[Issue 19917] unions should require that all members are `= void` initialised

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19917

--- Comment #12 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/dmd pull request #12899 "End deprecation period for incorrect
initialization of union when first member isn't marked (Issues 19919 and
19917)" was merged into master:

- 5600f50c129c45d7867238a0488fc49f8aa167cd by Iain Buclaw:
  End deprecation period for incorrect initialization of union when first
member isn't marked (Issues 19919 and 19917)

https://github.com/dlang/dmd/pull/12899

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