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#include <iostream>
using namespace std;
typedef struct { int dummy; } BAZ;
 
class Foo {
  //private:
    //Foo(void) {}
 
  public:
    Foo(BAZ a) {  }
};
 
class Bar {
  private:
    Foo foo1;
    Foo foo2;
 
    //Bar(void) {}
 
  public:
    Bar(BAZ a, BAZ b) : foo1(a), foo2(b) {  }
};
 
int main() {
	Foo foo1;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:25:6: error: no matching function for call to ‘Foo::Foo()’
  Foo foo1;
      ^~~~
prog.cpp:10:5: note: candidate: Foo::Foo(BAZ)
     Foo(BAZ a) {  }
     ^~~
prog.cpp:10:5: note:   candidate expects 1 argument, 0 provided
prog.cpp:5:7: note: candidate: constexpr Foo::Foo(const Foo&)
 class Foo {
       ^~~
prog.cpp:5:7: note:   candidate expects 1 argument, 0 provided
prog.cpp:5:7: note: candidate: constexpr Foo::Foo(Foo&&)
prog.cpp:5:7: note:   candidate expects 1 argument, 0 provided

Standard output is empty