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Remove -Zemscripten-wasm-eh - #156928

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Jun 3, 2026
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Remove -Zemscripten-wasm-eh#156928
rust-bors[bot] merged 1 commit into
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bjorn3:emscripten_always_wasm_eh

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@bjorn3

@bjorn3 bjorn3 commented May 25, 2026

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This was necessary when transitioning from JS to wasm exception handling on Emscripten. Enough time has probably passed that we no longer need to support JS exception handling on Emscripten. This enables cleaning up a fair bit of code.

This is the final step of #112195.

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rustbot commented May 25, 2026

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Some changes occurred in cfg and check-cfg configuration

cc @Urgau

@rustbot rustbot added A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels May 25, 2026
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r? @TaKO8Ki

rustbot has assigned @TaKO8Ki.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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/// Allows using anonymous lifetimes in argument-position impl-trait.
(unstable, anonymous_lifetime_in_impl_trait, "1.63.0", None),
/// Allows access to the emscripten_wasm_eh config, used by panic_unwind and unwind
(internal, cfg_emscripten_wasm_eh, "1.86.0", None),

@bjorn3 bjorn3 May 25, 2026

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I haven't moved this to the list of removed features as it is an internal feature.

View changes since the review

@bjorn3

bjorn3 commented May 25, 2026

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@purplesyringa @hoodmane @curiousdannii @kripken @aheejin (I hope I didn't forget any major stakeholder)

Has it indeed been long enough since switching to wasm exceptions by default that we can safely remove this flag?

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It's fine with me. I won't ever be turning it off again.

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bjorn3 force-pushed the emscripten_always_wasm_eh branch from 5ac842d to 802c141 Compare May 25, 2026 19:21
purplesyringa added a commit to iex-rs/lithium that referenced this pull request May 25, 2026
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Happy to see this finally happen! No concerns on my side.

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I'm now using panic=abort, so I think it doesn't matter for me.

@bjorn3
bjorn3 force-pushed the emscripten_always_wasm_eh branch from 802c141 to be3e3c7 Compare May 26, 2026 10:58
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Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

@bjorn3
bjorn3 force-pushed the emscripten_always_wasm_eh branch from be3e3c7 to 24d9697 Compare May 27, 2026 09:06
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This was necessary when transitioning from JS to wasm exception handling
on Emscripten. Enough time has probably passed that we no longer need to
support JS exception handling on Emscripten. This enables cleaning up a
fair bit of code.
@bjorn3
bjorn3 force-pushed the emscripten_always_wasm_eh branch from 24d9697 to 9b7623a Compare June 2, 2026 17:58
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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

@TaKO8Ki

TaKO8Ki commented Jun 3, 2026

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@bors r+ rollup

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rust-bors Bot commented Jun 3, 2026

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📌 Commit 9b7623a has been approved by TaKO8Ki

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 5. This pull request will be tested once the tree is reopened.

@rust-bors rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 3, 2026
jhpratt added a commit to jhpratt/rust that referenced this pull request Jun 3, 2026
…r=TaKO8Ki

Remove -Zemscripten-wasm-eh

This was necessary when transitioning from JS to wasm exception handling on Emscripten. Enough time has probably passed that we no longer need to support JS exception handling on Emscripten. This enables cleaning up a fair bit of code.

This is the final step of rust-lang#112195.
rust-bors Bot pushed a commit that referenced this pull request Jun 3, 2026
Rollup of 7 pull requests

Successful merges:

 - #155763 (Promotes 5 Thumb-mode bare-metal Arm targets to Tier 2)
 - #156928 (Remove -Zemscripten-wasm-eh)
 - #157236 (Reorganize `tests/ui/issues` [3/N])
 - #157294 (Split coroutine layout computation to its own file)
 - #157328 (windows: Elide division-by-zero checks in Instant::now())
 - #157331 (Rewrite target checking for `#[link]`)
 - #157336 (Enable `clippy::mem_replace_with_default`)
JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Jun 3, 2026
…r=TaKO8Ki

Remove -Zemscripten-wasm-eh

This was necessary when transitioning from JS to wasm exception handling on Emscripten. Enough time has probably passed that we no longer need to support JS exception handling on Emscripten. This enables cleaning up a fair bit of code.

