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Sometimes, then I am running meld(); it shows kernel crashed, for example:

{a,b,c,d,e,i,k,m,n,p,q,r,s,t,u,v,w,x,y,z,m#}::Indices(position=independent);
{a,b,c,d,e,i,k,m,n,p,q,r,s,t,u,v,w,x,y,z,m#}::Integer(1..3);

\partial{#}::PartialDerivative.
h_{m? n?}::Metric.
h^{m? n?}::InverseMetric.
h_{m? n?}::Symmetric.
h^{m? n?}::Symmetric.
\delta^{m?}_{n?}::KroneckerDelta.
\delta_{m?}^{n?}::KroneckerDelta.
F_{m? n?}::AntiSymmetric.
\pi::Depends(\partial{#}).
\phi::Depends(\partial{#}).
A_{m?}::Depends(\partial{#}).
h_{m n}::Depends(\partial{#}).
h^{m n}::Depends(\partial{#}).
\psi::Depends(\partial{#}).
\Gamma^{\alpha}_{\mu\nu}::TableauSymmetry(shape={2}, indices={1,2}).
\Gamma^{m}_{n q}::TableauSymmetry(shape={2}, indices={1,2}).
ex := 1/2 h^{a b} F_{n b} \partial_{a}(\pi) \partial_{m}(\psi) (\phi)**2 +  1/2 h^{a b} F_{m b} \partial_{a}(\pi) \partial_{n}(\psi) (\phi)**2-A_{m} \partial_{a}(\phi) \partial_{b}(\pi) \partial_{n}(\psi) \phi h^{a b}-A_{n} \partial_{a}(\phi) \partial_{b}(\pi) \partial_{m}(\psi) \phi h^{a b};

rename_dummies(_);

meld(_);

I'm not sure, but may be it happens only in a case of combination rename_dummies and meld.

asked in General questions by (170 points)

This does not crash for me with the current github master branch. Are you using that version or something earlier?

I'm using cadabra2-2.3.2-ulyana, and I tried this piece of code again, and it crashes when I try to execute the last 3 lines a second time. In a larger program, it usually crashes the first time.
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Ok, I can reproduce this now. WIll have a look.

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