dist-i686-msvc hang on lint-docs

[JonathanBrouwer]

On dist-i686-mscv, lint-docs consistently hangs in CI.
Example run: #158342 (comment)

In this try build I added some extra logging: #158363 (comment)
The last thing this prints is:

  [lint-docs] Generating output for missing_debug_implementations
  compiling lint missing_debug_implementations
  running: "D:\\a\\rust\\rust\\build\\i686-pc-windows-msvc\\stage1\\bin\\rustc.exe" "--edition=2024" "-Zunstable-options" "--error-format=json" "--target" "i686-pc-windows-msvc" "lint_example.rs"
  #![deny(missing_debug_implementations)]
  pub struct Foo;
  fn main() {}

I've ran this multiple times and it always gets stuck on this point

Zulip thread: #t-infra > dist-i686-msvc hang @ 💬

[jhpratt]

For others not involved in this, this will be temporarily worked around by #158379. It is not a long-term fix as it disables part of CI.

[ChrisDenton]

I've not yet been able to reproduce this locally. It might be more productive to use CI to debug this, which is admittedly more difficult.