https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104242

--- Comment #1 from Fedor Chelnokov <fchelnokov at gmail dot com> ---
The error message is
invalid use of incomplete type 'std::__conditional_t<true,
std::is_copy_constructible<A>, std::__not_<std::integral_constant<bool, false>
> >' {aka 'struct std::is_copy_constructible<A>'}
...

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