[Issue 14953] std.concurrency: Add function to flush message box

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14953

--- Comment #6 from Chris <wendlec at tcd.ie> ---
You assume a scenario where the programmer has no control over the data flow
and messages can come from anywhere in at random, which is not necessarily the
case. If threads follow a message passing protocol there is naturally some sort
of synchronization between the threads.

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