[swift-evolution] [Proposal] Swift 2.2: #if swift language version

[Drew Crawford]

> If we are going to support something like this, I’d rather see it be something everyone could leverage as there are many use cases for this feature:
> 
> #if available("package-name", "1.2.*")
> #endif

Big +1.

I've asked specifically to get some kind of conditional compilation on corelibs-foundation <https://lists.swift.org/pipermail/swift-corelibs-dev/Week-of-Mon-20151228/000287.html> being used.  corelibs-founcation is currently incompatible with Darwin Foundation, and so it is impractical to make a single codebase build for both.

But building the same application against both Foundations and spotting differences is one of the important ways we're going to spot bugs.

So I think the code quality of Foundation ultimately hinges on getting some feature like this in the language.
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