[eigen] leftCol(0)

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Hi everyone.
I was trying some code while writing the Block operations tutorial and found that the output of the following program does not make much sense:

#include <Eigen/Dense>
#include <iostream>
using namespace Eigen;
int main()
   Matrix<float,3,3> m;
m << 1,2,3,
std::cout << m.leftCols(0) << std::endl;
    return 0;

I wonder if this is a desired behaviour. I was expecting to get a compile-time error, or at least a run-time one.


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