lower pattern bindings in the order they're written and base drop order on primary bindings' order
To fixrust-lang/rust#142163, this PR does two things:
- Makes match arms base their drop order on the first sub-branch instead of the last sub-branch. Together with the second change, this makes bindings' drop order correspond to the relative order of when each binding first appears (i.e. the order of the "primary" bindings).
- Lowers pattern bindings in the order they're written (still treating the right-hand side of a ``@`` as coming before the binding on the left). In each sub-branch of a match arm, this is the order that would be obtained if the or-alternatives chosen in that sub-branch were inlined into the arm's pattern. This both affects drop order (making bindings in or-patterns not be dropped first) and fixes the issue in [this test](2a023bf80a/tests/ui/pattern/bindings-after-at/bind-by-copy-or-pat.rs) from rust-lang/rust#121716.
My approach to the second point is admittedly a bit trickier than may be necessary. To avoid passing around a counter when building `FlatPat`s, I've instead added just enough information to recover the original structure of the pattern's bindings from a `MatchTreeSubBranch`'s path through the `Candidate` tree. Some alternatives:
- We could use a counter, then sort bindings by their ordinals when making `MatchTreeSubBranch`es.
- I'd like to experiment with always merging sub-candidates and removing `test_remaining_match_pairs_after_or`; that would require lowering bindings and guards in a different way. That makes it a bigger change too, though, so I figure it might be simplest to start here.
- For a very big change, we could track which or-alternatives succeed at runtime to base drop order on the binding order in the particular alternatives matched.
This is a breaking change. It will need a crater run, language team sign-off, and likely updates to the Reference.
This will conflict with rust-lang/rust#143376 and probably also rust-lang/rust#143028, so they shouldn't be merged at the same time.
r? `@matthewjasper` or `@Nadrieril`
emit `StorageLive` and schedule `StorageDead` for `let`-`else`'s bindings after matching
This PR removes special handling of `let`-`else`, so that `StorageLive`s are emitted and `StorageDead`s are scheduled only after pattern-matching has succeeded. This means `StorageDead`s will no longer appear for all of its bindings on the `else` branch (because they're not live yet) and its drops&`StorageDead`s will happen together like they do elsewhere, rather than having all drops first, then all `StorageDead`s.
This fixesrust-lang/rust#142056, and is therefore a breaking change. I believe it'll need a crater run and a T-lang nomination/fcp thereafter. Specifically, this makes drop-checking slightly more restrictive for `let`-`else` to match the behavior of other variable binding forms. An alternative approach could be to change the relative order of drops and `StorageDead`s for other binding forms to make drop-checking more permissive, but making that consistent would be a significantly more involved change.
r? mir
cc `````@dingxiangfei2009`````
`````@rustbot````` label +T-lang +needs-crater
Tweak auto trait errors
Make suggestions to remove params and super traits verbose and make spans more accurate.
```
error[E0567]: auto traits cannot have generic parameters
--> $DIR/auto-trait-validation.rs:6:19
|
LL | auto trait Generic<T> {}
| -------^^^
| |
| auto trait cannot have generic parameters
error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/auto-trait-validation.rs:8:20
|
LL | auto trait Bound : Copy {}
| ----- ^^^^
| |
| auto traits cannot have super traits or lifetime bounds
```
```
error[E0380]: auto traits cannot have associated items
--> $DIR/issue-23080.rs:5:8
|
LL | unsafe auto trait Trait {
| ----- auto traits cannot have associated items
LL | fn method(&self) {
| ^^^^^^
```
Revert "Preserve the .debug_gdb_scripts section"
https://github.com/rust-lang/rust/pull/143679 introduces a significant build time perf regression for ripgrep. Let's revert it such that we can investigate it without pressure.
Broken by #144776; this is reachable after all.
Fixes#144994.
The commit also adds a lot more cases to the `type-name-basic.rs`,
because it's currently very anaemic. This includes some cases where
region omission does very badly; these are marked with FIXME.
