https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89181
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonny Grant from comment #0)
> Can the libstd++ header files show the same parameter names as the spec
> without __ etc?
No, of course not, consider:
#define n 20
#include <string>
int main() { return n; }
This valid program won't compile if the library headers use 'n'.
We don't do it for fun.
