foo.cc: In function ‘int main()’:
foo.cc:6:12: error: no match for ‘operator<<’ (operand types are ‘std::istream’ {aka ‘std::basic_istream<char>’} and ‘int’)
    6 |         cin<<n<<p;
      |         ~~~^~~
      |         |    |
      |         |    int
      |         std::istream {aka std::basic_istream<char>}
foo.cc:6:12: note: candidate: ‘operator<<(int, int)’ (built-in)
    6 |         cin<<n<<p;
      |         ~~~^~~
foo.cc:6:12: note:   no known conversion for argument 1 from ‘std::istream’ {aka ‘std::basic_istream<char>’} to ‘int’
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/regex:68,
                 from stdc++.h:181:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/regex.h:1715:5: note: candidate: ‘template<class _Ch_type, class _Ch_traits, class _Bi_iter> std::basic_ostream<_CharT, _Traits>& std::__cxx11::operator<<(std::basic_ostream<_CharT, _Traits>&, const sub_match<_Bi_iter>&)’
 1715 |     operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/regex.h:1715:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/string:54,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bitset:52,
                 from stdc++.h:52:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/basic_string.h:4077:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 4077 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/basic_string.h:4077:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bitset:1687:5: note: candidate: ‘template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const bitset<_Nb>&)’
 1687 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bitset:1687:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/ios_base.h:46,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/streambuf:43,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/streambuf_iterator.h:35,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iterator:66,
                 from stdc++.h:54:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/system_error:339:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const error_code&)’
  339 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/system_error:339:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/memory:80,
                 from stdc++.h:56:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/shared_ptr.h:70:5: note: candidate: ‘template<class _Ch, class _Tr, class _Tp, __gnu_cxx::_Lock_policy _Lp> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __shared_ptr<_Tp, _Lp>&)’
   70 |     operator<<(std::basic_ostream<_Ch, _Tr>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/shared_ptr.h:70:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:41,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/sstream:40,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/complex:45,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ccomplex:39,
                 from stdc++.h:127:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:563:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _CharT)’
  563 |     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:563:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:573:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, char)’
  573 |     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:573:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:579:5: note: candidate: ‘template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, char)’
  579 |     operator<<(basic_ostream<char, _Traits>& __out, char __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:579:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<char, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:590:5: note: candidate: ‘template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, signed char)’
  590 |     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:590:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<char, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:595:5: note: candidate: ‘template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, unsigned char)’
  595 |     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:595:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<char, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:654:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const _CharT*)’
  654 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:654:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:1022:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/ostream.tcc:307:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const char*)’
  307 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/ostream.tcc:307:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:671:5: note: candidate: ‘template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const char*)’
  671 |     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:671:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<char, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:684:5: note: candidate: ‘template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const signed char*)’
  684 |     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:684:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<char, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:689:5: note: candidate: ‘template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const unsigned char*)’
  689 |     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:689:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<char, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:810:5: note: candidate: ‘template<class _Ostream, class _Tp> _Ostream&& std::operator<<(_Ostream&&, const _Tp&)’
  810 |     operator<<(_Ostream&& __os, const _Tp& __x)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:810:5: note:   template argument deduction/substitution failed:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream: In substitution of ‘template<class _Ostream, class _Tp> _Ostream&& std::operator<<(_Ostream&&, const _Tp&) [with _Ostream = std::basic_istream<char>&; _Tp = int]’:
foo.cc:6:7:   required from here
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/ostream:810:5: error: no type named ‘type’ in ‘struct std::enable_if<false, void>’
  810 |     operator<<(_Ostream&& __os, const _Tp& __x)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/complex:563:5: note: candidate: ‘template<class _Tp, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const complex<_Tp>&)’
  563 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/complex:563:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from stdc++.h:143:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:84:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Resetiosflags)’
   84 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:84:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:114:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setiosflags)’
  114 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:114:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:148:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setbase)’
  148 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:148:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:185:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setfill<_CharT>)’
  185 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:185:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:215:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setprecision)’
  215 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:215:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:245:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setw)’
  245 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:245:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:318:5: note: candidate: ‘template<class _CharT, class _Traits, class _MoneyT> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Put_money<_MoneyT>)’
  318 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_money<_MoneyT> __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:318:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:370:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Put_time<_CharT>)’
  370 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_time<_CharT> __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:370:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:605,
                 from stdc++.h:166:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note: candidate: ‘template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)’
  413 |     _DEFINE_EXPR_BINARY_OPERATOR(<<, struct std::__shift_left)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note: candidate: ‘template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)’
  413 |     _DEFINE_EXPR_BINARY_OPERATOR(<<, struct std::__shift_left)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note: candidate: ‘template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)’