Print thread ID in panic message
`panic!` does not print any identifying information for threads that are
unnamed. However, in many cases, the thread ID can be determined.
This changes the panic message from something like this:
thread '<unnamed>' panicked at src/main.rs:3:5:
explicit panic
To something like this:
thread '<unnamed>' (12345) panicked at src/main.rs:3:5:
explicit panic
Stack overflow messages are updated as well.
This change applies to both named and unnamed threads. The ID printed is
the OS integer thread ID rather than the Rust thread ID, which should
also be what debuggers print.
try-job: aarch64-apple
try-job: aarch64-gnu
try-job: dist-apple-various
try-job: dist-various-*
try-job: dist-x86_64-freebsd
try-job: dist-x86_64-illumos
try-job: dist-x86_64-netbsd
try-job: dist-x86_64-solaris
try-job: test-various
try-job: x86_64-gnu
try-job: x86_64-mingw-1
try-job: x86_64-msvc-1
`panic!` does not print any identifying information for threads that are
unnamed. However, in many cases, the thread ID can be determined.
This changes the panic message from something like this:
thread '<unnamed>' panicked at src/main.rs:3:5:
explicit panic
To something like this:
thread '<unnamed>' (0xff9bf) panicked at src/main.rs:3:5:
explicit panic
Stack overflow messages are updated as well.
This change applies to both named and unnamed threads. The ID printed is
the OS integer thread ID rather than the Rust thread ID, which should
also be what debuggers print.
Fix rustdoc scrape examples crash
Fixesrust-lang/rust#144752.
The regression was introduced in https://github.com/rust-lang/rust/pull/144600. Although I don't understand why it is an issue currently, this allows to bypass the failure for now until we can figure out what's wrong as it's currently blocking new `bevy`'s release.
cc `@alice-i-cecile`
r? `@fmease`
Fortify generic param default checks
* Hard-reject instead of lint-reject type param defaults in generic assoc consts (GACs) (feature: `generic_const_items`).
* In https://github.com/rust-lang/rust/pull/113522, I explicitly handled the free const item case and forgot about the assoc const one.
* This led rustc to assume the default of emitting the deny-by-default lint `invalid_type_param_default`.
* GCIs are unstable, thus we're not bound by backward compat
* Hard-reject instead of lint-reject type param defaults in foreign items.
* We already hard-reject generic params on foreign items, so this isn't a breaking change.
* There's no reason why we need to lint-reject.
* Refactor the way we determine where generic param defaults are allowed:
* Don't default to emitting lint `invalid_type_param_defaults` for nodes that aren't explicitly handled but instead panic.
* This would've caught my GAC oversight from above much earlier via fuzzing
* Prevents us from accidentally stabilizing more invalid type param defaults in the future
* Streamline the phrasing of the diagnostic
rustdoc: fix caching of intra-doc links on reexports
previously two reexports of the same item would share a set of intra-doc links, which would cause problems if they had two different links with the same text. this was fixed by using the reexport defid as the key, if it is available.
fixes https://github.com/rust-lang/rust/issues/144965
Enforce tail call type is related to body return type in borrowck
Like all call terminators, tail call terminators instantiate the binder of the callee signature with region variables and equate the arg operand types with that signature's args to ensure that the call is valid.
However, unlike normal call terminators, we were forgetting to also relate the return type of the call terminator to anything. In the case of tail call terminators, the correct thing is to relate it to the return type of the caller function (or in other words, the return local `_0`).
This meant that if the caller's return type had some lifetime constraint, then that constraint wouldn't flow through the signature and affect the args.
This is what's happening in the example test I committed:
```rust
fn link(x: &str) -> &'static str {
become passthrough(x);
}
fn passthrough<T>(t: T) -> T { t }
fn main() {
let x = String::from("hello, world");
let s = link(&x);
drop(x);
println!("{s}");
}
```
Specifically, the type `x` is `'?0 str`, where `'?0` is some *universal* arg. The type of `passthrough` is `fn(&'?1 str) -> &'?1 str`. Equating the args sets `'?0 = '?1`. However, we need to also equate the return type `&'?1 str` to `&'static str` so that we eventually require that `'?0 = 'static`, which is a borrowck error!
