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?E in ?Sterm
E belongs to the set term Sterm.
- ?E
- A Prolog term.
- ?Sterm
- A set term.
Description
   This constraint states that E belongs to the set term Sterm.  If E is
   not a known value the constraint is delayed.  It is activated as soon as
   E becomes a known value.  If Sterm is a ground set and E is known it
   checks if E belongs to Sterm.
Fail Conditions
   Fails if E cannot belong to Sterm.
Resatisfiable
   No.
Examples
[eclipse 4]: S `:: {}.. {1,2,3}, E in S.
E = E
S = S{{} .. {1, 2, 3}}
Delayed goals:
        E in_s S{{} .. {1, 2, 3}}
yes.
[eclipse 5]: S `:: {}.. {1,2,3}, 1 in S.
S = S{{1} .. {1, 2, 3}}
yes.
See Also
`:: / 2, notin / 2