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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102199] is_default_constructible incorrect for an inner
 type with NSDMI
Date: Wed, 08 Sep 2021 10:13:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102199

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Because a user-provided inner() means it's default constructible, period. If
that default constructor happens to be ill-formed, that's your problem and =
is
outside the immediate context that is checked by is_default_constructible.

Without that user-provided constructor, the compiler has to try to implicit=
ly
define a default constructor, which has to consider all the members and the=
ir
default member initializers, which requires the type to be complete.=