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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/96645] [9/10/11 Regression] std::variant default constructor
Date: Mon, 15 Feb 2021 15:28:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96645

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #7 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> It looks like the nested class DataWithStruct::A isn't considered complete
> until after DataWithStruct is complete, but I'm not sure why that is.

Maybe the note in [class.mem.general]/7 is relevant:

  A complete-class context of a nested class is also a complete-class conte=
xt
of any enclosing class, if the nested class is defined within the
member-specification of the enclosing class.

We can't determine if A is constructible until we parse the initializer for
DataWithStruct::A::number.  And according to the above, we can't parse this
initializer until DataWithStruct is complete.

Looks like PR81359 is closely related.=