### ROOT CAUSE
The issue arises from an incorrect syntax in the `reuse` statement where `Trait::<>` is used instead of properly referencing the associated function `Trait::bar4()`. This leads to a compiler panic due to a miscompiled function delegation.
### CODE FIX
Replace `Trait::<>` with `Trait::bar4()` in the `reuse` statement to correctly reference the associated function.
```rust
#![feature(fn_delegation)]
trait Trait {
fn bar4();
}
impl Trait for () {
reuse Trait::bar4() as bar4;
}
```
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