https://issues.dlang.org/show_bug.cgi?id=14232
--- Comment #13 from Martin Nowak <c...@dawg.eu> --- Thanks @dicebot. It's this error you're triggering. https://github.com/9rnsr/dmd/commit/1b932b9282df6ed312b6da0031417ea0d4f8faa5#diff-62dcb5f0ffc3089b7565897d8beb3322R918 At best you pass a `bool onlyWarn = false` to `appendStorageClass`, and then pass `true` for places were it didn't previously error. The actual error was introduced here. https://github.com/D-Programming-Language/dmd/pull/3689 Be careful to preserve existing errors. https://github.com/9rnsr/dmd/commit/1b932b9282df6ed312b6da0031417ea0d4f8faa5#diff-62dcb5f0ffc3089b7565897d8beb3322R503 --