fix(build): fix unable to partially compile

lin

2025-04-25 6a7002bcc41716f11f4ca7eb68ebd06c18fdd5e8

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#include "../Eigen/Sparse"
 
using namespace Eigen;
 
void call_ref(Ref<SparseMatrix<float> > a) { }
 
int main()
{
  SparseMatrix<float> a(10,10);
  SparseMatrixBase<SparseMatrix<float> > &ac(a);
#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
  call_ref(ac);
#else
  call_ref(ac.derived());
#endif
}