foo.cc: In function ‘int main()’:
foo.cc:10:19: warning: the address of ‘std::ios_base& std::right(ios_base&)’ will never be NULL [-Waddress]
   10 |                 a=right;
      |                   ^~~~~
In file included from /nix/gcc-13.3.0/include/c++/13.3.0/ios:44,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/ostream:40,
                 from iostream:41:
/nix/gcc-13.3.0/include/c++/13.3.0/bits/ios_base.h:1050:3: note: ‘std::ios_base& std::right(ios_base&)’ declared here
 1050 |   right(ios_base& __base)
      |   ^~~~~