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#include <iostream>
#include <set>
using namespace std;
 
void foo(set<foobar>);
 
class foobar
{
   public:
 
   int x;
 
};
 
int main()
{
 
  set<foobar> foobar_set;
 
  foo(foobar_set);
 
 
}
 
void foo(set<foobar> foobar_set)
{
 
}

prog.cpp:5:14: error: ‘foobar’ was not declared in this scope
 void foo(set<foobar>);
              ^
prog.cpp:5:20: error: template argument 1 is invalid
 void foo(set<foobar>);
                    ^
prog.cpp:5:20: error: template argument 2 is invalid
prog.cpp:5:20: error: template argument 3 is invalid
prog.cpp: In function ‘int main()’:
prog.cpp:20:17: error: cannot convert ‘std::set<foobar>’ to ‘int’ for argument ‘1’ to ‘void foo(int)’
   foo(foobar_set);
                 ^

Standard output is empty