[Issue 15842] struct is being copied when returned directly

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15842

--- Comment #4 from Atila Neves <atila.neves at gmail.com> ---
I'd only close the bug if there's a test in the testsuite that would fail if
the current behaviour ever changes.

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