so it's not quite laid out like the above.)
### `self` search rules
This is primarily handled in [find_lifetime_for_self](https://doc.rust-lang.org/stable/nightly-rustc/src/rustc_resolve/late.rs.html#2118) , and is described slightly [here](https://github.com/rust-lang/rust/issues/117715#issuecomment-1813115477) already. The code:
1. Recursively walks the type of the `self` parameter (there's some complexity about resolving various special cases, but it's essentially just walking the type as far as I can see)
2. Each time we find a reference anywhere in the type, if the **direct** referent is `Self` (either spelled `Self` or by some alias resolution which I don't fully understand), then we'll add that to a set of candidate lifetimes
3. If there's exactly one such unique lifetime candidate found, we return this lifetime.
### Regular parameter search rules
1. Find all the lifetimes in each parameter, including implicit, explicit etc.
2. If there's exactly one parameter containing lifetimes, and if that parameter contains exactly one (unique) lifetime, *and if we didn't find a `self` lifetime parameter already*, we'll return this lifetime.
## The new rules
There are no changes to the "regular parameter search rules" or to the overall flow, only to the `self` search rules which are now:
1. Recursively walks the type of the `self` parameter, searching for lifetimes of reference types whose referent **contains** `Self`.[^1]
2. Keep a record of:
* Whether 0, 1 or n unique lifetimes are found on references encountered during the walk
4. If no lifetime was found, we don't return a lifetime. (This means other parameters' lifetimes may be used for return type lifetime elision).
5. If there's one lifetime found, we return the lifetime.
6. If multiple lifetimes were found, we abort elision entirely (other parameters' lifetimes won't be used).
[^1]: this prevents us from considering lifetimes from inside of the self-type
## Examples that were accepted before and will now be rejected
```rust
fn a(self: &Box<&Self>) -> &u32
fn b(self: &Pin<&mut Self>) -> &String
fn c(self: &mut &Self) -> Option<&Self>
fn d(self: &mut &Box<Self>, arg: &usize) -> &usize // previously used the lt from arg
```
### Examples that change the elided lifetime
```rust
fn e(self: &mut Box<Self>, arg: &usize) -> &usize
// ^ new ^ previous
```
## Examples that were rejected before and will now be accepted
```rust
fn f(self: &Box<Self>) -> &u32
```
---
*edit: old PR description:*
```rust
struct Concrete(u32);
impl Concrete {
fn m(self: &Box<Self>) -> &u32 {
&self.0
}
}
```
resulted in a confusing error.
```rust
impl Concrete {
fn n(self: &Box<&Self>) -> &u32 {
&self.0
}
}
```
resulted in no error or warning, despite apparent ambiguity over the elided lifetime.
Fixes https://github.com/rust-lang/rust/issues/117715
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Migrate `issue-85401-static-mir`, `missing-crate-dependency` and `unstable-flag-required` `run-make` tests to rmake
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
try-job: armhf-gnu
try-job: test-various
try-job: x86_64-msvc
try-job: aarch64-apple
try-job: dist-x86_64-linux
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Const-to-pattern-to-MIR cleanup
Now that all uses of constants without structural equality are hard errors, there's a bunch of cleanup we can do in the code that handles patterns: we can always funnel patterns through valtrees first (rather than having a fallback path for when valtree construction fails), and we can make sure that if we emit a `PartialEq` call it is not calling anything user-defined.
To keep the error messages the same, I made valtree construction failures return the information of *which* type it is that cannot be valtree'd. `search_for_structural_match_violation` is now not needed any more at all, so I removed it.
r? `@oli-obk`
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Migrate 8 very similar FFI `run-make` tests to rmake
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
There are some more of these, but while the code is almost always the same, I want to keep the number reasonable so my doc comments can be inspected for potential inaccuracies. Tell me if 8 is too much, I can cut this down.
