Add check if span is from macro expansion

[Kivooeo]

The same thing I did in #147416, actually the same bug but in another place, I'm not really sure how this method is good for fixing such ICEs, but, it does work and not conflicting with any existing tests, so I guess, it's fine

Fixes #147408

r? compiler

[chenyukang]

Thanks!
@bors r=chenyukang

[bors]

📌 Commit e1b361c has been approved by chenyukang

It is now in the queue for this repository.

[matthiaskrgr]

@bors r-
#147684 (comment)

[Kivooeo]

Ngl I have no even close idea on why this could fail, like, is aarch64-pc-windows-msvc anyhow special from other targets? Or where specific I should take a look to understand reason of it

[Kivooeo]

@chenyukang could you take a look at this comment above, it's very confusingggg

[chenyukang]

I think this is caused by the diff in stderr:

-  WARN rustc_errors::emitter Invalid span $SRC_DIR/std/src/macros.rs:LL:COL (#11), error=SourceNotAvailable { filename: Real(Remapped { local_path: None, virtual_name: "$SRC_DIR/std/src/macros.rs" }) }
+  WARN rustc_errors::emitter Invalid span $SRC_DIR/std/src/macros.rs:LL:COL (#11), error=SourceNotAvailable { filename: Real(Remapped { local_path: None, virtual_name: "/rustc/FAKE_PREFIX/library/std/src/macros.rs" }) }

seems there is a difference in Windows.

To ignore them, maybe you can have a try with https://rustc-dev-guide.rust-lang.org/tests/ui.html#normalization

then retry it with:

@bors try jobs=aarch64-msvc-1

[chenyukang]

if that does not help, you may ask for help at:#t-compiler/help. 👉

[Kivooeo]

I already asked in zulip even before this message https://rust-lang.zulipchat.com/#narrow/channel/122651-general/topic/Windows.20path.20normalization.20in.20tests/with/545323081, but unfortunately no answers

Could you do bors try just to make sure this isn't one-time random bug

[chenyukang]

@bors try jobs=aarch64-msvc-1

[rust-log-analyzer]

The job aarch64-msvc-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- [ui] tests\ui\macros\macro-expansion-empty-span-147408.rs stdout ----
Saved the actual stderr to `C:\a\rust\rust\build\aarch64-pc-windows-msvc\test\ui\macros\macro-expansion-empty-span-147408\macro-expansion-empty-span-147408.stderr`
diff of stderr:

-  WARN rustc_errors::emitter Invalid span $SRC_DIR/std/src/macros.rs:LL:COL (#11), error=SourceNotAvailable { filename: Real(Remapped { local_path: None, virtual_name: "$SRC_DIR/std/src/macros.rs" }) }
+  WARN rustc_errors::emitter Invalid span $SRC_DIR/std/src/macros.rs:LL:COL (#11), error=SourceNotAvailable { filename: Real(Remapped { local_path: None, virtual_name: "/rustc/FAKE_PREFIX/library/std/src/macros.rs" }) }
2 warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
3   --> $DIR/macro-expansion-empty-span-147408.rs:18:27
4    |

Note: some mismatched output was normalized before being compared
-  WARN rustc_errors::emitter Invalid span /rustc/FAKE_PREFIX\library\std\src\macros.rs:376:10: 376:10 (#11), error=SourceNotAvailable { filename: Real(Remapped { local_path: None, virtual_name: "/rustc/FAKE_PREFIX\\library\\std\\src\\macros.rs" }) }
+  WARN rustc_errors::emitter Invalid span $SRC_DIR/std/src/macros.rs:LL:COL (#11), error=SourceNotAvailable { filename: Real(Remapped { local_path: None, virtual_name: "/rustc/FAKE_PREFIX/library/std/src/macros.rs" }) }


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args macros\macro-expansion-empty-span-147408.rs`

