[eigen] Using transpose in expressions |

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`Why does the following program work when ERROR_CASE is zero and
``generates a compile error when ERROR_CASE is one
`(I am using eigen-3.2.7).
# include <iostream>
# include <Eigen/Core>
# define ERROR_CASE 1
int main(void)
{ typedef Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic> matrix;
//
matrix A = matrix::Identity(2, 2);
# if ERROR_CASE
matrix C = A * (A * A).transpose();
# else
matrix C = A * A * A.transpose();
# endif
//
std::cout << "C = \n" << C << "\n";
}