Expand description
Port of RuleWatchGraph, RuleWatchNode, RuleWatchChain: two watched
literals per rule (all of them for a MultiConflictRule), one chain per
literal, inserted at the head of the list (unshift).
Port of RuleWatchGraph, RuleWatchNode, RuleWatchChain: two watched
literals per rule (all of them for a MultiConflictRule), one chain per
literal, inserted at the head of the list (unshift).