For the tracking issue:
- issue-25581
- extern-fn-with-extern-types
- extern-fn-struct-passing-abi
- longjmp-across-rust
- static-extern-type
- extern-fn-explicit-align
- extern-fn-with-packed-struct
- extern-fn-mangle
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constants
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More accurate span for anonymous argument suggestion
Use smaller span for suggesting adding `_:` ahead of a type:
```
error: expected one of `(`, `...`, `..=`, `..`, `::`, `:`, `{`, or `|`, found `)`
--> $DIR/anon-params-denied-2018.rs:12:47
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LL | fn foo_with_qualified_path(<Bar as T>::Baz);
| ^ expected one of 8 possible tokens
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= note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: explicitly ignore the parameter name
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LL | fn foo_with_qualified_path(_: <Bar as T>::Baz);
| ++
```
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More accurate span for type parameter suggestion
After:
```
error[E0229]: associated item constraints are not allowed here
--> $DIR/impl-block-params-declared-in-wrong-spot-issue-113073.rs:3:10
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LL | impl Foo<T: Default> for String {}
| ^^^^^^^^^^ associated item constraint not allowed here
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help: declare the type parameter right after the `impl` keyword
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LL - impl Foo<T: Default> for String {}
LL + impl<T: Default> Foo<T> for String {}
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```
Before:
```
error[E0229]: associated item constraints are not allowed here
--> $DIR/impl-block-params-declared-in-wrong-spot-issue-113073.rs:3:10
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LL | impl Foo<T: Default> for String {}
| ^^^^^^^^^^ associated item constraint not allowed here
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help: declare the type parameter right after the `impl` keyword
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LL | impl<T: Default> Foo<T> for String {}
| ++++++++++++ ~
```
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Accurate `use` rename suggestion span
When suggesting to rename an import with `as`, use a smaller span to render the suggestion with a better format:
```
error[E0252]: the name `baz` is defined multiple times
--> $DIR/issue-25396.rs:4:5
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LL | use foo::baz;
| -------- previous import of the module `baz` here
LL | use bar::baz;
| ^^^^^^^^ `baz` reimported here
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= note: `baz` must be defined only once in the type namespace of this module
help: you can use `as` to change the binding name of the import
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LL | use bar::baz as other_baz;
| ++++++++++++
```
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Fix associated item removal suggestion
We were previously telling people to write what was already there, instead of removal (treating it as a `help`). We now properly suggest to remove the code that needs to be removed.
```
error[E0229]: associated item constraints are not allowed here
--> $DIR/E0229.rs:13:25
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LL | fn baz<I>(x: &<I as Foo<A = Bar>>::A) {}
| ^^^^^^^ associated item constraint not allowed here
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help: consider removing this associated item binding
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LL - fn baz<I>(x: &<I as Foo<A = Bar>>::A) {}
LL + fn baz<I>(x: &<I as Foo>::A) {}
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```
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Migrate `atomic-lock-free` to `rmake`
Also adds `llvm_components_contain` to `run-make-support`.
Part of #121876.
r? ``@jieyouxu``
try-job: dist-x86_64-linux
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Put the dots back in RTN pretty printing
Also don't render RTN-like bounds for methods with ty/const params.
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compiler-errors:precise-capturing-better-sugg-apit, r=oli-obk
Fix precise capturing suggestion for hidden regions when we have APITs
Suggests to turn APITs into type parameters so they can be named in precise capturing syntax for hidden type lifetime errors. We also note that it may change the API.
This is currently done via a note *and* a suggestion, which feels a bit redundant, but I wasn't totally sure of a better alternative for the presentation.
Code is kind of a mess but there's a lot of cases to consider. Happy to iterate on this if you think the approach is too messy.
Based on #127619, only the last commit is relevant.
r? oli-obk
Tracking:
- https://github.com/rust-lang/rust/issues/123432
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[`macro_metavar_expr_concat`] Add support for literals
Adds support for literals in macro parameters.
