Rollup of 8 pull requests #85458
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Rollup of 8 pull requests #85458
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The default of --allow-unused-prefixes used to be false, but in LLVM change 87dbdd2 (https://reviews.llvm.org/D95849) the default became true. I'm not quite sure how we could do better here (specifically not providing the CHECK prefix when it's not needed), but this seems to work for now.
LinkerFlavor::Gcc does not always mean GNU ld specifically. And in the case of at least the solaris ld in illumos, that flag is unrecognized and will cause the linking step to fail.
… also indicate linker_is_gnu.
This fixes the `#[must_use = ...]` on `Option::is_none` to have a working suggestion.
# Stabilization report
## Summary
This stabilizes using macro expansion in key-value attributes, like so:
```rust
#[doc = include_str!("my_doc.md")]
struct S;
#[path = concat!(env!("OUT_DIR"), "/generated.rs")]
mod m;
```
See the changes to the reference for details on what macros are allowed;
see Petrochenkov's excellent blog post [on internals](https://internals.rust-lang.org/t/macro-expansion-points-in-attributes/11455)
for alternatives that were considered and rejected ("why accept no more
and no less?")
This has been available on nightly since 1.50 with no major issues.
## Notes
### Accepted syntax
The parser accepts arbitrary Rust expressions in this position, but any expression other than a macro invocation will ultimately lead to an error because it is not expected by the built-in expression forms (e.g., `#[doc]`). Note that decorators and the like may be able to observe other expression forms.
### Expansion ordering
Expansion of macro expressions in "inert" attributes occurs after decorators have executed, analogously to macro expressions appearing in the function body or other parts of decorator input.
There is currently no way for decorators to accept macros in key-value position if macro expansion must be performed before the decorator executes (if the macro can simply be copied into the output for later expansion, that can work).
## Test cases
- https://github.com/rust-lang/rust/blob/master/src/test/ui/attributes/key-value-expansion-on-mac.rs
- https://github.com/rust-lang/rust/blob/master/src/test/rustdoc/external-doc.rs
The feature has also been dogfooded extensively in the compiler and
standard library:
- rust-lang#83329
- rust-lang#83230
- rust-lang#82641
- rust-lang#80534
## Implementation history
- Initial proposal: rust-lang#55414 (comment)
- Experiment to see how much code it would break: rust-lang#67121
- Preliminary work to restrict expansion that would conflict with this
feature: rust-lang#77271
- Initial implementation: rust-lang#78837
- Fix for an ICE: rust-lang#80563
## Unresolved Questions
~~rust-lang#83366 (comment) listed some concerns, but they have been resolved as of this final report.~~
## Additional Information
There are two workarounds that have a similar effect for `#[doc]`
attributes on nightly. One is to emulate this behavior by using a limited version of this feature that was stabilized for historical reasons:
```rust
macro_rules! forward_inner_docs {
($e:expr => $i:item) => {
#[doc = $e]
$i
};
}
forward_inner_docs!(include_str!("lib.rs") => struct S {});
```
This also works for other attributes (like `#[path = concat!(...)]`).
The other is to use `doc(include)`:
```rust
#![feature(external_doc)]
#[doc(include = "lib.rs")]
struct S {}
```
The first works, but is non-trivial for people to discover, and
difficult to read and maintain. The second is a strange special-case for
a particular use of the macro. This generalizes it to work for any use
case, not just including files.
I plan to remove `doc(include)` when this is stabilized. The
`forward_inner_docs` workaround will still compile without warnings, but
I expect it to be used less once it's no longer necessary.
