Bug 1111: fix infinite recursion in sparse-column-major.row(i).nonZeros() (it now produces a compilation error)
Bug 1111: fix infinite recursion in sparse-column-major.row(i).nonZeros() (it now produces a compilation error)

--HG--
branch : 3.2

robustrobotics/eigen,robustrobotics/eigen,robustrobotics/eigen,robustrobotics/eigen