remove unnecessary bound on Zip specialization impl
I originally added this bound in an attempt to make the specialization
sound for owning iterators but it was never correct here and the correct
and [already implemented](497ee321af/library/alloc/src/vec/into_iter.rs (L220-L232)) solution is is to place it on the IntoIter
implementation.
Alloc features cleanup
This sorts and categorizes the `#![features]` in `alloc` and removes unused ones.
This is part of #87766
The following feature attributes were unnecessary and are removed:
```diff
// Library features:
-#![feature(cow_is_borrowed)]
-#![feature(maybe_uninit_uninit_array)]
-#![feature(slice_partition_dedup)]
// Language features:
-#![feature(arbitrary_self_types)]
-#![feature(auto_traits)]
-#![feature(box_patterns)]
-#![feature(decl_macro)]
-#![feature(nll)]
```
Add support for artifact size profiling
This adds support for profiling artifact file sizes (incremental compilation artifacts and query cache to begin with).
Eventually we want to track this in perf.rlo so we can ensure that file sizes do not change dramatically on each pull request.
This relies on support in measureme: https://github.com/rust-lang/measureme/pull/169. Once that lands we can update this PR to not point to a git dependency.
This was worked on together with `@michaelwoerister.`
r? `@wesleywiser`
Automatic exponential formatting in Debug
Context: See [this comment from the libs team](https://github.com/rust-lang/rfcs/pull/2729#issuecomment-853454204)
---
Makes `"{:?}"` switch to exponential for floats based on magnitude. The libs team suggested exploring this idea in the discussion thread for RFC rust-lang/rfcs#2729. (**note:** this is **not** an implementation of the RFC; it is an implementation of one of the alternatives)
Thresholds chosen were 1e-4 and 1e16. Justification described [here](https://github.com/rust-lang/rfcs/pull/2729#issuecomment-864482954).
**This will require a crater run.**
---
As mentioned in the commit message of 8731d4dfb4, this behavior will not apply when a precision is supplied, because I wanted to preserve the following existing and useful behavior of `{:.PREC?}` (which recursively applies `{:.PREC}` to floats in a struct):
```rust
assert_eq!(
format!("{:.2?}", [100.0, 0.000004]),
"[100.00, 0.00]",
)
```
I looked around and am not sure where there are any tests that actually use this in the test suite, though?
All things considered, I'm surprised that this change did not seem to break even a single existing test in `x.py test --stage 2`. (even when I tried a smaller threshold of 1e6)
Adopt let_else across the compiler
This performs a substitution of code following the pattern:
```
let <id> = if let <pat> = ... { identity } else { ... : ! };
```
To simplify it to:
```
let <pat> = ... { identity } else { ... : ! };
```
By adopting the `let_else` feature (cc #87335).
The PR also updates the syn crate because the currently used version of the crate doesn't support `let_else` syntax yet.
Note: Generally I'm the person who *removes* usages of unstable features from the compiler, not adds more usages of them, but in this instance I think it hopefully helps the feature get stabilized sooner and in a better state. I have written a [comment](https://github.com/rust-lang/rust/issues/87335#issuecomment-944846205) on the tracking issue about my experience and what I feel could be improved before stabilization of `let_else`.
Update cargo
6 commits in c7957a74bdcf3b11e7154c1a9401735f23ebd484..7fbbf4e8f23e3c24b8afff541dcb17e53eb5ff88
2021-10-11 20:17:07 +0000 to 2021-10-19 02:16:48 +0000
- Make future-incompat-report output more user-friendly (rust-lang/cargo#9953)
- Fix fetching git repos after a force push. (rust-lang/cargo#9979)
- Add rustc-link-args to doctest build (rust-lang/cargo#9916)
- Add the start of a basic benchmarking suite. (rust-lang/cargo#9955)
- Use forms for issue templates. (rust-lang/cargo#9970)
- Add rust_metadata to SerializedPackage (rust-lang/cargo#9967)
Fix wrong niche calculation when 2+ niches are placed at the start
When the niche is at the start, existing code incorrectly uses 1 instead of count for subtraction.
