Merge pull request #163 from heuer/better_errormsg #864

Job	Run time
mypy tests	31s
Build Wayland libraries (0.16.2)	1m 12s
black tests	7s
Ruff tests	7s
Build Wayland libraries (master)	1m 57s
Python 3.8 unit tests (0.16.2)	42s
Python 3.9 unit tests (0.16.2)	47s
Python 3.10 unit tests (0.16.2)	41s
Python 3.11 unit tests (0.16.2)	43s
packaging tests	42s
protocol headers test	18s
Python 3.12 unit tests (0.16.2)	37s
Python pypy-3.8 unit tests (0.16.2)	1m 5s
Python pypy-3.9 unit tests (0.16.2)	2m 38s
Python pypy-3.10 unit tests (0.16.2)	1m 4s
Python 3.12 unit tests (master)	32s
	13m 43s

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