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When I use 'sort_product' in the following code

{\mu,\nu,\rho,sigma}::Indices(vector).
a^{\mu}::SelfNonCommuting.
{a^{\mu},b^{\mu}}::NonCommuting.
\nabla{#}::Derivative.
tr{#}::Trace.
ex:=tr{a^{\mu}\nabla^{\nu}{a^{\mu}}b^{\nu}\nabla^{\rho}{a^{\rho}}};
sort_product(_);
sort_product(_);

I find that cadabra don't know where to stop. This bug is similar to this and this.

asked in Bug reports by (770 points)

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