Fixed_slice: DimName not implemented?

Am I missing something obvious? I cannot get any of the fixed_* methods to work.

let a = Matrix3::<f32>::zeros();
let s = a.fixed_slice::<U2, U2>(0, 0);

trait na::DimName is not implemented for typenum::uint::UTerm

Are you using U2 from typenum? You need to use the type-level integers from nalgebra instead (nalgebra::U2).

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