Contains Subtree Constraint #53
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ContainsSubtree. This constraint enforces that a given subtree appears in the program tree at least once. This constraint also supportsVarNodes. (e.g.RuleNode(3, [VarNode(:a), VarNode(:a)])enforces that rule3is used two identical children at least once.)LocalUnique: when propagated in theUniformSolver, it now caches the holes that potentially hold the target rule instead of traversing the tree on each repropagation.