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Return a test CompletionHandler which requires a specific error code.
        Defined in header <boost/beast/_experimental/test/handler.hpp>
      
handler fail_handler( error_code ec);
        This handler can be invoked with any signature whose first parameter is an
        error_code. The handler fails
        the test if:
      
| Name | Description | 
|---|---|
| 
                   | The error code to specify. |