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• SR-2153 Deprecation warning despite #available check

Issue Description:

The current interpretation of * in @available is counter-intuitive and differs from its interpretation in #available.

Here is an example:

@available(OSX, deprecated=10.10)
@available(*, deprecated)
func foo() { }

Right now the compiler treats this as "foo() is deprecated on all versions of all platforms" – that is, the * wins over the OSX.

In my opinion a more natural interpretation of the above is: "foo() was deprecated on OSX in version 10.10 and is deprecated for all versions on all other platforms." It appears the authors of the Dispatch overlay thought similarly, because they used the above annotations thinking it had this second meaning (see https://bugs.swift.org/browse/SR-2153).