Fix#90038
`@rustbot` label: T-compiler
Rollup of 8 pull requests
Successful merges:
- #89766 (RustWrapper: adapt for an LLVM API change)
- #89867 (Fix macro_rules! duplication when reexported in the same module)
- #89941 (removing TLS support in x86_64-unknown-none-hermitkernel)
- #89956 (Suggest a case insensitive match name regardless of levenshtein distance)
- #89988 (Do not promote values with const drop that need to be dropped)
- #89997 (Add test for issue #84957 - `str.as_bytes()` in a `const` expression)
- #90002 (⬆️ rust-analyzer)
- #90034 (Tiny tweak to Iterator::unzip() doc comment example.)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Tiny tweak to Iterator::unzip() doc comment example.
It's easier to figure out what it's doing and which output elements map to which input ones if the matrix we are dealing with is rectangular 2x3 rather than square 2x2.
Add test for issue #84957 - `str.as_bytes()` in a `const` expression
Hi, this PR adds a test for issue #84957 . I'm quite new to rustc so let me know if there's anything else that needs doing 😄Closes#84957
Do not promote values with const drop that need to be dropped
Changes from #88558 allowed using `~const Drop` in constants by
introducing a new `NeedsNonConstDrop` qualif.
The new qualif was also used for promotion purposes, and allowed
promotion to happen for values that needs to be dropped but which
do have a const drop impl.
Since for promoted the drop implementation is never executed,
this lead to observable change in behaviour. For example:
```rust
struct Panic();
impl const Drop for Panic {
fn drop(&mut self) {
panic!();
}
}
fn main() {
let _ = &Panic();
}
```
Restore the use of `NeedsDrop` qualif during promotion to avoid the issue.
Suggest a case insensitive match name regardless of levenshtein distance
Fixes#86170
Currently, `find_best_match_for_name` only returns a case insensitive match name depending on a Levenshtein distance. It's a bit unfortunate that that hides some suggestions for typos like `Bar` -> `BAR`. That idea is from https://github.com/rust-lang/rust/pull/46347#discussion_r153701834, but I think it still makes some sense to show a candidate when we find a case insensitive match name as it's more like a typo.
Skipped the `candidate != lookup` check because the current (i.e, `levenshtein_match`) returns the exact same `Symbol` anyway but it doesn't seem to confuse anything on UI tests.
r? ``@estebank``
removing TLS support in x86_64-unknown-none-hermitkernel
HermitCore's kernel itself doesn't support TLS. Consequently, the entries in x86_64-unknown-none-hermitkernel should be removed. This commit should help to finalize #89062.
Fix macro_rules! duplication when reexported in the same module
This can append if within the same module a `#[macro_export] macro_rules!`
is declared but also a reexport of itself producing two export of the same
macro in the same module. In that case we only want to document it once.
Before:
```
Module {
is_crate: true,
items: [
Id("0:4"), // pub use crate::repro as repro2;
Id("0:3"), // macro_rules! repro
Id("0:3"), // duplicate, same as above
],
}
```
After:
```
Module {
is_crate: true,
items: [
Id("0:4"), // pub use crate::repro as repro2;
Id("0:3"), // macro_rules! repro
],
}
```
Fixes https://github.com/rust-lang/rust/issues/89852
RustWrapper: adapt for an LLVM API change
No functional changes intended.
The LLVM commit
89b57061f7
moved TargetRegistry.(h|cpp) from Support to MC.
This adapts RustWrapper accordingly.
Revert "Auto merge of #89709 - clemenswasser:apply_clippy_suggestions…
…_2, r=petrochenkov"
The PR had some unforseen perf regressions that are not as easy to find.
Revert the PR for now.
