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An unstable feature was used.
Erroneous code example:
```compile_fail,E0658
#[repr(u128)] // error: use of unstable library feature 'repr128'
enum Foo {
Bar(u64),
}
```
If you're using a stable or a beta version of rustc, you won't be able to use
any unstable features. In order to do so, please switch to a nightly version of
rustc (by using [rustup]).
If you're using a nightly version of rustc, just add the corresponding feature
to be able to use it:
```
#![feature(repr128)]
#[repr(u128)] // ok!
enum Foo {
Bar(u64),
}
```
[rustup]: https://rust-lang.github.io/rustup/concepts/channels.html
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