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Record a failure.
template< [role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type] = void> void fail( std::string const& reason = "");
| Name | Description | 
|---|---|
| 
                       | Optional text added to the output on a failure. | 
| 
                       | The source code file where the test failed. | 
| 
                       | The source code line number where the test failed. |