[Bug c++/124542] [modules] internal compiler error: "error reporting routines re-entered" from recursive_lazy while testing in std module

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124542

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
static bool
recursive_lazy (unsigned snum = ~0u)
{
  if (lazy_snum)
    {
      error_at (input_location, "recursive lazy load");
      return true; 
    }
...
}

An easy way to fix it would be to use the new emitting_diagnostic_p.  But there
could be a better way too.