Issue: dev-ada/langkit-23.0.0-r1 fails tests.
Discovered on: amd64 (internal ref: ci)
Created attachment 854668 [details]
build log and emerge --info
Error(s) that match a know pattern in addition to what has been reported in the summary:
subprocess.CalledProcessError: Command '['mypy']' returned non-zero exit status 1.
langkit/gdb/printers.py:42: error: Item "None" of "Optional[List[SubPrettyPrinter]]" has no attribute "append" [union-attr]