[Issue 18934] std.concurrency receive throws assertion failure if message is a struct of struct

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https://issues.dlang.org/show_bug.cgi?id=18934

--- Comment #1 from Russel Winder <russel at winder.org.uk> ---
Created attachment 1699
  --> https://issues.dlang.org/attachment.cgi?id=1699&action=edit
Code exhibiting the error

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