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Indicate a parsing failure.
void fail( error_code ec);
This changes the state of the parser to indicate that the parse has failed. A parser implementation can use this to fail the parser if needed due to external inputs.
          If !ec,
          the stored error code is unspecified.
        
Constant.
No-throw guarantee.
| Name | Description | 
|---|---|
| 
                     | The error code to set. If the code does not indicate failure, an implementation-defined error code that indicates failure will be stored instead. |