なぜマージ前にこの assert で気づかなかったんだろうというのは気になりますね． https://github.com/swiftlang/swift/blob/e1eb960e7f0df1733e028bb9213b9c0ef9114a49/lib/SILOptimizer/Analysis/RegionAnalysis.cpp#L3277

swift/lib/SILOptimizer/Analysis/RegionAnalysis.cpp at e1eb960e7f0df...

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