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Function std.parallelism.Task.spinForce
If the Task
isn't started yet, execute it in the current thread.
If it's done, return its return value, if any. If it's in progress,
busy spin until it's done, then return the return value. If it threw
an exception, rethrow that exception.
This function should be used when you expect the result of the
Task
to be available on a timescale shorter than that of an OS
context switch.
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