[Bug c++/71561] [5/6/7 Regression] ICE with -Wall on valid C++ code on x86_64-linux-gnu: in potential_constant_expression_1, at cp/constexpr.c:5249

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71561

--- Comment #4 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Jason Merrill from comment #3)
> Dup.
> 
> *** This bug has been marked as a duplicate of bug 71728 ***

But this was reported a couple of weeks earlier; it'd make more sense to mark
71728 as a dup.