clang/test/SemaCXX/friend.cpp

// RUN: %clang_cc1 -fsyntax-only -verify %s

friend class A; // expected-error {{'friend' used outside of class}}
void f() { friend class A; } // expected-error {{'friend' used outside of class}}
class C { friend class A; };
class D { void f() { friend class A; } }; // expected-error {{'friend' used outside of class}}

// PR5760
namespace test0 {
  namespace ns {
    void f(int);
  }

  struct A {
    friend void ns::f(int a);
  };
}