`SingularException` when dividing `lu` on zero-dimensional matrices of some generic types about julia HOT 4 OPEN

The line causing the exception on the latest master 71f68b4c is as follows:

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@lukas-weber Could you please post the full stacktraces and a copy-pastable code example for the complex Dual case. One possibility is to catch this case earlier at the lu/factorization level, another one is to catch it at the generic triangular solve level. That would be easier to judge given the stacktraces.

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Perhaps it's better to solve it in triangular solve as it will also be solved for the vanilla L \ b when used independently of lu? What I saw at that time was that in the other "graceful" cases, it works because the loop variables are not accessed outside of the loop over their size. But, in this case, amm is accessed before the loop over m, perhaps for efficiency reasons.

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@lukas-weber Could you please post the full stacktraces and a copy-pastable code example for the complex Dual case. One possibility is to catch this case earlier at the lu/factorization level, another one is to catch it at the generic triangular solve level. That would be easier to judge given the stacktraces.

They are added now. Sorry for the inconvenience!

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