https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97197
--- Comment #4 from David Fink <davidfink314 at gmail dot com> --- Hi Jakub, I tried to reduce the code as much as possible before reporting, which is why the example has the "this != &o" check in the copy constructor. The original code where I saw this problem had the "this != &o" check in the assignment operator, and the copy constructor called the assignment operator. In the reported version, I manually inlined the assignment operator. I think the original code is also silly, but not as clearly wrong as the pointer check in the copy constructor. Note that the warning happens on a completely different class "Normal" from the silly code "Weirdo", so I'd consider that a bug in addition to the diagnostic containing 'target_mem_ref' and 'dump_expr<expression error>'.
