Bug 451427

Created attachment 147459 [details]
output of terminal while the crash happened

SUMMARY
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Umbrello crashes whenever I try to import a file containing c++ variadic template 
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STEPS TO REPRODUCE
1.  create a c++20 file containing variadic template (or clone the project I detected it on: git@gitlab/azkalaak/my_rpg_reloaded.git
2. open umbrello, and open the code import wizard
3. try to import the file containing the c++ variadic templated class (on my project, just import the ZenithException class is in the folder libs/zenith)
4. see the crash happen

OBSERVED RESULT
Umbrello crashes with the messages linked with this report


EXPECTED RESULT
Umbrello succesfully imports the classes


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 35 / Kde plasma 5.24.2
(available in About System)
KDE Plasma Version:  5.24.2
KDE Frameworks Version: 5.91.0 
Qt Version: 5.15.2

ADDITIONAL INFORMATION
I am using some c++20 features (templates, include)
I am using KDE wayland as it is the default KDE on fedora. I did not test this on Xorg KDE (but I can if requested)