This is the final step of rust-lang#112195.
JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Jun 3, 2026
…r=TaKO8Ki

Remove -Zemscripten-wasm-eh

This was necessary when transitioning from JS to wasm exception handling on Emscripten. Enough time has probably passed that we no longer need to support JS exception handling on Emscripten. This enables cleaning up a fair bit of code.

This is the final step of rust-lang#112195.
rust-bors Bot pushed a commit that referenced this pull request Jun 3, 2026
…uwer

Rollup of 15 pull requests

Successful merges:

 - #155763 (Promotes 5 Thumb-mode bare-metal Arm targets to Tier 2)
 - #156953 (delegation: emit error when there is an infer lifetime in user-specified args)
 - #157248 (delegation: move statements out of the first arg)
 - #157263 (rustc_codegen_ssa: Refactor `ArchiveEntry` to include entry kind)
 - #157311 (Use weak linkage for EII defaults)
 - #156089 (Fix unused_parens for pinned reference patterns)
 - #156928 (Remove -Zemscripten-wasm-eh)
 - #157236 (Reorganize `tests/ui/issues` [3/N])
 - #157287 (Const generics: remove AliasTerm::kind(), and small fixes)
 - #157294 (Split coroutine layout computation to its own file)
 - #157328 (windows: Elide division-by-zero checks in Instant::now())
 - #157331 (Rewrite target checking for `#[link]`)
 - #157336 (Enable `clippy::mem_replace_with_default`)
 - #157362 (Fix trivial wf module argument/doc comment name mismatches)
 - #157364 (Rewrite target checking of `rustc_dummy`)

Failed merges:

 - #157332 (Rewrite target checking for `#[sanitize]`)
@rust-bors
rust-bors Bot merged commit 266eb48 into rust-lang:main Jun 3, 2026
12 checks passed
@rustbot rustbot added this to the 1.98.0 milestone Jun 3, 2026
rust-timer added a commit that referenced this pull request Jun 3, 2026
Rollup merge of #156928 - bjorn3:emscripten_always_wasm_eh, r=TaKO8Ki

Remove -Zemscripten-wasm-eh

This was necessary when transitioning from JS to wasm exception handling on Emscripten. Enough time has probably passed that we no longer need to support JS exception handling on Emscripten. This enables cleaning up a fair bit of code.

This is the final step of #112195.
@bjorn3
bjorn3 deleted the emscripten_always_wasm_eh branch June 3, 2026 16:36
@bjorn3 bjorn3 added the relnotes Marks issues that should be documented in the release notes of the next release. label Jun 18, 2026
@bjorn3

bjorn3 commented Jun 18, 2026

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I think it makes sense to mention this in the relnotes even though it is unstable as it might affect some Emscripten users.

metavacua added a commit to metavacua/larql-to-sparql that referenced this pull request Aug 14, 2026
… under wasmtime

Researched Emscripten's STANDALONE_WASM/PURE_WASI modes against rustc's own
docs and prior art before writing this. Priors point toward 'probably not'
(Emscripten's own maintainer: 'likely not compatible with wasmtime/WASI...
use wasi-sdk, not emscripten' -- no confirmed Rust case found anywhere), but
rust-lang/rust#156928 (merged 2026-06-03) removed the JS-exceptions escape
hatch this target used to need, forcing native wasm-EH unconditionally --
the exact JS dependency that broke every prior known attempt. larql-cli has
no Emscripten C/C++ port dependency forcing the old ABI, making this a
genuinely untested combination worth running for real rather than assuming.
m3rlin45 added a commit to m3rlin45/libxrk that referenced this pull request Aug 16, 2026
All Pyodide wheel builds fail on every branch. Two independent pieces of
upstream drift, plus a matrix setting that hid the second behind the first.

1. pyodide-build was pinned to the Pyodide RUNTIME version
-----------------------------------------------------------
    HTTPError: 404 Client Error: Not Found for url:
    https://raw.githubusercontent.com/pyodide/pyodide/main/pyodide-cross-build-environments.json

The workflow installed `pyodide-build==${{ matrix.pyodide-version }}`, pinning
the build TOOL to the runtime it targets. Those are independent axes.
pyodide-build 0.27.3 and 0.29.3 both hardcode the metadata URL above, which
upstream removed, so `xbuildenv install` died on a 404 before compiling
anything. The justfile's 0.29 recipes had the same pin.