This reverts commit 6ae8912a3e, reversing
changes made to 86d6d2b738.
It's easier to figure out what it's doing and which output
elements map to which input ones if the matrix we are dealing
with is rectangular 2x3 rather than square 2x2.
Remove redundant member-constraint check
impl trait will, for each lifetime in the hidden type, register a "member constraint" that says the lifetime must be equal or outlive one of the lifetimes of the impl trait. These member constraints will be solved by borrowck
But, as you can see in the big red block of removed code, there was an ad-hoc check for member constraints happening at the site where they get registered. This check had some minor effects on diagnostics, but will fall down on its feet with my big type alias impl trait refactor. So we removed it and I pulled the removal out into a (hopefully) reviewable PR that works on master directly.
Changes from #88558 allowed using `~const Drop` in constants by
introducing a new `NeedsNonConstDrop` qualif.
The new qualif was also used for promotion purposes, and allowed
promotion to happen for values that needs to be dropped but which
do have a const drop impl.
Since for promoted the drop implementation is never executed,
this lead to observable change in behaviour. For example:
```rust
struct Panic();
impl const Drop for Panic {
fn drop(&mut self) {
panic!();
}
}
fn main() {
let _ = &Panic();
}
```
Restore the use of `NeedsDrop` qualif during promotion to avoid the issue.
Index and hash HIR as part of lowering
Part of https://github.com/rust-lang/rust/pull/88186
~Based on https://github.com/rust-lang/rust/pull/88880 (see merge commit).~
Once HIR is lowered, it is later indexed by the `index_hir` query and hashed for `crate_hash`. This PR moves those post-processing steps to lowering itself. As a side objective, the HIR crate data structure is refactored as an `IndexVec<LocalDefId, Option<OwnerInfo<'hir>>>` where `OwnerInfo` stores all the relevant information for an HIR owner.
r? `@michaelwoerister`
cc `@petrochenkov`
rustc_span: `Ident::invalid` -> `Ident::empty`
The equivalent for `Symbol`s was renamed some time ago (`kw::Invalid` -> `kw::Empty`), and it makes sense to do the same thing for `Ident`s as well.
Nicer error message if the user attempts to do let...else if
Gives a nice "conditional `else if` is not supported for `let...else`" error when encountering a `let...else if` pattern, as suggested in the [let...else tracking issue](https://github.com/rust-lang/rust/issues/87335#issuecomment-944846205).
bootstrap: tweak verbosity settings
Currently the verbosity settings are:
- 2: RUSTC-SHIM envvars get spammed on every invocation, O(30) lines
cargo is passed -v which outputs CLI invocations, O(5) lines
- 3: cargo is passed -vv which outputs build script output, O(0-10) lines
This commit changes it to:
- 1: cargo is passed -v, O(5) lines
- 2: cargo is passed -vv, O(10) lines
- 3: RUSTC-SHIM envvars get spammed, O(30) lines
Split out LLVM PGO step and use clang 13 to compile LLVM
We're seeing a PGO version mismatch error in CI logs:
LLVM Profile Error: Runtime and instrumentation version mismatch : expected 5, but get 7
which is likely due to the version bumped here differing from that used by
rustc.
This PR fixes this by splitting out the PGO step for LLVM into a separate phase of the pgo.sh script, which nets no change to performance (see [these results](https://perf.rust-lang.org/compare.html?start=c34ac8747ca96d09cb08b8f5adddead826e77c06&end=e272c2af45f40c74dab83948235903ffbe3ad57f)). Then, it follows that up with an upgrade to LLVM/clang version 13 as our bootstrap compiler, which yields the performance improvements for this PR -- around 5%. This depends on the first step here, because otherwise we end up somehow clobbering or otherwise hurting our ability to effectively collect performance data, yielding reductions in performance for a subset of benchmarks -- it is not clear what the cause here was precisely, but the split only costs ~10 minutes and seems worthwhile.
