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Test if CHRConst is in the CHR constraint store or not
- A CHR constraint
This predicate is used to test if a particular CHR constraint is in the
CHR constraint store or not. It can be used to prevent the addition of
redundant constraints. This only useful if the 'already_in_store'
option is off.
This predicate is sensitive to its module context (tool predicate, see @/2).
X leq Y, Y leq Z ==> \+in_chrstore(X leq Z)| X leq Z.