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A `#[marker]` trait contained an associated item.
Erroneous code example:
```compile_fail,E0714
#![feature(marker_trait_attr)]
#![feature(associated_type_defaults)]
#[marker]
trait MarkerConst {
const N: usize; // error!
}
fn main() {}
```
The items of marker traits cannot be overridden, so there's no need to have them
when they cannot be changed per-type anyway. If you wanted them for ergonomic
reasons, consider making an extension trait instead.
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