-----
Look at the first commit for the functional change, and the second commit is just a refactor because we don't need to pass `Option<BasicBlock>` to `check_call_dest`, but just whether or not the terminator is expected to be diverging (i.e. if the return type is `!`).
Fixesrust-lang/rust#144916
Parser: Recover from attributes applied to types and generic args
r? compiler
Add clearer error messages for invalid attribute usage in types or generic types
fixesrust-lang/rust#135017fixesrust-lang/rust#144132
If the baseline s390x cpu is changed to a newer variant, such as z13,
the vector feature may be enabled by default. When rust is packaged
on fedora 38 and newer, it is set to z13.
Explicitly disable vector support on the baseline test for consistent
results across s390x cpus.
Rollup of 12 pull requests
Successful merges:
- rust-lang/rust#144552 (Rehome 33 `tests/ui/issues/` tests to other subdirectories under `tests/ui/`)
- rust-lang/rust#144676 (Add documentation for unstable_feature_bound)
- rust-lang/rust#144836 (Change visibility of Args new function)
- rust-lang/rust#144910 (Add regression tests for seemingly fixed issues)
- rust-lang/rust#144913 ([rustdoc] Fix wrong `i` tooltip icon)
- rust-lang/rust#144924 (compiletest: add hint for when a ui test produces no errors)
- rust-lang/rust#144926 (Correct the use of `must_use` on btree::IterMut)
- rust-lang/rust#144928 (Drop `rust-version` from `rustc_thread_pool`)
- rust-lang/rust#144945 (Autolabel PRs that change explicit tail call tests as `F-explicit_tail_calls`)
- rust-lang/rust#144954 (run-make: Allow blessing snapshot files that don't exist yet)
- rust-lang/rust#144971 (num: Rename `isolate_most_least_significant_one` functions)
- rust-lang/rust#144978 (Fix some doc links for intrinsics)
r? `@ghost`
`@rustbot` modify labels: rollup
Rehome 33 `tests/ui/issues/` tests to other subdirectories under `tests/ui/`
rust-lang/rust#143902 divided into smaller, easier to review chunks.
Part of rust-lang/rust#133895
Methodology:
1. Refer to the previously written `tests/ui/SUMMARY.md`
2. Find an appropriate category for the test, using the original issue thread and the test contents.
3. Add the issue URL at the bottom (not at the top, as that would mess up stderr line numbers)
4. Rename the tests to make their purpose clearer
Inspired by the methodology that ``@Kivooeo`` was using.
r? ``@jieyouxu``
Instead of collecting pretty printers transitively when building
executables/staticlibs/cdylibs, let the debugger find each crate's
pretty printers via its .debug_gdb_scripts section. This covers the case
where libraries defining custom pretty printers are loaded dynamically.
Make sure that compiler and linker don't optimize the section's contents
away by adding the global holding the data to "llvm.used". The volatile
load in the main shim is retained because "llvm.used", which translates
to SHF_GNU_RETAIN on ELF targets, requires a reasonably recent linker;
emitting the volatile load ensures compatibility with older linkers, at
least when libstd is used.
Pretty printers in dylib dependencies are now emitted by the main crate
instead of the dylib; apart from matching how rlibs are handled, this
approach has the advantage that `omit_gdb_pretty_printer_section` keeps
working with dylib dependencies.
Delete `tests/ui/threads-sendsync/tcp-stress.rs`
This stress test was originally introduced in 65cca4bd3f to detect a UAF in `libuv` (see rust-lang/rust#12823), but we no longer use `libuv`, so remove this test as it no longer serves its original purpose, and is causing flaky timeout failures.
Closesrust-lang/rust#144878 (by removing the test).
r? libs
coverage: Various small cleanups
This PR is a collection of small coverage-related changes that I accumulated while working towards other coverage improvements.
Each change should hopefully be fairly straightforward.
