Michel Schanen

I didn't have enough bandwidth. Closing as unfinished or not started.

Mmh, you are right. I missed the wait when creating that MWE. Now I'm not sure what happened. This code works now. Thanks! I updated the code above. Is that...

I compiled graphviz with a custom value of `YY_BUF_SIZE` in `scan.l` and `scan.c`. I used actually the value that is commented out there, so I assume others ran into this...

@j-fu Would it help you if you had rules for ChainRules.jl such that one would not have to go through the linear solver with Dual numbers but solve the tangent...

@j-fu It We decided to create a new package [DiffKrylov.jl](https://github.com/JuliaSmoothOptimizers/DiffKrylov.jl) to make Krylov.jl differentiable. Here is a snippet though that makes your example work (bugs maybe included). ```julia using Krylov...

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