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In the matrix-vector products, we were calling coeffRef on the vector xpr without checking it has DirectAccess. Will add unit test (since it's in 2.0, just import the test case provided in the bug report). Confirming that this can't happen in the devel branch, and that if we tried to call coeffRef on an xpr without DirectAccess, that would not compile (since the DenseCoeffsBase class was introduced).