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// DR 743: A type without linkage shall not be used as the type of a

//     variable or function with linkage, unless

//   o the variable or function has extern "C" linkage (7.5 [dcl.link]), or

//   o the variable or function is not used (3.2 [basic.def.odr]) or is

//   defined in the same translation unit.

// { dg-options -std=c++0x }

template  struct B {

  void g(T){}

  void h(T);                    // { dg-error "never defined" }

  friend void i(B, T){}

  static T t1;                  // { dg-error "never defined" }

  static T t2;

};

template  T B::t2 = { };

enum {} e1;                     // OK, defined

extern enum {} e2;              // { dg-error "never defined" }

extern "C" enum {} e3;          // OK, extern "C"

void f() {

  struct A { int x; };  // no linkage

  A a = {1};

  B ba;              // declares B::g(A) and B::h(A)

  ba.t1 = a;            // error, B::t never defined

  ba.t2 = a;            // OK

  ba.g(a);              // OK

  ba.h(a);              // error, B::h never defined

  i(ba, a);             // OK

  e1+e2+e3;

}