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omochimetaru 4/25/2019 7:40 AM
@swift-5.1.5 swiftc -emit-sil -O func main() -> Int { let hoge: Int? = 1 let fuga = hoge .map { $0 * 2 } .map { $0 + 3 } .map { $0 * 4 } return fuga ?? 99 } main() (edited)