Use #if canImport
implemented in Swift 4.1 (SE-0075)
#636
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https://github.com/apple/swift-evolution/blob/master/proposals/0075-import-test.md
There should be no behavioral change, just replacing
#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
with#if canImport(Darwin)
.See also Quick/Quick#832.