[swift-evolution] [Draft] Adding a Build Configuration Import Test

[Andrey Tarantsov]

Strong +1, very useful.

Perhaps importable instead of canImport? Looks and reads better:

// UXKit at WWDC'16, pretty please!
#if importable(UIKit)
typealias UXColor = UIColor
#elseif importable(Cocoa)
typealias UXColor = NSColor
#else
// meh
#endif

A.