[Bug c++/70323] [6 regression] missing error on integer overflow in constexpr function result converted to bool

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70323

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'm still getting the second error even with latest trunk, so can only
partially reproduce it:
pr70323.C:7:37:   in constexpr expansion of ‘overflow_if_1(1)’
pr70323.C:7:39: error: overflow in constant expression [-fpermissive]
 constexpr bool i1_1 = overflow_if_1 (1);   // error expected
                                       ^
I agree that r233878 introduced the only regression I can reproduce here.  No
revision between r234100 and r234359 emits no errors (checked all of them), so
you must have had some local changes in.