Multithreading mystery

General Usage
2

In Julia 1.4 you can use $ to copy the current value of x into the macro. I think you see this behavior because the outer while loop has already finish before the thread from Threads.@spawn starts. By than x=3 and gets printed.

function f()
   x = 0
   @sync while x < 3
      Threads.@spawn println($x)
      x += 1
   end
end
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