CIMPLICITYError Handling
| Erl | Return the line with the error |
| Err (function) | Return the error that caused the current error trap |
| Err (statement) | Set the value of the error |
| Error | Simulate a trappable runtime error |
| Error, Error$ | Return the text of a given error |
| On Error | Trap an error |
| Resume | Continue execution after an error trap |