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Add alternative for how to install if rustup fails

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As is the case now: https://rust-lang-nursery.github.io/rust-toolstate/
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Timo 2019-03-30 17:53:15 -04:00 • committed by GitHub
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README.md
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@ -88,9 +88,19 @@ fn does_not_work_on_miri() {
### Common Problems
When using the above instructions, you may encounter a number of confusing compiler
When using the above instructions, you may encounter a number of confusing
errors.
#### "component 'miri' for target '\<target\>' is unavailable for download for channel 'nightly'"
The latest nightly may have broken Miri. If [this is the case][rust-toolstate], instead try to install Miri the old way with
```sh
cargo +nightly install --force --git https://github.com/rust-lang/miri miri
```
[rust-toolstate]:
#### "found possibly newer version of crate `std` which `<dependency>` depends on"
Your build directory may contain artifacts from an earlier build that have/have