One current pyodide-build serves every runtime; the runtime is selected by the
argument to `xbuildenv install`. Install 0.32.0 (already locked in uv.lock, and
what the 0.27 justfile path has used via `uv run` all along).

Deliberately NOT worked around with PYODIDE_CROSS_BUILD_ENV_METADATA_URL: that
would paper over the dead URL while leaving the tool pinned to a stale release.

Verified locally with pyodide-build 0.32.0:

    xbuildenv install 0.27.3  (Python 3.12) -> ok, emscripten 3.1.58
    xbuildenv install 0.29.3  (Python 3.13) -> ok, emscripten 4.0.9

Both match the emscripten versions pinned in the matrix. The runtime still
dictates the HOST Python — installing the 0.29.x xbuildenv under 3.12 is
refused — which is why the matrix uses 3.13 there and the justfile's 0.29
recipes use pyenv. Unchanged.

2. rustc removed -Zemscripten-wasm-eh
--------------------------------------
    error: unknown unstable option: `emscripten-wasm-eh`

With (1) fixed, the 0.29 build got as far as compiling the Cython extension to
wasm and then died linking the Rust one. rust-lang/rust#156928 ("Remove
-Zemscripten-wasm-eh", merged 2026-06-03) deleted the flag: wasm exception
handling is now unconditional on Emscripten, so opting in is meaningless.

Dropped from the 0.29 matrix entry and the two justfile 0.29 recipes.
Reproduced and verified against nightly-2026-08-15 (rustc 1.99.0-nightly):

    -Zemscripten-wasm-eh                  -> unknown unstable option
    (no flag)                             -> panic="unwind"  (wasm EH default)
    0.27's -C panic=abort opt-out         -> panic="abort"   (still accepted)

The 0.27 entry is left alone: its flags are still valid. Note the upstream PR
says JS exception handling on Emscripten is no longer supported, so the 0.27
path (Emscripten 3.1.58, no __cpp_exception tag) may need its own follow-up if
it fails at link time — it had not reached linking before being cancelled.

3. fail-fast hid the second failure behind the first
-----------------------------------------------------
The matrix defaulted to fail-fast, so when 0.29 failed, 0.27 was cancelled
mid-compile and reported as "fail". That made one broken runtime look like two
and sent the first round of debugging at the wrong job. Set fail-fast: false so
each runtime reports independently.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
m3rlin45 added a commit to m3rlin45/libibt that referenced this pull request Aug 17, 2026
Port libxrk's wasm-to-PyPI release setup (libxrk v0.13.0):

- Repair the Pyodide 0.29 build, broken by two pieces of upstream drift:
  pyodide-build 0.29.3 hardcodes a cross-build-env metadata URL upstream
  removed (404 on xbuildenv install), and rustc removed -Zemscripten-wasm-eh
  (rust-lang/rust#156928; wasm EH is now unconditional on Emscripten).
  Install pyodide-build 0.39.0 (one current build tool serves every runtime)
  and drop the flag, linking through the emcc/wasm-opt shims instead.

- Add a Pyodide 314 (Python 3.14) matrix entry that builds a PEP 783
  pyemscripten_2026_0 wheel on stable Rust with the xbuildenv's rustflags,
  and test both runtimes in CI.

- Publish the PEP 783 wheel to PyPI alongside the CPython wheels and sdist.
  The legacy pyodide_2025_0 wheel predates the PEP, is rejected by PyPI, and
  keeps shipping as a GitHub Release asset only.

