Currently we skip deriving `PartialEq::ne` for C-like (fieldless) enums
and empty structs, thus reyling on the default `ne`. This behaviour is
unnecessarily conservative, because the `PartialEq` docs say this:
> Implementations must ensure that eq and ne are consistent with each other:
>
> `a != b` if and only if `!(a == b)` (ensured by the default
> implementation).
This means that the default implementation (`!(a == b)`) is always good
enough. So this commit changes things such that `ne` is never derived.
The motivation for this change is that not deriving `ne` reduces compile
times and binary sizes.
Observable behaviour may change if a user has defined a type `A` with an
inconsistent `PartialEq` and then defines a type `B` that contains an
`A` and also derives `PartialEq`. Such code is already buggy and
preserving bug-for-bug compatibility isn't necessary.
Two side-effects of the change:
- There is only one error message produced for types where `PartialEq`
cannot be derived, instead of two.
- For coverage reports, some warnings about generated `ne` methods not
being executed have disappeared.
Both side-effects seem fine, and possibly preferable.
Rollup of 5 pull requests
Successful merges:
- #99311 (change maybe_body_owned_by to take local def id)
- #99862 (Improve type mismatch w/ function signatures)
- #99895 (don't call type ascription "cast")
- #99900 (remove some manual hash stable impls)
- #99903 (Add diagnostic when using public instead of pub)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Add diagnostic when using public instead of pub
Forwarding from https://github.com/rust-lang/rust/pull/99706
I accidentally broke something(??) in git and the commits in that PR are absolutely not what I did in that branch
Anyways, this is the PR for this now. Adding tests again in a minute.
cc `@davidtwco`
Improve type mismatch w/ function signatures
This PR makes use of `note: expected/found` (instead of labeling types in labels) in type mismatch with function signatures. Pros: it's easier to compare the signatures, cons: the error is a little more verbose now.
This is especially nice when
- The signatures differ in a small subset of parameters (same parameters are elided)
- The difference is in details, for example `isize` vs `usize` (there is a better chance that the types align)
Also this PR fixes the inconsistency in variable names in the edited code (`expected` and `found`).
A zulip thread from which this pr started: [[link]](https://rust-lang.zulipchat.com/#narrow/stream/147480-t-compiler.2Fwg-diagnostics/topic/Type.20error.20regression.3F.2E.2E.2E/near/289756602).
An example diagnostic:
<table>
<tr>
<th>this pr</th>
<th>nightly</th>
</tr>
<tr>
<td>
```text
error[E0631]: type mismatch in function arguments
--> ./t.rs:4:12
|
4 | expect(&f);
| ------ ^^ expected due to this
| |
| required by a bound introduced by this call
...
10 | fn f(_: isize, _: u8, _: Vec<u32>) {}
| ---------------------------------- found signature defined here
|
= note: expected function signature `fn(usize, _, Vec<u64>) -> _`
found function signature `fn(isize, _, Vec<u32>) -> _`
note: required because of the requirements on the impl of `Trait` for `fn(isize, u8, Vec<u32>) {f}`
--> ./t.rs:8:9
|
8 | impl<F> Trait for F where F: Fn(usize, u8, Vec<u64>) -> u8 {}
| ^^^^^ ^
= note: required for the cast from `fn(isize, u8, Vec<u32>) {f}` to the object type `dyn Trait`
```
</td>
<td>
```text
error[E0631]: type mismatch in function arguments
--> ./t.rs:4:12
|
4 | expect(&f);
| ------ ^^ expected signature of `fn(usize, u8, Vec<u64>) -> _`
| |
| required by a bound introduced by this call
...
10 | fn f(_: isize, _: u8, _: Vec<u32>) {}
| ---------------------------------- found signature of `fn(isize, u8, Vec<u32>) -> _`
|
note: required because of the requirements on the impl of `Trait` for `fn(isize, u8, Vec<u32>) {f}`
--> ./t.rs:8:9
|
8 | impl<F> Trait for F where F: Fn(usize, u8, Vec<u64>) -> u8 {}
| ^^^^^ ^
= note: required for the cast to the object type `dyn Trait`
```
</td>
</tr>
</table>
<details><summary>code</summary>
<p>
```rust
fn main() {
fn expect(_: &dyn Trait) {}
expect(&f);
}
trait Trait {}
impl<F> Trait for F where F: Fn(usize, u8, Vec<u64>) -> u8 {}
fn f(_: isize, _: u8, _: Vec<u32>) {}
```
</p>
</details>
r? `@compiler-errors`
Remove `TreeAndSpacing`.
