text: 
  // Copyright (C) 2008-2018 Lorenzo Caminiti
  // Distributed under the Boost Software License, Version 1.0 (see accompanying
  // file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
  // See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
  
  // Test auto error after old (for free func, but same for all contracts).
  
  #include <boost/contract/function.hpp>
  
  int main() {
      auto c = boost::contract::function() // Error (can't use auto).
          .precondition([] {})
          .old([] {})
      ;
      return 0;
  }
  
  