"Internal error" crash in Julia 1.7.0-beta4 when using the Gridap FEM library.

[fverdugo]

We are experiencing a crash in Julia 1.7.0-beta4 with a simple MWE written with code from the Gridap FEM library.

See this issue for full details: gridap/Gridap.jl#657

If you need further help to dig deeper into the issue, just let me know.

Thanks for the help and the amazing Julia lang!

[JeffBezanson]

Bisect picks 3635f04, which doesn't seem to directly make sense. It might be due to forming more union types, leading to more union splitting, eventually triggering this.

[KristofferC]

3635f04 also caused #42007.

[KristofferC]

Fixed by #42347