To be clear, that document contains brainstorming by some core Swift team developers. It's neither implemented in Swift nor officially accepted as a guideline for future development.
"The implementations of the thread-safety layer, the thread verifier, and programs that use the three concurrency libraries are available in the concurrency git branch."
stevetrewick|9 years ago
austinz|9 years ago
Not only that, the git feature branch, if it ever existed, doesn't anymore.
stepanhruda|9 years ago