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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <functional>
     11 
     12 // class function<R(ArgTypes...)>
     13 
     14 // function(nullptr_t);
     15 
     16 #include <functional>
     17 #include <cassert>
     18 
     19 int main()
     20 {
     21     std::function<int(int)> f(nullptr);
     22     assert(!f);
     23 }
     24