Treat irrefutable casts as irrefutable patterns. #9449
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@swift-ci please test |
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Are you planning on getting this into swift-4.0-branch also? |
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Build failed |
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@slavapestov Yes. |
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@swift-ci please smoke test and merge |
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@swift-ci please smoke test |
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⛵️ |
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In response to a post on Swift-dev by @pushkarnk that mentioned a regression in exhaustiveness analysis because irrefutable casts were not treated as irrefutable patterns. This patch does just that.