- Bump version to 0.0.5 for the release.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
flip1995 pushed a commit to flip1995/rust-clippy that referenced this pull request Aug 17, 2026
…uwer

Rollup of 15 pull requests

Successful merges:

 - rust-lang/rust#155763 (Promotes 5 Thumb-mode bare-metal Arm targets to Tier 2)
 - rust-lang/rust#156953 (delegation: emit error when there is an infer lifetime in user-specified args)
 - rust-lang/rust#157248 (delegation: move statements out of the first arg)
 - rust-lang/rust#157263 (rustc_codegen_ssa: Refactor `ArchiveEntry` to include entry kind)
 - rust-lang/rust#157311 (Use weak linkage for EII defaults)
 - rust-lang/rust#156089 (Fix unused_parens for pinned reference patterns)
 - rust-lang/rust#156928 (Remove -Zemscripten-wasm-eh)
 - rust-lang/rust#157236 (Reorganize `tests/ui/issues` [3/N])
 - rust-lang/rust#157287 (Const generics: remove AliasTerm::kind(), and small fixes)
 - rust-lang/rust#157294 (Split coroutine layout computation to its own file)
 - rust-lang/rust#157328 (windows: Elide division-by-zero checks in Instant::now())
 - rust-lang/rust#157331 (Rewrite target checking for `#[link]`)
 - rust-lang/rust#157336 (Enable `clippy::mem_replace_with_default`)
 - rust-lang/rust#157362 (Fix trivial wf module argument/doc comment name mismatches)
 - rust-lang/rust#157364 (Rewrite target checking of `rustc_dummy`)

Failed merges:

 - rust-lang/rust#157332 (Rewrite target checking for `#[sanitize]`)
tmeijn pushed a commit to tmeijn/dotfiles that referenced this pull request Aug 21, 2026
This MR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [rust](https://github.com/rust-lang/rust) | tools | minor | `1.97.1` → `1.98.0` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

---

### Release Notes

<details>
<summary>rust-lang/rust (rust)</summary>

### [`v1.98.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1980-2026-08-20)

[Compare Source](rust-lang/rust@1.97.1...1.98.0)

\==========================

<a id="1.98.0-Language"></a>

## Language

- [Allow shortening lifetime of `&mut` when unsize-coercing, even in an invariant position.](rust-lang/rust#149219) For example, you can now coerce a `Cell<&'long mut i32>` to a `Cell<&'short mut dyn Send>`. Such shortenings were already previously allowed when coercing a `&mut` to a `&`, or coercing a `&` to a `&`.
- [Add deny-by-default `invalid_runtime_symbol_definitions` lint and warn-by-default `suspicious_runtime_symbol_definitions` lint](rust-lang/rust#155521)
  - The lints currently specifically targets `core` runtime symbols like `memcmp`, `memset`, `strlen`, ... and is planned to be expanded in the next few releases.
- [Add warn-by-default `c_void_returns` lint to check `core::ffi::c_void` as a return type](rust-lang/rust#156379)

<a id="1.98.0-Platform-Support"></a>

## Platform Support

- [Add `powerpc64-unknown-linux-gnuelfv2` as Tier 3](rust-lang/rust#144220)
- [Add `aarch64-unknown-linux-pauthtest` as Tier 3 target](rust-lang/rust#155722)
- [Promote `thumbv7a-none-eabi` to Tier 2](rust-lang/rust#155763)
- [Promote `thumbv7a-none-eabihf` to Tier 2](rust-lang/rust#155763)
- [Promote `thumbv7r-none-eabi` to Tier 2](rust-lang/rust#155763)
- [Promote `thumbv7r-none-eabihf` to Tier 2](rust-lang/rust#155763)
- [Promote `thumbv8r-none-eabihf` to Tier 2](rust-lang/rust#155763)

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

<a id="1.98.0-Libraries"></a>

## Libraries

- [Change `Location<'_>` lifetime to `'static` in `Panic[Hook]Info`](rust-lang/rust#146561)
- [Document panic in `RangeInclusive::from(legacy::RangeInclusive)`](rust-lang/rust#155421)
- [Document that `ManuallyDrop`'s `Box` interaction has been fixed](rust-lang/rust#155750)
- [Stabilize LoongArch CRC Intrinsics](rust-lang/rust#156908)
- [The `derive` macro is available at `{core,std}::derive`.](rust-lang/rust#154645) This was previously [unintentionally stabilized in 1.96](rust-lang/rust#159856), but is now [explicitly accepted](rust-lang/rust#154645) as a stabilized API.
  - Please note that the MSRV for `{core,std}::derive` will be 1.96, and not 1.98.

