/in/foo.cc: In function 'int main()':
/in/foo.cc:61:20: error: no matching function for call to 'say(<unresolved overloaded function type>)'
   61 |                 say(endl);}
      |                 ~~~^~~~~~
/in/foo.cc:10:6: note: candidate: 'template<class __Tp> void say(__Tp)'
   10 | void say(__Tp x)
      |      ^~~
/in/foo.cc:10:6: note:   template argument deduction/substitution failed:
/in/foo.cc:61:20: note:   couldn't deduce template parameter '__Tp'
   61 |                 say(endl);}
      |                 ~~~^~~~~~