A `TokenStream` contains a `Lrc<Vec<(TokenTree, Spacing)>>`. But this is
not quite right. `Spacing` makes sense for `TokenTree::Token`, but does
not make sense for `TokenTree::Delimited`, because a
`TokenTree::Delimited` cannot be joined with another `TokenTree`.
This commit fixes this problem, by adding `Spacing` to `TokenTree::Token`,
changing `TokenStream` to contain a `Lrc<Vec<TokenTree>>`, and removing the
`TreeAndSpacing` typedef.
The commit removes these two impls:
- `impl From<TokenTree> for TokenStream`
- `impl From<TokenTree> for TreeAndSpacing`
These were useful, but also resulted in code with many `.into()` calls
that was hard to read, particularly for anyone not highly familiar with
the relevant types. This commit makes some other changes to compensate:
- `TokenTree::token()` becomes `TokenTree::token_{alone,joint}()`.
- `TokenStream::token_{alone,joint}()` are added.
- `TokenStream::delimited` is added.
This results in things like this:
```rust
TokenTree::token(token::Semi, stmt.span).into()
```
changing to this:
```rust
TokenStream::token_alone(token::Semi, stmt.span)
```
This makes the type of the result, and its spacing, clearer.
These changes also simplifies `Cursor` and `CursorRef`, because they no longer
need to distinguish between `next` and `next_with_spacing`.
r? `@petrochenkov`
use `check_region_obligations_and_report_errors` to avoid ICEs
If we don't call `process_registered_region_obligations` before `resolve_regions_and_report_errors` then we'll ICE if we have any region obligations, and `check_region_obligations_and_report_errors` just does both of these for us in a nice convenient function.
Fixes#53475
r? types
proc_macro: use crossbeam channels for the proc_macro cross-thread bridge
This is done by having the crossbeam dependency inserted into the `proc_macro` server code from the server side, to avoid adding a dependency to `proc_macro`.
In addition, this introduces a -Z command-line option which will switch rustc to run proc-macros using this cross-thread executor. With the changes to the bridge in #98186, #98187, #98188 and #98189, the performance of the executor should be much closer to same-thread execution.
In local testing, the crossbeam executor was substantially more performant than either of the two existing `CrossThread` strategies, so they have been removed to keep things simple.
r? `@eddyb`
Rollup of 8 pull requests
Successful merges:
- #99227 (Fix thumbv4t-none-eabi frame pointer setting)
- #99518 (Let-else: break out scopes when a let-else pattern fails to match)
- #99671 (Suggest dereferencing index when trying to use a reference of usize as index)
- #99831 (Add Fuchsia platform support documentation)
- #99881 (fix ICE when computing codegen_fn_attrs on closure with non-fn parent)
- #99888 (Streamline lint checking)
- #99891 (Adjust an expr span to account for macros)
- #99904 (Cleanup html whitespace)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Cleanup html whitespace
I realized while looking at the raw HTML that we generated some unwanted white space characters. This PR cleans up the one coming directly from rustdoc. I'll check from `pulldown-cmark` for the remaining ones.
Some numbers now: the difference is small, it goes from `63009` to `62859`. But multiplied by the number of files, it becomes quite interesting overall.
r? `@notriddle`
Adjust an expr span to account for macros
Fix this erroneous suggestion:
```
error[E0529]: expected an array or slice, found `Vec<{integer}>`
--> /home/gh-compiler-errors/test.rs:2:9
|
2 | let [..] = vec![1, 2, 3];
| ^^^^ pattern cannot match with input type `Vec<{integer}>`
|
help: consider slicing here
--> /home/gh-compiler-errors/rust2/library/alloc/src/macros.rs:50:36
|
50~ $crate::__rust_force_expr!(<[_]>::into_vec(
51+ #[rustc_box]
52+ $crate::boxed::Box::new([$($x),+])
53~ )[..])
```
Streamline lint checking
The early (AST) and late (HIR) lint checkers have a number of functions that aren't used by rustc or clippy. Might as well remove them -- it's not like there's a canonical API here, as shown by the ad hoc use of `check_foo`/`check_foo_post` combinations.
r? `@cjgillot`
fix ICE when computing codegen_fn_attrs on closure with non-fn parent
Other call sites check `has_codegen_attrs` first, so let's do that too.
Fixes#99876
Add Fuchsia platform support documentation
This documentation contains instructions for building and running binaries on Fuchsia using its provided SDK.
Let-else: break out scopes when a let-else pattern fails to match
This PR will commit to a new behavior so that values from initializer expressions are dropped earlier when a let-else pattern fails to match.
Fix#98672.
Close#93951.
cc `@camsteffen` `@est31`
Fix thumbv4t-none-eabi frame pointer setting
The `thumb_base` profile has changed since I last remember seeing it, and now it sets the frame pointer to "always keep", which is not desired for this target. Hooking a debugger to the running program is not really done, it's preferable to have the register available for actual program use, so the default "may omit" is now set.
