uncaught exception reached top of stack about ldc HOT 4 OPEN

-link-defaultlib-debug links against unoptimized druntime/Phobos with debuginfos; I'd try that as first thing.

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Any tips on how to debug this issue to be able to provide more information or come up with a reduced test case?

If it reproduces, you can use dustmite (you'll have to write a simple script) and then just let the PC do the work for you (walk away from the machine ;)).

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After 16+ hours dustmite finished. Unfortunately the reduced test case is for another exception, but the result is still the same: uncaught exception reached top of stack. It's still quite a large reduced test, which depends on libclang. The problem might be that it goes through a couple of C++ frames. If anyone wants to take a look at this, I've attached the result of dustmite as a zip file [1]. You need to link with libclang and the LLVM libraries. I've linked with the static libraries. Since the upstream releases don't ship with a static version of libclang I've compiled my own available here [2]. It should work to use the dynamic library as well. You need to either manually edit linker_flags.txt or run the configure script. Then to reproduce the actual issue run: dub --verror --config=test-unit.

I'll try to manually reduce it further.

[1] dstep.zip
[2] https://github.com/jacob-carlborg/clang-builder/releases/tag/v15.0.7%2B0.0.2-rc2

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I've managed to reduce it further, but it still depends on libclang.

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