…=petrochenkov Stabilize extended_key_value_attributes Closes rust-lang#44732. Closes rust-lang#78835. Closes rust-lang#82768 (by making it irrelevant). # Stabilization report ## Summary This stabilizes using macro expansion in key-value attributes, like so: ```rust #[doc = include_str!("my_doc.md")] struct S; #[path = concat!(env!("OUT_DIR"), "/generated.rs")] mod m; ``` See Petrochenkov's excellent blog post [on internals](https://internals.rust-lang.org/t/macro-expansion-points-in-attributes/11455) for alternatives that were considered and rejected ("why accept no more and no less?") This has been available on nightly since 1.50 with no major issues. ## Notes ### Accepted syntax The parser accepts arbitrary Rust expressions in this position, but any expression other than a macro invocation will ultimately lead to an error because it is not expected by the built-in expression forms (e.g., `#[doc]`). Note that decorators and the like may be able to observe other expression forms. ### Expansion ordering Expansion of macro expressions in "inert" attributes occurs after decorators have executed, analogously to macro expressions appearing in the function body or other parts of decorator input. There is currently no way for decorators to accept macros in key-value position if macro expansion must be performed before the decorator executes (if the macro can simply be copied into the output for later expansion, that can work). ## Test cases - https://github.com/rust-lang/rust/blob/master/src/test/ui/attributes/key-value-expansion-on-mac.rs - https://github.com/rust-lang/rust/blob/master/src/test/rustdoc/external-doc.rs The feature has also been dogfooded extensively in the compiler and standard library: - rust-lang#83329 - rust-lang#83230 - rust-lang#82641 - rust-lang#80534 ## Implementation history - Initial proposal: rust-lang#55414 (comment) - Experiment to see how much code it would break: rust-lang#67121 - Preliminary work to restrict expansion that would conflict with this feature: rust-lang#77271 - Initial implementation: rust-lang#78837 - Fix for an ICE: rust-lang#80563 ## Unresolved Questions ~~rust-lang#83366 (comment) listed some concerns, but they have been resolved as of this final report.~~ ## Additional Information There are two workarounds that have a similar effect for `#[doc]` attributes on nightly. One is to emulate this behavior by using a limited version of this feature that was stabilized for historical reasons: ```rust macro_rules! forward_inner_docs { ($e:expr => $i:item) => { #[doc = $e] $i }; } forward_inner_docs!(include_str!("lib.rs") => struct S {}); ``` This also works for other attributes (like `#[path = concat!(...)]`). The other is to use `doc(include)`: ```rust #![feature(external_doc)] #[doc(include = "lib.rs")] struct S {} ``` The first works, but is non-trivial for people to discover, and difficult to read and maintain. The second is a strange special-case for a particular use of the macro. This generalizes it to work for any use case, not just including files. I plan to remove `doc(include)` when this is stabilized (rust-lang#82539). The `forward_inner_docs` workaround will still compile without warnings, but I expect it to be used less once it's no longer necessary.
Fix v0 symbol mangling bug Fixes rust-lang#83611. r? ``@jackh726``
compiletest: "fix" FileCheck with --allow-unused-prefixes The default of --allow-unused-prefixes used to be false, but in LLVM change 87dbdd2 (https://reviews.llvm.org/D95849) the default became true. I'm not quite sure how we could do better here (specifically not providing the CHECK prefix when it's not needed), but this seems to work for now. This reduces codegen test failures against LLVM HEAD from 31 cases to 5.
…r=petrochenkov Only pass --[no-]gc-sections if linker is GNU ld. Fixes a regression from rust-lang#84468 where linking now fails with solaris linkers. LinkerFlavor::Gcc does not always mean GNU ld specifically. And in the case of at least the solaris ld in illumos, that flag is unrecognized and will cause the linking step to fail. Even though removing the `is_like_solaris` branch from `gc_sections` in rust-lang#84468 made sense as `-z ignore/record` are more analogous to the `--[no-]-as-needed` flags, it inadvertently caused solaris linkers to be passed the `--gc-sections` flag. So let's just change it to be more explicit about when we pass those flags.
bootstrap: build cargo only if requested in tools In Debian we'd like to build rustfmt and clippy alongside rustc, but we're still excluding cargo from the rustc build and doing that separately. This patch makes that possible.
…eGomez rustdoc: restore header sizes The `<details>` toggle work changed the relationship from #main to the top-doc docblock so it was no longer a parent relationship but a great-grandparent relationship. This updates the CSS rules that set the heading sizes so they still apply. Fixes rust-lang#85389 r? ``@camelid``
Fix must_use on `Option::is_none` This fixes the `#[must_use = ...]` on `Option::is_none` to have a working suggestion.
… r=jsha Fix escape handling Currently, when we press Escape while on the search results, nothing is happening, this PR fixes it. More information: it's because in case the element doesn't exist, `hasClass` will return `null`, which coerces into `false` with the `!` comparison operator. But even if it returned `false`, it would still be an issue because if the element doesn't exist, it means it's hidden so in this case it's just as good, hence the additional check I added. r? ``@jsha``
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@bors r+ rollup=never p=8 |
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📌 Commit 6cfcbf7 has been approved by |
bors
added
the
S-waiting-on-bors
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☀️ Test successful - checks-actions |
This was referenced May 19, 2021
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Successful merges:
Option::is_none#85425 (Fix must_use onOption::is_none)Failed merges:
r? @ghost
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