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AsserstionFailure
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| /* syntax: | |
| public func assertionFailure( | |
| _ message: @autoclosure () -> String = default, | |
| file: StaticString = #file, | |
| line: UInt = #line) | |
| */ | |
| guard age >= 3 else { | |
| return assertionFailure("Age can't be less than 3") | |
| } |
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