Comment 6 for bug 1352356

This is a more correct testcase, which also preserves the property of OT that -pedantic works around the issue. Note: removing the string constructor taking an initializer_list also works around the problem:

///////////////////

#include <initializer_list>

namespace std
{
  template<typename _Key>
    struct set
    {
      void insert(const _Key&);
      void insert(initializer_list<_Key>);
    };

  struct string
  {
    string(const string&, __SIZE_TYPE__, __SIZE_TYPE__ = -1);
    string(const char*);
    string(initializer_list<char>);
  };
}

int main()
{
  std::set<std::string> s;
  s.insert( { "abc", "def", "hij"} );
}