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Enumeration type, indicating what to do with duplicates in a list.
Source position: types.pp line 167
type TDuplicates = (  | 
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dupIgnore,  | 
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Ignore the new item, do not add it to the list.  | 
dupAccept,  | 
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Accept duplicates, adding them to the list.  | 
dupError  | 
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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.