[swift-evolution] [Proposal] Shadowing imported functions

[Антон Жилин]

As promised, I've created a proposal to add @shadowing attribute. Link to
the proposal:

https://github.com/Anton3/swift-evolution/blob/shadowing-imported-functions/proposals/NNNN-shadowing-imported-functions.md

Example:

// Imported function (implicit declaration)func dispatch_sync(queue:
dispatch_queue_t, block: (@convention(block) () -> Void)!)
@shadowing(dispatch_sync(queue, block))func sync(queue:
dispatch_queue_t, @noescape block: @convention(block) () -> Void)


- Anton
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