Treating NaN as error: Helping debugging

[simeonschaub]

You might be interested in this old post:

NaN Detector

I have a half-completed attempt at using a Cassette pass to find the first NaN that gets returned from any function. Needs some more work, but it found the NaN I was hunting for and then I moved on: https://github.com/mbauman/TheNaNTrap.jl/