[Issue 18216] struct no size because of forward reference

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18216

--- Comment #2 from Dlang Bot <dlang-bot at dlang.rocks> ---
@RazvanN7 created dlang/dmd pull request #14012 "Add test for Issue 18216"
mentioning this issue:

- Add test for Issue 18216

https://github.com/dlang/dmd/pull/14012

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