[Bug libstdc++/80183] [7 Regression] Conditional jump or move depends on uninitialised value: std::local_Rb_tree_decrement(std::_Rb_tree_node_base*) (tree.cc:97)

[fdumont at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80183

--- Comment #7 from François Dumont <fdumont at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> I think this is my fault, I asked François to remove a store to _M_color
> that I thought was redundant.

I was surprised that _M_color wasn't move along with other members, with your
patch it is now.

However to strictly restore previous behavior you could have only set _M_color
to red in the move constructor whether _M_move_data or _M_reset was called. But
I prefer current code of course.