[swift-evolution] 3.0 if-var workaround construction question

[Erica Sadun]

My new linter picked up the following as a problem for Swift 3.0, because of my interpretation of the rules in  https://github.com/apple/swift-evolution/blob/master/proposals/0003-remove-var-parameters-patterns.md <https://github.com/apple/swift-evolution/blob/master/proposals/0003-remove-var-parameters-patterns.md>

    if var testStream = OutputStream(path: aPath) {
        print("Testing custom output", toStream: &testStream)
        print("Hello ", terminator: "", toStream: &testStream)
        print("World", toStream: &testStream)
        print("Output sent to \(testStream.path)")
    } else {
        print("Failed to create custom output")
    }

Am I right in assuming this construction will not compile in Swift 3.0? And if so, how should I best recommend re-configuration. I assume the preferred route would be either:

    if let outputStream = OutputStream(path: aPath) {
        var testStream = outputStream
        print("Testing custom output", toStream: &testStream)
        print("Hello ", terminator: "", toStream: &testStream)
        print("World", toStream: &testStream)
        print("Output sent to \(testStream.path)")
    } else {
        print("Failed to create custom output")
    }

Or using shadowing to mimics the "if let x = x" pattern that has become conventional:

    if let outputStream = OutputStream(path: aPath) {
        var outputStream = outputStream
        print("Testing custom output", toStream: &outputStream)
        print("Hello ", terminator: "", toStream: &outputStream)
        print("World", toStream: &outputStream)
        print("Output sent to \(outputStream.path)")
    } else {
        print("Failed to create custom output")
    }

Thanks in advance for insight.

-- E

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