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The `plugin` attribute was malformed.
Erroneous code example:
```compile_fail,E0498
#![feature(plugin)]
#![plugin(foo(args))] // error: invalid argument
#![plugin(bar="test")] // error: invalid argument
```
The `#[plugin]` attribute should take a single argument: the name of the plugin.
For example, for the plugin `foo`:
```ignore (requires external plugin crate)
#![feature(plugin)]
#![plugin(foo)] // ok!
```
See the [`plugin` feature] section of the Unstable book for more details.
[`plugin` feature]: https://doc.rust-lang.org/nightly/unstable-book/language-features/plugin.html
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