Merge generics and where predicates and prevent duplicates in where predicates
Part of #104886 (I didn't include bounds from parent trait yet as I think the PR is already big enough).
Also we'll need to run a perf check.
cc `@fmease` since you worked a bit on this.
r? `@notriddle`
Rollup of 7 pull requests
Successful merges:
- #104903 (Use ocx.normalize in report_projection_error)
- #105032 (improve doc of into_boxed_slice and impl From<Vec<T>> for Box<[T]>)
- #105100 (Add missing intra-doc link)
- #105181 (Don't add a note for implementing a trait if its inner type is erroneous)
- #105182 (Rustdoc-Json: Don't inline foreign traits)
- #105188 (Don't elide type information when printing E0308 with `-Zverbose`)
- #105189 (rustdoc: clean up redundant CSS on `.rustdoc-toggle.hideme`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Don't elide type information when printing E0308 with `-Zverbose`
When we pass `-Zverbose`, we kinda expect for all `_` to be replaced with more descriptive information, for example --
```
= note: expected fn pointer `fn(_, u32)`
found fn item `fn(_, i32) {foo}`
```
Where `_` is the "identical" part of the fn signatures, now gets rendered as:
```
= note: expected fn pointer `fn(i32, u32)`
found fn item `fn(i32, i32) {foo}`
```
improve doc of into_boxed_slice and impl From<Vec<T>> for Box<[T]>
Improves description of `into_boxed_slice`, and adds example to `impl From<Vec<T>> for Box<[T]>`.
Fixes#98908
9 commits in e027c4b5d25af2119b1956fac42863b9b3242744..f6e737b1e3386adb89333bf06a01f68a91ac5306
2022-11-25 19:44:46 +0000 to 2022-12-02 20:21:24 +0000
- Refactor generate_targets into separate module (rust-lang/cargo#11445)
- Improve file found in multiple build targets warning (rust-lang/cargo#11299)
- Error when precise without -p flag (rust-lang/cargo#11349)
- Improve strategy for selecting targets to be scraped for examples (rust-lang/cargo#11430)
- Aware of compression ratio for unpack size limit (rust-lang/cargo#11337)
- Add test for rustdoc-map generation when using sparse registries (rust-lang/cargo#11403)
- Add error message when `cargo fix` on an empty repo (rust-lang/cargo#11400)
- Store the sparse+ prefix in the SourceId for sparse registries (rust-lang/cargo#11387)
- Update documentation for -Zrustdoc-scrape-examples in the Cargo Book (rust-lang/cargo#11425)
Check lifetime param count in `collect_trait_impl_trait_tys`
We checked the type and const generics count, but not the lifetimes, which were handled in a different function.
Fixes#105154
rustdoc: clean up help and settings button CSS
The old version of this code specified a bunch of different numbers that had to line up just right to get the size it wanted. This version uses flexbox centering, specifies the font size, and lets the browser figure out the rest of the layout automatically.
Preview: http://notriddle.com/notriddle-rustdoc-demos/flexbox-help-settings-buttons/test_dingus/
sparc-struct-abi: work around new tail-call optimization
Upstream LLVM change https://reviews.llvm.org/D138741 introduced some new tail-call smarts for SPARC which broke some of the checks in this test. Rather than adjust the test expectations, we add an extra no-args function that can get tail-called or not without hurting the needs of the test.
r? ``@nikic``
Adjust inlining attributes around panic_immediate_abort
The goal of `panic_immediate_abort` is to permit the panic runtime and formatting code paths to be optimized away. But while poking through some disassembly of a small program compiled with that option, I found that was not the case. Enabling LTO did address that specific issue, but enabling LTO is a steep price to pay for this feature doing its job.
This PR fixes that, by tweaking two things:
* All the slice indexing functions that we `const_eval_select` on get `#[inline]`. `objdump -dC` told me that originally some `_ct` functions could end up in an executable. I won't pretend to understand what's going on there.
* Normalize attributes across all `panic!` wrappers: use `inline(never) + cold` normally, and `inline` when `panic_immediate_abort` is enabled.
But also, with LTO and `panic_immediate_abort` enabled, this patch knocks ~709 kB out of the `.text` segment of `librustc_driver.so`. That is slightly surprising to me, my best theory is that this shifts some inlining earlier in compilation, enabling some subsequent optimizations. The size improvement of `librustc_driver.so` with `panic_immediate_abort` due to this patch is greater with LTO than without LTO, which I suppose backs up this theory.
I do not know how to test this. I would quite like to, because I think what this is solving was an accidental regression. This only works with `-Zbuild-std` which is a cargo flag, and thus can't be used in a rustc codegen test.
r? `@thomcc`
---
I do not seriously think anyone is going to use a compiler built with `panic_immediate_abort`, but I wanted a big complicated Rust program to try this out on, and the compiler is such.
Add `type_ascribe!` macro as placeholder syntax for type ascription
This makes it still possible to test the internal semantics of type ascription even once the `:`-syntax is removed from the parser. The macro now gets used in a bunch of UI tests that test the semantics and not syntax of type ascription.
I might have forgotten a few tests but this should hopefully be most of them. The remaining ones will certainly be found once type ascription is removed from the parser altogether.
Part of #101728
rustc_ast_lowering: Stop lowering imports into multiple items
Lower them into a single item with multiple resolutions instead.
This also allows to remove additional `NodId`s and `DefId`s related to those additional items.
This avoids calling `early_lint_node` twice.
Note: one `early_lint_node` call had `!pre_expansion` for the second
argument and the other had `false`. The new single call just has
`!pre_expansion`. This results in a reduction of duplicate error
messages in some `ui-fulldeps` tests. The order of some `ui-fulldeps`
output also changes, but that doesn't matter.
