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Sep 22, 2025
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reduce overlong lines #2596

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11 changes: 8 additions & 3 deletions src/building/bootstrapping/writing-tools-in-bootstrap.md
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Expand Up @@ -19,11 +19,16 @@ There are three types of tools you can write in bootstrap:

Use this for tools that use the `rustc_private` mechanism,
and thus depend on the locally built `rustc` and its rlib artifacts.
This is more complex than the other modes because the tool must be built with the same compiler used for `rustc` and placed in the "stageN-tools" directory.
When you choose `Mode::ToolRustcPrivate`, `ToolBuild` implementation takes care of this automatically.
This is more complex than the other modes,
because the tool must be built with the same compiler used for `rustc`,
and placed in the "stageN-tools" directory.
When you choose `Mode::ToolRustcPrivate`,
`ToolBuild` implementation takes care of this automatically.
If you need to use the builder’s compiler for something specific,
you can get it from `ToolBuildResult`, which is returned by the tool's [`Step`].

Regardless of the tool type you must return `ToolBuildResult` from the tool’s [`Step`] implementation and use `ToolBuild` inside it.
Regardless of the tool type,
you must return `ToolBuildResult` from the tool’s [`Step`] implementation,
and use `ToolBuild` inside it.

[`Step`]: https://doc.rust-lang.org/nightly/nightly-rustc/bootstrap/core/builder/trait.Step.html