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Rollup merge of #43045 - PlasmaPower:patch-1, r=Mark-Simulacrum

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README: note how to enable debugging for rustc

I got stuck on this for a bit, looking for a debug option in `./x.py build --help`.

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Before:

> Various other options are also supported, and are documented in the config file.

After:

> Various other options, such as enabling debug information, are also supported, and are documented in the config file.
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Mark Simulacrum 2017-07-04 07:41:45 -06:00 • committed by GitHub
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README.md
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@ -40,8 +40,9 @@ Read ["Installation"] from [The Book].
> ***Note:*** Install locations can be adjusted by copying the config file
> from `./src/bootstrap/config.toml.example` to `./config.toml`, and
> adjusting the `prefix` option under `[install]`. Various other options are
> also supported, and are documented in the config file.
> adjusting the `prefix` option under `[install]`. Various other options, such
> as enabling debug information, are also supported, and are documented in
> the config file.
When complete, `sudo ./x.py install` will place several programs into
`/usr/local/bin`: `rustc`, the Rust compiler, and `rustdoc`, the