[Issue 12901] `in`/`out` contracts on struct constructor must require function body

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12901

hsteoh at quickfur.ath.cx changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
                 CC|                            |hsteoh at quickfur.ath.cx
         Resolution|FIXED                       |---

--- Comment #3 from hsteoh at quickfur.ath.cx ---
Broken by https://github.com/dlang/dmd/pull/7527

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