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