[Bug libstdc++/116070] [13/14/15 Regression] broken headers for compile with flags -std=gnu++14 -fconcepts

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116070

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Alexey from comment #4)
> But expecting that simple code able to be compiled after the upgrade :D

The problem is not the "simple code" it's your choice of flags.