File: issue-39559.rs

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trait Dim {
    fn dim() -> usize;
}

enum Dim3 {}

impl Dim for Dim3 {
    fn dim() -> usize {
        3
    }
}

pub struct Vector<T, D: Dim> {
    entries: [T; D::dim()],
    //~^ ERROR generic parameters may not be used
    _dummy: D,
}

fn main() {}