  413 |     _DEFINE_EXPR_BINARY_OPERATOR(<<, struct std::__shift_left)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   mismatched types ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’ and ‘int’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note: candidate: ‘template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)’
  413 |     _DEFINE_EXPR_BINARY_OPERATOR(<<, struct std::__shift_left)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note: candidate: ‘template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)’
  413 |     _DEFINE_EXPR_BINARY_OPERATOR(<<, struct std::__shift_left)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:413:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   mismatched types ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’ and ‘int’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1204:1: note: candidate: ‘template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const valarray<_Tp>&, const valarray<_Tp>&)’
 1204 | _DEFINE_BINARY_OPERATOR(<<, __shift_left)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1204:1: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::valarray<_Tp>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1204:1: note: candidate: ‘template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)’
 1204 | _DEFINE_BINARY_OPERATOR(<<, __shift_left)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1204:1: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::valarray<_Tp>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1204:1: note: candidate: ‘template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)’
 1204 | _DEFINE_BINARY_OPERATOR(<<, __shift_left)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1204:1: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   mismatched types ‘const std::valarray<_Tp>’ and ‘int’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/random:48,
                 from stdc++.h:179:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.h:1443:5: note: candidate: ‘template<class _RandomNumberEngine, long unsigned int __w, class _UIntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const independent_bits_engine<_RandomNumberEngine, __w, _UIntType>&)’
 1443 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.h:1443:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/random:50:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:910:5: note: candidate: ‘template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const uniform_int_distribution<_IntType>&)’
  910 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:910:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:968:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const uniform_real_distribution<_IntType>&)’
  968 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:968:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2145:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const cauchy_distribution<_RealType>&)’
 2145 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2145:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1029:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const bernoulli_distribution&)’
 1029 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1029:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1110:5: note: candidate: ‘template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const geometric_distribution<_IntType>&)’
 1110 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1110:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1762:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const exponential_distribution<_RealType>&)’
 1762 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1762:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2539:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const weibull_distribution<_RealType>&)’
 2539 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2539:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2613:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const extreme_value_distribution<_RealType>&)’
 2613 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2613:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:156:5: note: candidate: ‘template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const linear_congruential_engine<_UIntType, __a, __c, __m>&)’
  156 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:156:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:477:5: note: candidate: ‘template<class _UIntType1, long unsigned int __w1, long unsigned int __n1, long unsigned int __m1, long unsigned int __r1, _UIntType1 __a1, long unsigned int __u1, _UIntType1 __d1, long unsigned int __s1, _UIntType1 __b1, long unsigned int __t1, _UIntType1 __c1, long unsigned int __l1, _UIntType1 __f1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>&)’
  477 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:477:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:635:5: note: candidate: ‘template<class _UIntType, long unsigned int __w, long unsigned int __s, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const subtract_with_carry_engine<_UIntType, __w, __s, __r>&)’
  635 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:635:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:704:5: note: candidate: ‘template<class _RandomNumberEngine, long unsigned int __p, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const discard_block_engine<_RandomNumberEngine, __p, __r>&)’
  704 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:704:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:866:5: note: candidate: ‘template<class _RandomNumberEngine, long unsigned int __k, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const shuffle_order_engine<_RandomNumberEngine, __k>&)’
  866 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:866:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1224:5: note: candidate: ‘template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const negative_binomial_distribution<_IntType>&)’
 1224 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1224:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1434:5: note: candidate: ‘template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const poisson_distribution<_IntType>&)’
 1434 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1434:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1700:5: note: candidate: ‘template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const binomial_distribution<_IntType>&)’
 1700 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1700:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1920:5: note: candidate: ‘template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const normal_distribution<_RealType>&)’
 1920 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1920:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1987:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const lognormal_distribution<_RealType>&)’
 1987 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:1987:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2059:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const chi_squared_distribution<_RealType>&)’
 2059 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2059:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2220:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const fisher_f_distribution<_RealType>&)’
 2220 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2220:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2294:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const student_t_distribution<_RealType>&)’
 2294 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2294:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2463:5: note: candidate: ‘template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const gamma_distribution<_RealType>&)’
 2463 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2463:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2749:5: note: candidate: ‘template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const discrete_distribution<_IntType>&)’
 2749 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2749:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2971:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const piecewise_constant_distribution<_RealType>&)’
 2971 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:2971:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:3177:5: note: candidate: ‘template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const piecewise_linear_distribution<_RealType>&)’
 3177 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/random.tcc:3177:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^
In file included from stdc++.h:184:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/thread:105:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, thread::id)’
  105 |     operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/thread:105:5: note:   template argument deduction/substitution failed:
foo.cc:6:14: note:   ‘std::istream’ {aka ‘std::basic_istream<char>’} is not derived from ‘std::basic_ostream<_CharT, _Traits>’
    6 |         cin<<n<<p;
      |              ^