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      1 // RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
      2 // pr6644
      3 
      4 extern "C" {
      5   namespace N {
      6     struct X {
      7       virtual void f();
      8     };
      9     void X::f() { }
     10   }
     11 }
     12 
     13 // CHECK-LABEL: define {{.*}}void @_ZN1N1X1fEv
     14 
     15 extern "C" {
     16   static void test2_f() {
     17   }
     18   // CHECK-LABEL: define internal void @_Z7test2_fv
     19   static void test2_f(int x) {
     20   }
     21   // CHECK-LABEL: define internal void @_Z7test2_fi
     22   void test2_use() {
     23     test2_f();
     24     test2_f(42);
     25   }
     26 }
     27 
     28 extern "C" {
     29   struct test3_s {
     30   };
     31   bool operator==(const int& a, const test3_s& b)  {
     32   }
     33 }
     34