[Issue 11864] std.variant.Variant doesn't work with CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=11864

--- Comment #3 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Default struct value doesn't run code at runtime and there are no plans for it.
You can disable default struct constructor to make non-default constructor
mandatory, `S()` form is fine too if you declare static opCall.

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