Created
June 21, 2019 03:13
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| extension Optional { | |
| public mutating func ensure(_ f: () throws -> Wrapped) rethrows -> Wrapped { | |
| if let x = self { | |
| return x | |
| } | |
| let x = try f() | |
| self = x | |
| return x | |
| } | |
| } |
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