[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 #10 from Dlang Bot <dlang-bot at dlang.rocks> ---
@RazvanN7 created dlang/dmd pull request #10122 "Fix Issues 19919 and 19917 -
Incorrect initialization of union when first member isn't marked = void" fixing
this issue:

- Fix Issues 19919 and 19917 - Incorrect initialization of union when first
member isn't marked = void

https://github.com/dlang/dmd/pull/10122

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