text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <streambuf>
  
  // template <class charT, class traits = char_traits<charT> >
  // class basic_streambuf;
  
  // int_type uflow();
  
  #include <streambuf>
  #include <cassert>
  
  int underflow_called = 0;
  
  struct test
      : public std::basic_streambuf<char>
  {
      test() {}
  
  };
  
  int main()
  {
      test t;
      assert(t.sgetc() == -1);
  }
  