I thought that the target was already using "may omit" when I checked on it last month, because I forgot that the target was previously based on `thumb_base` rather than `Default::default()`. I only noticed the issue just now when creating the `armv4t-none-eabi` target (https://github.com/rust-lang/rust/pull/99226), though this PR is not in any way conditional on that one.
This is done by having the crossbeam dependency inserted into the
proc_macro server code from the server side, to avoid adding a
dependency to proc_macro.
In addition, this introduces a -Z command-line option which will switch
rustc to run proc-macros using this cross-thread executor. With the
changes to the bridge in #98186, #98187, #98188 and #98189, the
performance of the executor should be much closer to same-thread
execution.
In local testing, the crossbeam executor was substantially more
performant than either of the two existing CrossThread strategies, so
they have been removed to keep things simple.
Remove remaining uses of box syntax from librustdoc
Remove the remaining uses of box syntax from librustdoc. Followup of #99066 where these changes were split out because they were responsible for a small but noticeable regression. This PR avoids the regression by boxing some large variants of `ItemKind` to reduce the enum's size by half from 224 bytes to 112 bytes (on x86-64). This should also help with reducing memory usage.
Rollup of 8 pull requests
Successful merges:
- #99686 (add suggestion when there is a impl of external trait on pointer with wrong coherence rules)
- #99760 (doc/rustc: describe the uefi target platforms)
- #99766 (Htmldocck: Substitute the doc channel when blessing)
- #99781 (Use String::from_utf8_lossy in CStr demo)
- #99803 (Update mentions to `rustc_metadata::rmeta::Lazy`)
- #99845 (Remove `$` prefix for bash scripts in doc)
- #99850 (rustdoc: Remove more Clean trait implementations)
- #99872 (Clone the `src/llvm-project` submodule if profiling is enabled)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Clone the `src/llvm-project` submodule if profiling is enabled
To compile rustc with profiling information, `compiler-rt` from LLVM is required. Building it requires the `src/llvm-project` submodule to be initialized and updated.
Fixes#99869
Update mentions to `rustc_metadata::rmeta::Lazy`
While working on https://github.com/rust-lang/rustc-dev-guide/pull/1411, I noticed there are still some mentions of `Lazy`. This updates them to `LazyValue`, `LazyArray`, or `LazyTable`.
r? ````@compiler-errors````
Signed-off-by: Yuki Okushi <jtitor@2k36.org>
Htmldocck: Substitute the doc channel when blessing
Since #84942, the snippet `{{channel}}` gets substituted with the concrete “doc channel” (e.g. `https://doc.rust-lang.org/nightly`) when snapshot files are checked against the actual rustdoc output.
However, when you `--bless` rustdoc tests, htmldocck just dumps the concrete channel into the snapshot file and
you have to manually do a find-and-replace after blessing to uphold what #84942 set out to fix.
I admit it's a bit fragile to blindly replace URLs like this but I guess it's not too bad in practice.
Feel free to close this PR if you don't think that this is a good idea.
`@rustbot` label T-rustdoc A-testsuite
doc/rustc: describe the uefi target platforms
Add a `platform-support` entry to the rustc-docs for the different `*-unknown-uefi` targets. This describes in detail how this platform works, a few basic examples, and how to compile for the platform.
Red Hat is sponsoring my work on this platform, so I am putting myself down as target maintainer. Co-maintainers are more than welcome to join me in the effort. Communication is going on off-list to coordinate the different efforts.
Note that the ultimate goal is to move the UEFI targets to Tier-2 so bootloaders can be more easily supported in commercial products. This documentation is the first step towards that goal, but should be a viable documentation even for the current Tier-3 status of the targets.
I also want to point out that there is an ongoing GSoC-effort to port the rust standard library to UEFI (by Ayush Singh). While this work is not necessarily required to get to Tier-2, we definitely should coordinate the efforts and update the documentation as soon as any such ports are merged.
Note that the targets are already used by multiple commercial and non commercial production systems, including, but not limited to:
* Tianocore-EDK2 (Official UEFI SDK by Intel) comes with rust support
in its staging repository (not part of any release, yet).
(https://github.com/tianocore/edk2-staging/tree)
* Intel's research program "Project Mu" uses the rust UEFI targets to
show possible future replacements for Tianocore-EDK2.
* The Rust OS "Redox" uses the UEFI targets for its bootloader.
(https://www.redox-os.org/)
* The hugely popular in-depth documentation of OS development in Rust
by Philipp Oppermann uses the UEFI targets.
(https://os.phil-opp.com/)
