With this and rust-lang/rust-clippy#13084 our toml version will be
pushed to `0.9.7`. This is different from rustc's version, but the
changes in rust-lang/rust-clippy#13084 already require an incompatible
version.
The `serde` feature is also removed since it was only used in one spot
with a mostly trivial replacement.
changelog: none
Fix top level ui tests check in tidy
I got an error when pushing code:
```console
fmt check
fmt: checked 6330 modified files
tidy check
tidy [ui_tests (tests)]: ui tests should be added under meaningful subdirectories: `/Users/yukang/rust/tests/ui/.DS_Store`
tidy [ui_tests (tests)]: FAIL
```
I think it's better to use `ignore::WalkBuilder` for checking the path.
r? `@jieyouxu`
Don't normalize higher-ranked assumptions if they're not used
See the comment in the code.
Normalizing these assumptions may cause us to register things like new placeholder outlives obligations that cause higher-ranked lifetime errors, and this is problematic if we're not even using these assumptions in borrowck.
Fixesrust-lang/rust#147244Fixesrust-lang/rust#147285
illumos' `ld` does not support a flag like either SHF_GNU_RETAIN or
SHF_SUNW_NODISCARD, so there is no way to communicate `#[used(linker)]`
for that target. Setting `USED_LINKER` to try results in LLVM setting
SHF_SUNW_NODISCARD for Solaris-like targets, which is an unknown section
header flag for illumos `ld` and prevents sections from being merged
that otherwise would.
As a motivating example, the `inventory` crate produces
`#[used]` items to merge into `.init_array`. Because those items have an
unknown section header flag they are not merged with the default
`.init_array` with `frame_dummy`, and end up never executed.
Downgrading `#[used]` to `#[used(compiler)]` on illumos keeps
so-attributed items as preserved as they had been before
https://github.com/rust-lang/rust/pull/140872. As was the case before
that change, because rustc passes `-z ignore` to illumos `ld`, it's
possible that `used` sections are GC'd at link time.
https://github.com/rust-lang/rust/issues/146169 describes this
unfortunate circumstance.
This commit adds some documentation about the state of `-Cpanic=unwind`
for the following wasm targets:
* `wasm32-unknown-unknown`
* `wasm32-wasip1`
* `wasm32-wasip2`
* `wasm32v1-none`
Notably it's possible to use `-Cpanic=unwind` with `-Zbuild-std` and
it's also mentioned that there are no concrete proposals at this time to
adding a new set of targets which support unwinding. My hunch is that in
a few years' time it would make sense to enable it by default on these
targets (except for `wasm32v1-none`) but that's a problem for
future folks to debate. For now this is an attempt to document the
status quo.
Respect `-Z` unstable options in `rustdoc --test`
This PR makes rustdoc respect `-Z` unstable options when collecting doctests (`rustdoc --test`).
In the process I also realized that `--error-format` wasn't respected as well, making UI annotations impossible to write so I fixed that as well.
Best reviewed commit by commit.
Fixes https://github.com/rust-lang/rust/issues/147276
Fixes https://github.com/rust-lang/rust/issues/143930
r? fmease
only replace the intended comma in pattern suggestions
Only suggest to replace the intended comma, not all bars in the pattern.
Fixesrust-lang/rust#143330.
This continues rust-lang/rust#143331, the credit for making the fix goes to `@A4-Tacks.` I just blessed tests and added a regression test.
Fix backtraces with `-C panic=abort` on linux; emit unwind tables by default
The linux backtrace unwinder relies on unwind tables to work properly, and generating and printing a backtrace is done by for example the default panic hook.
Begin emitting unwind tables by default again with `-C panic=abort` (see history below) so that backtraces work.
Closes https://github.com/rust-lang/rust/issues/81902 which is **regression-from-stable-to-stable**
Closes https://github.com/rust-lang/rust/issues/94815
### History
Backtraces with `-C panic=abort` used to work in Rust 1.22 but broke in Rust 1.23, because in 1.23 we stopped emitting unwind tables with `-C panic=abort` (see https://github.com/rust-lang/rust/pull/45031 and https://github.com/rust-lang/rust/issues/81902#issuecomment-3046487084).
In 1.45 a workaround in the form of `-C force-unwind-tables=yes` was added (see https://github.com/rust-lang/rust/pull/69984).
`-C panic=abort` was added in [Rust 1.10](https://blog.rust-lang.org/2016/07/07/Rust-1.10/#what-s-in-1-10-stable) and the motivation was binary size and compile time. But given how confusing that behavior has turned out to be, it is better to make binary size optimization opt-in with `-C force-unwind-tables=no` rather than default since the current default breaks backtraces.
Besides, if binary size is a primary concern, there are many other tricks that can be used that has a higher impact.
# Release Note Entry Draft:
## Compatibility Notes
* [Fix backtraces with `-C panic=abort` on Linux by generating unwind tables by default](https://github.com/rust-lang/rust/pull/143613). Build with `-C force-unwind-tables=no` to keep omitting unwind tables.
try-job: aarch64-apple
try-job: armhf-gnu
try-job: aarch64-msvc-1
Introduce debuginfo to statements in MIR
The PR introduces support for debug information within dead statements. Currently, only the reference statement is supported, which is sufficient to fix rust-lang/rust#128081.
I don't modify Stable MIR, as I don't think we need debug information when using it.
This PR represents the debug information for the dead reference statement via `#dbg_value`. For example, `let _foo_b = &foo.b` becomes `#dbg_value(ptr %foo, !22, !DIExpression(DW_OP_plus_uconst, 4, DW_OP_stack_value), !26)`. You can see this here: https://rust.godbolt.org/z/d43js6adv.
The general principle for handling debug information is to never provide less debug information than the optimized LLVM IR.
The current rules for dropping debug information in this PR are:
- If the LLVM IR cannot represent a reference address, it's replaced with poison or simply dropped. For example, see: https://rust.godbolt.org/z/shGqPec8W. I'm using poison in all such cases now.
- All debuginfos is dropped when merging multiple successor BBs. An example is available here: https://rust.godbolt.org/z/TE1q3Wq6M.
I doesn't drop debuginfos in `MatchBranchSimplification`, because LLVM also pick one branch for it.
