[Bug c++/65642] [5 Regression] [C++11] GCC rejects valid constant expression

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65642

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Created attachment 35214
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35214&action=edit
pr65642.patch

Untested patch for example 1 and 3.