<a id="1.98.0-Stabilized-APIs"></a>

## Stabilized APIs

- [`str::substr_range`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.substr_range)
- [`[T]::subslice_range`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.subslice_range)
- [`core::fmt::NumBuffer`](https://doc.rust-lang.org/stable/core/fmt/struct.NumBuffer.html)
- [`<{integer}>::format_into`](https://doc.rust-lang.org/stable/core/primitive.usize.html#method.format_into)
- [`Send/Sync for std::process::CommandArgs`](https://doc.rust-lang.org/stable/std/process/struct.CommandArgs.html#impl-Send-for-CommandArgs%3C'a%3E)
- [`{fN}::algebraic_add`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_add)
- [`{fN}::algebraic_sub`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_sub)
- [`{fN}::algebraic_mul`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_mul)
- [`{fN}::algebraic_div`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_div)
- [`{fN}::algebraic_rem`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_rem)
- [`NonZero<{integer}>::from_str_radix`](https://doc.rust-lang.org/stable/core/num/struct.NonZero.html#method.from_str_radix-4)
- [`String::from_utf16le`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le)
- [`String::from_utf16le_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le_lossy)
- [`String::from_utf16be`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be)
- [`String::from_utf16be_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be_lossy)
- [`[T]::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.strip_circumfix)
- [`str::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.str.html#method.strip_circumfix)
- [`Atomic<T>::from_mut`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut)
- [`Atomic<T>::get_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.get_mut_slice)
- [`Atomic<T>::from_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut_slice)
- [`std::range::legacy`](https://doc.rust-lang.org/stable/std/range/legacy/index.html)

<a id="1.98.0-Compatibility-Notes"></a>

## Compatibility Notes

- [If fully elided, lifetime bounds of trait object types may now resolve differently or even get rejected in very specific niche scenarios](rust-lang/rust#129543)
- [Error in more cases of ambiguous imports](rust-lang/rust#145108)
- [Switch the destructors implementation for thread locals on Windows to use Fiber Local Storage (FLS)](rust-lang/rust#148799)
- [Convert some cases of the `ambiguous_glob_imports` lint into a hard error](rust-lang/rust#149195)
- [Where-bounds of the form `Type = Type` and `Type == Type` are no longer syntactically allowed](rust-lang/rust#153513)
- [Ensure Send/Sync is not implemented for std::env::Vars{,Os}](rust-lang/rust#155153)
- [Fix that in some attributes, arguments were not properly rejected](rust-lang/rust#155193)
- [`repr(transparent)` is now more strict about which fields have "trivial" layout and hence can be ignored: `repr(C)` types, types with private fields, and `#[non_exhaustive]` types are no longer considered "trivial"](rust-lang/rust#155299)
- [Correctly check whether types have equal size in `transmute()` when some `repr` attributes are involved.](rust-lang/rust#155418)
- [More characters are escaped when printing strings and chars](rust-lang/rust#155527)
- [Implement fast path for `derive(PartialOrd)` when deriving `Ord`](rust-lang/rust#155598)
  This can break crates in practice where a type's PartialOrd and Ord impls were inconsistent with each other.
- [Add temporary scope to `assert_eq` and `assert_ne`](rust-lang/rust#155739)
- Closed a hole in the pattern matching [structural equality](https://doc.rust-lang.org/reference/patterns.html#constant-patterns) check, preventing cases where a match of a constant would be allowed, despite disagreeing with a manually written `PartialEq` implementation, when a `derive(PartialEq)` implementation for that type also exists.
- [On Emscripten the WASM exception handling ABI is now unconditionally used](rust-lang/rust#156928) The `-Zemscripten-wasm-eh=false` flag to switch back to JS exceptions has been removed.
- [The UNSAFE\_CODE lint is now consistently emitted for all unsafe attributes](rust-lang/rust#157201)
- [Solaris: remove `File::lock` implementation, it has the wrong semantics (return "unsupported" instead)](rust-lang/rust#157509)
- [Windows-gnu targets now specify baseline tools versions](rust-lang/rust#158020)
- [rustfmt now discovers module files that are defined in `cfg_select!`](rust-lang/rust#158372)
  This may cause more code to be formatted which was previously ignored.

</details>

---

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