Default destructor missing when using define_aggregate

[ilmmatias]

According to [meta.reflection.define.aggregate], a default empty destructor should be provided by define_aggregate on unions containing alternatives with a non-trivial destructor, but that currently doesn't happen.
The same should also happen for alternatives with a non-trivial constructor (a default empty constructor should be given).

Without this, 3.9 A Simple Variant Type doesn't compile when std::string is one of the pack parameters.
See: https://godbolt.org/z/3c1dqe6Ko

[katzdm]

You're right! Thanks for calling this out; I'd forgotten about this behavior.

[BaLiKfromUA]

Just for visibility, I am looking on this issue