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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 // <stack>
     11 
     12 // reference top();
     13 
     14 #include <stack>
     15 #include <cassert>
     16 
     17 int main()
     18 {
     19     std::stack<int> q;
     20     assert(q.size() == 0);
     21     q.push(1);
     22     q.push(2);
     23     q.push(3);
     24     int& ir = q.top();
     25     assert(ir == 3);
     26 }
     27