The CI backend test job failed on HumanLanguageCatalogTests:
nynorsk -> expected "Norwegian", actual "Norwegian Nynorsk"
This was a real bug, correctly caught by the runner -- not runner
instability. Reproduced on Ubuntu 20.04 / libicu66 (the CI runner's ICU)
with .NET 9 installed via dotnet-install.sh exactly as CI does.
Root cause: BuildLanguageLookup's explicit normalization aliases
(nynorsk/bokmål/norsk -> Norwegian) were added with map.TryAdd, which
loses to any key the culture enumeration already inserted. On libicu66
the "nn" culture's NativeName is the bare word "nynorsk", so enumeration
claimed key "nynorsk" -> "Norwegian Nynorsk" first and the explicit alias
silently lost. On libicu70+ (Debian/Ubuntu 22.04+, my earlier local
runs) the native name is "norsk nynorsk", so the key was free and the
alias won -- which is why it passed locally and only failed on the
runner's older ICU. Same host-ICU dependence class as 9681618.
Fix: add an Override helper (map[key] = value) and apply it to the
alias block so these mappings win regardless of insertion order. Also
collapse the full "Norwegian Nynorsk"/"Norwegian Bokmål" phrases to
"Norwegian" for consistency. Correct by construction for any ICU version.
Verified:
- reproduced the exact failure on libicu66 with the old code (probe)
- fix logic yields nynorsk/bokmål -> Norwegian on that same libicu66
- real net9 test DLL: 420/420 on focal libicu66 (CI mirror, dotnet
9.0.316 via dotnet-install.sh), and 420/420 on libicu72 (Debian) and
libicu74 (Ubuntu 24.04), plus locally
No test weakened, skipped, or relaxed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
cesnimda
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