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#include <iostream>
class Y {
public:
  Y();
  void f();
};
Y::Y()      { std::cout << "Initializing Y\n"; }
void Y::f() { std::cout << "Using Y\n"; }
class X {
public:
  X(Y& y);
};
X::X(Y& y) { y.f(); }
class Z {
public:
  Z();
protected:
  X x_;
  Y y_;
};
Z::Z() throw()
  : y_()
  , x_(y_)
    ↑↑   // Bad: should have listed x_ before y_
{ }
int main()
{
  Z z;
  return 0;
}

Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, or enum expected
#include <iostream>
         ^
Main.java:3: error: illegal start of type
public:
      ^
Main.java:3: error: ';' expected
public:
       ^
Main.java:4: error: illegal start of type
  Y();
   ^
Main.java:4: error: <identifier> expected
  Y();
    ^
Main.java:7: error: class, interface, or enum expected
Y::Y()      { std::cout << "Initializing Y\n"; }
^
Main.java:7: error: class, interface, or enum expected
Y::Y()      { std::cout << "Initializing Y\n"; }
                                               ^
Main.java:8: error: class, interface, or enum expected
void Y::f() { std::cout << "Using Y\n"; }
                                        ^
Main.java:10: error: illegal start of type
public:
      ^
Main.java:10: error: ';' expected
public:
       ^
Main.java:11: error: illegal start of type
  X(Y& y);
   ^
Main.java:11: error: ';' expected
  X(Y& y);
     ^
Main.java:11: error: <identifier> expected
  X(Y& y);
        ^
Main.java:13: error: class, interface, or enum expected
X::X(Y& y) { y.f(); }
^
Main.java:13: error: class, interface, or enum expected
X::X(Y& y) { y.f(); }
                    ^
Main.java:15: error: illegal start of type
public:
      ^
Main.java:15: error: ';' expected
public:
       ^
Main.java:16: error: illegal start of type
  Z();
   ^
Main.java:16: error: <identifier> expected
  Z();
    ^
Main.java:17: error: illegal start of type
protected:
         ^
Main.java:17: error: ';' expected
protected:
          ^
Main.java:18: error: <identifier> expected
  X x_;
      ^
Main.java:21: error: class, interface, or enum expected
Z::Z() throw()
^
Main.java:24: error: illegal character: '\u2191'
    ??   // Bad: should have listed x_ before y_
    ^
Main.java:24: error: illegal character: '\u2191'
    ??   // Bad: should have listed x_ before y_
     ^
Main.java:29: error: class, interface, or enum expected
  return 0;
  ^
Main.java:30: error: class, interface, or enum expected
}
^
28 errors

Standard output is empty