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Jun 29, 2025
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Add temporary broken ./x test library/std advisory #2482

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18 changes: 18 additions & 0 deletions src/building/how-to-build-and-run.md
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<!-- toc -->

<div class="warning">

For `profile = "library"` users, or users who use `download-rustc = true | "if-unchanged"`, please be advised that
the `./x test library/std` flow where `download-rustc` is active (i.e. no compiler changes) is currently broken.
This is tracked in <https://github.com/rust-lang/rust/issues/142505>. Only the `./x test` flow is affected in this
case, `./x {check,build} library/std` should still work.

In the short-term, you may need to disable `download-rustc` for `./x test library/std`. This can be done either by:

1. `./x test library/std --set rust.download-rustc=false`
2. Or set `rust.download-rustc=false` in `bootstrap.toml`.

Unfortunately that will require building the stage 1 compiler. The bootstrap team is working on this, but
implementing a maintainable fix is taking some time.

</div>


The compiler is built using a tool called `x.py`. You will need to
have Python installed to run it.

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