error: 1 errors occurred comparing output.
status: exit code: 0
command: PATH="C:\a\rust\rust\build\aarch64-pc-windows-msvc\stage2\bin;C:\Program Files (x86)\Windows Kits\10\bin\arm64;C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\arm64;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\bin\HostARM64\arm64;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\bin\HostARM64\arm64;C:\a\rust\rust\build\aarch64-pc-windows-msvc\bootstrap-tools\aarch64-pc-windows-msvc\release\deps;C:\Program Files\Git\clangarm64\bin;C:\Program Files\Git\usr\bin;C:\Users\runneradmin\bin;C:\a\rust\rust\ninja;C:\a\rust\rust\citools\clang-rust\bin;C:\a\rust\rust\sccache;C:\aliyun-cli;C:\vcpkg;C:\Program Files (x86)\NSIS;C:\Program Files\Mercurial;C:\hostedtoolcache\windows\stack\3.7.1\x64;C:\mingw64\bin;C:\Program Files\dotnet;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Program Files (x86)\R\R-4.4.2\bin\x64;C:\SeleniumWebDrivers\GeckoDriver;C:\SeleniumWebDrivers\EdgeDriver;C:\SeleniumWebDrivers\ChromeDriver;C:\Program Files (x86)\sbt\bin;C:\Program Files (x86)\GitHub CLI;C:\Program Files\Git\usr\bin;C:\Program Files (x86)\pipx_bin;C:\npm\prefix;C:\hostedtoolcache\windows\go\1.24.5\arm64\bin;C:\hostedtoolcache\windows\Python\3.12.10\arm64\Scripts;C:\hostedtoolcache\windows\Python\3.12.10\arm64;C:\hostedtoolcache\windows\Ruby\3.3.8\x64\bin;C:\Program Files\OpenSSL\bin;C:\tools\kotlinc\bin;C:\hostedtoolcache\windows\Java_Temurin-Hotspot_jdk\21.0.8-9.0\aarch64\bin;C:\Program Files (x86)\ImageMagick-7.1.2-Q16-HDRI;C:\Program Files\Microsoft SDKs\Azure\CLI2\wbin;C:\ProgramData\kind;C:\ProgramData\Chocolatey\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Program Files\PowerShell\7;C:\Program Files\Microsoft\Web Platform Installer;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn;C:\Program Files\Microsoft SQL Server\150\Tools\Binn;C:\Program Files\dotnet;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files\Microsoft SQL Server\130\DTS\Binn;C:\Program Files\Microsoft SQL Server\140\DTS\Binn;C:\Program Files\Microsoft SQL Server\150\DTS\Binn;C:\Program Files\Microsoft SQL Server\160\DTS\Binn;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\ProgramData\chocolatey\lib\pulumi\tools\Pulumi\bin;C:\Program Files\CMake\bin;C:\Tools\Ninja;C:\ProgramData\chocolatey\lib\maven\apache-maven-3.9.11\bin;C:\Program Files\LLVM\bin;C:\Program Files\nodejs;C:\Program Files\Git\cmd;C:\Program Files\Git\clangarm64\bin;C:\Program Files\Git\usr\bin;C:\Program Files\GitHub CLI;C:\tools\php;C:\Program Files (x86)\sbt\bin;C:\Program Files\Amazon\AWSCLIV2;C:\Program Files\Amazon\SessionManagerPlugin\bin;C:\Program Files\Amazon\AWSSAMCLI\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn;C:\Users\runneradmin\.dotnet\tools;C:\Users\runneradmin\.cargo\bin;C:\Users\runneradmin\AppData\Local\Microsoft\WindowsApps" "C:\\a\\rust\\rust\\build\\aarch64-pc-windows-msvc\\stage2\\bin\\rustc.exe" "C:\\a\\rust\\rust\\tests\\ui\\macros\\macro-expansion-empty-span-147408.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=C:\\Users\\runneradmin\\.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=C:\\a\\rust\\rust\\vendor" "--sysroot" "C:\\a\\rust\\rust\\build\\aarch64-pc-windows-msvc\\stage2" "--target=aarch64-pc-windows-msvc" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "C:\\a\\rust\\rust\\build\\aarch64-pc-windows-msvc\\test\\ui\\macros\\macro-expansion-empty-span-147408" "-A" "unused" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=C:\\a\\rust\\rust\\build\\aarch64-pc-windows-msvc\\native\\rust-test-helpers"
stdout: none
--- stderr -------------------------------
 WARN rustc_errors::emitter Invalid span /rustc/FAKE_PREFIX\library\std\src\macros.rs:376:10: 376:10 (#11), error=SourceNotAvailable { filename: Real(Remapped { local_path: None, virtual_name: "/rustc/FAKE_PREFIX\\library\\std\\src\\macros.rs" }) }
warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
##[warning]  --> C:\a\rust\rust\tests\ui\macros\macro-expansion-empty-span-147408.rs:18:27
   |
LL |     for _ in dbg!([1, 2]).into_iter() {} //~ WARN this method call resolves to
   |                           ^^^^^^^^^
   |
   = warning: this changes meaning in Rust 2021
   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
   = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
   |
LL -     for _ in dbg!([1, 2]).into_iter() {} //~ WARN this method call resolves to
LL +     for _ in dbg!([1, 2]).iter() {} //~ WARN this method call resolves to
   |

warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
##[warning]  --> C:\a\rust\rust\tests\ui\macros\macro-expansion-empty-span-147408.rs:9:16
   |
LL |             $e.into_iter() //~ WARN this method call resolves to
   |                ^^^^^^^^^
...
LL |     for _ in mac!(into_iter [1, 2]) {}
   |              ---------------------- in this macro invocation
   |
   = warning: this changes meaning in Rust 2021
   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
   = note: this warning originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
   |
LL -             $e.into_iter() //~ WARN this method call resolves to
LL +             $e.iter() //~ WARN this method call resolves to
   |
help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
   |
LL |             IntoIterator::into_iter($e.into_iter()) //~ WARN this method call resolves to
   |             ++++++++++++++++++++++++              +

warning: for loop over an `Option`. This is more readably written as an `if let` statement
##[warning]  --> C:\a\rust\rust\tests\ui\macros\macro-expansion-empty-span-147408.rs:22:14
   |
LL |     for _ in mac!(next [1, 2]) {} //~ WARN for loop over an
   |              ^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(for_loops_over_fallibles)]` on by default
help: to iterate over `$e.iter()` remove the call to `next`
   |
LL -             $e.iter().next()
LL +             .by_ref().next()
   |
help: consider using `if let` to clear intent
   |
LL -     for _ in mac!(next [1, 2]) {} //~ WARN for loop over an
LL +     if let Some(_) = mac!(next [1, 2]) {} //~ WARN for loop over an
   |

warning: 3 warnings emitted
------------------------------------------

---

Some tests failed in compiletest suite=ui mode=ui host=aarch64-pc-windows-msvc target=aarch64-pc-windows-msvc
Bootstrap failed while executing `test --stage 2 --skip=compiler --skip=src`
Build completed unsuccessfully in 1:13:09
make: *** [Makefile:112: ci-msvc-py] Error 1
  local time: Sat Oct 18 06:03:47 CUT 2025
  network time: Sat, 18 Oct 2025 06:03:47 GMT
##[error]Process completed with exit code 2.
##[group]Run echo "disk usage:"
echo "disk usage:"

[rust-bors]

💔 Test for 9e2138d failed: CI. Failed jobs:

• try - aarch64-msvc-1 (web logs, extended logs)