[Bug c++/93169] [10 regression] Variable incorrectly put into readonly section.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93169

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The relevant rule is http://eel.is/c++draft/dcl.constexpr#7 but that whole
subclause is new since C++03 :-)