Folks, while I would love to have #available as an expression I don't think it's really technically feasible to do so. This would likely require refactoring the entire symbol availability system, has many edge cases and doesn't really solve many problems. I would rather not diverge from the original proposal which just includes the ability to negate the current check, which is clearly an oversight in the compiler given that you can do so just fine in Obj-C.
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