File: issue-16562.rs

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rustc 1.85.0%2Bdfsg3-1
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trait MatrixShape {}

struct Col<D, C> {
    data: D,
    col: C,
}

trait Collection { fn len(&self) -> usize; }

impl<T, M: MatrixShape> Collection for Col<M, usize> {
//~^ ERROR type parameter `T` is not constrained
    fn len(&self) -> usize {
        unimplemented!()
    }
}

fn main() {}