```rust
macro_rules! with_literal {
($literal:literal) => {
const ${concat(FOO, $literal)}: i32 = 1;
}
}
fn main() {
with_literal!("_BAR");
assert_eq!(FOO_BAR, 1);
}
```
cc #124225
r? ``@petrochenkov``
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Use smaller span for suggesting adding `_:` ahead of a type:
```
error: expected one of `(`, `...`, `..=`, `..`, `::`, `:`, `{`, or `|`, found `)`
--> $DIR/anon-params-denied-2018.rs:12:47
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LL | fn foo_with_qualified_path(<Bar as T>::Baz);
| ^ expected one of 8 possible tokens
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= note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: explicitly ignore the parameter name
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LL | fn foo_with_qualified_path(_: <Bar as T>::Baz);
| ++
```
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After:
```
error[E0229]: associated item constraints are not allowed here
--> $DIR/impl-block-params-declared-in-wrong-spot-issue-113073.rs:3:10
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LL | impl Foo<T: Default> for String {}
| ^^^^^^^^^^ associated item constraint not allowed here
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help: declare the type parameter right after the `impl` keyword
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LL - impl Foo<T: Default> for String {}
LL + impl<T: Default> Foo<T> for String {}
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```
Before:
```
error[E0229]: associated item constraints are not allowed here
--> $DIR/impl-block-params-declared-in-wrong-spot-issue-113073.rs:3:10
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LL | impl Foo<T: Default> for String {}
| ^^^^^^^^^^ associated item constraint not allowed here
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help: declare the type parameter right after the `impl` keyword
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LL | impl<T: Default> Foo<T> for String {}
| ++++++++++++ ~
```
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When suggesting to rename an import with `as`, use a smaller span to
render the suggestion with a better format:
```
error[E0252]: the name `baz` is defined multiple times
--> $DIR/issue-25396.rs:4:5
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LL | use foo::baz;
| -------- previous import of the module `baz` here
LL | use bar::baz;
| ^^^^^^^^ `baz` reimported here
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= note: `baz` must be defined only once in the type namespace of this module
help: you can use `as` to change the binding name of the import
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LL | use bar::baz as other_baz;
| ++++++++++++
```
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Rollup of 8 pull requests
Successful merges:
- #125042 (Use ordinal number in argument error)
- #127229 (rustdoc: click target for sidebar items flush left)
- #127337 (Move a few intrinsics to Rust abi)
- #127472 (MIR building: Stop using `unpack!` for `BlockAnd<()>`)
- #127579 (Solve a error `.clone()` suggestion when moving a mutable reference)
- #127769 (Don't use implicit features in `Cargo.toml` in `compiler/`)
- #127844 (Remove invalid further restricting suggestion for type bound)
- #127855 (Add myself to review rotation)
r? `@ghost`
`@rustbot` modify labels: rollup
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We were previously telling people to write what was already there, instead of removal.
```
error[E0229]: associated item constraints are not allowed here
--> $DIR/E0229.rs:13:25
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LL | fn baz<I>(x: &<I as Foo<A = Bar>>::A) {}
| ^^^^^^^ associated item constraint not allowed here
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help: consider removing this associated item binding
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LL - fn baz<I>(x: &<I as Foo<A = Bar>>::A) {}
LL + fn baz<I>(x: &<I as Foo>::A) {}
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```
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Remove invalid further restricting suggestion for type bound
This PR partially addresses #127555, it will remove the obvious error suggestion:
```console
| ^^^^ required by this bound in `<Baz as Foo>::bar`
help: consider further restricting this bound
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12 | F: FnMut() + Send + std::marker::Send,
| +++++++++++++++++++
```
I may create another PR to get a better diagnostic for `impl has stricter requirements than trait` scenario.
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Solve a error `.clone()` suggestion when moving a mutable reference
If the moved value is a mut reference, it is used in a generic function and it's type is a generic param, suggest it can be reborrowed to avoid moving.
for example:
```rust
struct Y(u32);
// x's type is '& mut Y' and it is used in `fn generic<T>(x: T) {}`.
fn generic<T>(x: T) {}
```
fixes #127285
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Move a few intrinsics to Rust abi
Move a few more intrinsic functions to the convention added in #121192. In the second commit, I added documentation about their safety requirements. Let me know if you would like me to move the second commit to a different PR.
Note: I kept the same signature of `pref_align_of`, but I was wondering why this function is considered unsafe?
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rustdoc: click target for sidebar items flush left
This change adjusts the clickable area of sidebar links to touch the leftmost edge of the canvas, making them [much easier](https://www.nngroup.com/articles/fitts-law/) to click (when the browser window is maximized or tiled left, but those cases are common enough to matter).
[Screencast from 2024-07-15 15-31-07.webm](https://github.com/user-attachments/assets/1e952d3a-e9e7-476b-b211-44a17c190b38)
<details><summary>old screencast</summary>
[Screencast from 2024-07-01 17-23-34.webm](https://github.com/rust-lang/rust/assets/1593513/dc6f9c2e-5904-403d-b353-d233e6e1afbc)
</details>
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Use ordinal number in argument error
Add an ordinal number to two argument errors ("unexpected" and "missing") for ease of understanding error.
```
error[E0061]: this function takes 3 arguments but 2 arguments were supplied
--> test.rs:11:5
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11 | f(42, 'a');
| ^ --- 2nd argument of type `f32` is missing
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(snip)
error[E0061]: this function takes 3 arguments but 4 arguments were supplied
--> test.rs:12:5
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12 | f(42, 42, 1.0, 'a');
| ^ ----
| | |
| | unexpected 2nd argument of type `{integer}`
| help: remove the extra argument
```
To get an ordinal number, I copied `ordinalize` from other crate `rustc_resolve` because I think it is too much to link `rustc_resolve` for this small function. Please let me know if there is a better way.
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