foo.cc: In function ‘int main()’:
foo.cc:7:12: error: no match for ‘operator>’ (operand types are ‘std::istream’ {aka ‘std::basic_istream<char>’} and ‘int’)
    7 |         cin>x>>y>>z;
      |         ~~~^~~~~~~~
      |         |       |
      |         |       int
      |         std::istream {aka std::basic_istream<char>}
foo.cc:7:12: note: candidate: ‘operator>(int, int)’ (built-in)
    7 |         cin>x>>y>>z;
      |         ~~~^~~~~~~~
foo.cc:7:12: note:   no known conversion for argument 1 from ‘std::istream’ {aka ‘std::basic_istream<char>’} to ‘int’
In file included from /nix/gcc-13.3.0/include/c++/13.3.0/string:48,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/bits/locale_classes.h:40,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/bits/ios_base.h:41,
                 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/stl_iterator.h:469:5: note: candidate: ‘template<class _Iterator> bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)’
  469 |     operator>(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_iterator.h:469:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::reverse_iterator<_Iterator>’
    7 |         cin>x>>y>>z;
      |                   ^
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_iterator.h:514:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)’
  514 |     operator>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_iterator.h:514:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::reverse_iterator<_Iterator>’
    7 |         cin>x>>y>>z;
      |                   ^
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_iterator.h:1725:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)’
 1725 |     operator>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_iterator.h:1725:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::move_iterator<_IteratorL>’
    7 |         cin>x>>y>>z;
      |                   ^
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_iterator.h:1784:5: note: candidate: ‘template<class _Iterator> bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)’
 1784 |     operator>(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_iterator.h:1784:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::move_iterator<_IteratorL>’
    7 |         cin>x>>y>>z;
      |                   ^
In file included from /nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_algobase.h:64,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/string:51:
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_pair.h:848:5: note: candidate: ‘template<class _T1, class _T2> constexpr bool std::operator>(const pair<_T1, _T2>&, const pair<_T1, _T2>&)’
  848 |     operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/stl_pair.h:848:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::pair<_T1, _T2>’
    7 |         cin>x>>y>>z;
      |                   ^
In file included from /nix/gcc-13.3.0/include/c++/13.3.0/string:54:
/nix/gcc-13.3.0/include/c++/13.3.0/bits/basic_string.h:3870:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const __cxx11::basic_string<_CharT, _Traits, _Alloc>&, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 3870 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/basic_string.h:3870:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
    7 |         cin>x>>y>>z;
      |                   ^
/nix/gcc-13.3.0/include/c++/13.3.0/bits/basic_string.h:3884:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const __cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)’
 3884 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/basic_string.h:3884:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
    7 |         cin>x>>y>>z;
      |                   ^
/nix/gcc-13.3.0/include/c++/13.3.0/bits/basic_string.h:3897:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 3897 |     operator>(const _CharT* __lhs,
      |     ^~~~~~~~
/nix/gcc-13.3.0/include/c++/13.3.0/bits/basic_string.h:3897:5: note:   template argument deduction/substitution failed:
foo.cc:7:19: note:   mismatched types ‘const _CharT*’ and ‘std::basic_istream<char>’
    7 |         cin>x>>y>>z;
      |                   ^
foo.cc:21:1: error: expected primary-expression before ‘}’ token
   21 | }
      | ^