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The `optimize` attribute was malformed.
Erroneous code example:
```compile_fail,E0722
#![feature(optimize_attribute)]
#[optimize(something)] // error: invalid argument
pub fn something() {}
```
The `#[optimize]` attribute should be used as follows:
- `#[optimize(size)]` -- instructs the optimization pipeline to generate code
that's smaller rather than faster
- `#[optimize(speed)]` -- instructs the optimization pipeline to generate code
that's faster rather than smaller
For example:
```
#![feature(optimize_attribute)]
#[optimize(size)]
pub fn something() {}
```
See [RFC 2412] for more details.
[RFC 2412]: https://rust-lang.github.io/rfcs/2412-optimize-attr.html
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