[Bug c++/80456] calling constexpr member function from volatile-qualified member function: error: ‘this’ is not a constant expression

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80456

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yeah, it doesn't need to evaluate 'this' in that declaration, it's calling a
static member function.