Hi,

It seems that the algorithm `eliminate_kronecker(_);`

crashes when acting on double derivatives. (I'm running Cadabra on Mac OS High Sierra v 10.13.6. )

For example, the following program does not compile:

`{A,B,C,D,E,F,G,I,K,L,M,N,Q,R,S,T,U#}::Indices(double, position=fixed);`

`\partial{#}::PartialDerivative;`

`g_{A B}::KroneckerDelta;`

`Exp:= g_{A B}*\partial_{A B}{d};`

`eliminate_kronecker(_);`

Thank you for any help!