Can't compile eigensumsqdyn-notmp.cpp with Eigen 3.4.0

[GregTheMadMonk]

Hello!

I'm trying to get into Enzyme and use it with Eigen (and potentially some other libraries in the future, but that's not important). To understand what's going on, I tried to build https://github.com/EnzymeAD/Enzyme/blob/main/enzyme/test/Integration/ReverseMode/eigensumsqdyn-notmp.cpp myself, but it fails. I discovered that the line that causes the problem is line 43:

Enzyme/enzyme/test/Integration/ReverseMode/eigensumsqdyn-notmp.cpp

Line 43 in 7e3e90f

return (diff*diff).sum();

If I replace diff * diff with just diff here, it works. Storing the result of diff * diff in an intermediate variable doesn't fix the issue.

Did some new releases of Eigen maybe introduce something that Enzyme can't process? Maybe some compile definitions are needed?

P.S. Also, current git version of Eigen doesn't work with Enzyme even on the modified example that works with 3.4.0

Error output for the issue is in the attached text file
enzyme_error.txt