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Enumeration type, indicating what to do with duplicates in a list.
Source position: types.pp line 167
| type TDuplicates = ( | ||
| dupIgnore, | 
 | Ignore the new item, do not add it to the list. | 
| dupAccept, | 
 | Accept duplicates, adding them to the list. | 
| dupError | 
 | Raise an error when an attempt is made to add a duplicate. | 
| ); | 
TDuplicates can be used to indicate how a list structure acts on the addition of a duplicate item to the list.