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Get the last error associated with the stream.
const boost::system::error_code & error() const;
          An error_code corresponding to the last error from the stream.
        
To print the error associated with a failure to establish a connection:
tcp::iostream s("www.boost.org", "http");
if (!s)
{
  std::cout << "Error: " << s.error().message() << std::endl;
}