World Age Problem Explanation

General Usage
14

A minimal example showing this effect:

foo() = "foo"
function makebar()
	sleep(rand())
	res= (foo(), Base.invokelatest(foo))
	@eval foo() = "bar"
	res
end
fetch.(Threads.@spawn makebar() for i in 1:2)

The standard call to foo() always returns “foo” for both threads, Base.invokelatest(foo) returns “foo” for the thread with the shorter sleep time and “bar” for the other one.

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