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Include element in set if it was not yet present.
Source position: system.fpd line 48
| procedure Include( | 
| var S: TSetType; | 
| E: TSetElement | 
| ); | 
Include includes E in the set S if it is not yet part of the set. E should be of the same type as the base type of the set S.
Thus, the two following statements do the same thing:
S:=S+[E]; Include(S,E);
For an example, see Exclude
If the type of the element E is not equal to the base type of the set S, the compiler will generate an error.
| 
 | Exlude element from a set if it is present. |