[Bug libstdc++/94033] [10 Regression] is_trivially_copy_constructible<> fails with compiler error on complicated object with private default constructor

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94033

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
5c7938eb3f1a116b1cf9a28090f2cc5e08814ce4 is a different change to
58487c21b6a47c3fff6c6958684de866216a5593

The gcc-9 commit that corresponds to 58487c21b6a47c3fff6c6958684de866216a5593 
is d9940358fa46306072ce408c4b5a1fcb3d01a0a2 which was already in gcc-9.2.0