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/* { dg-do compile } */

/* PR c++/21087 */

/* We used to overload the template function with the built-in

   declaration, instead of replacing it as we should, and then barf at

   the using decl because of a test that none of the overload set

   members were anticipated built-ins.  */

extern "C" signed int toupper(signed int __c) throw();

namespace std

{

  template< typename a > a toupper(a,int){}

  using ::toupper;

}

int f () {

  std::toupper((signed int)'a');

}