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// check-pass
pub trait Sequence<Item, Subsequence: Sequence<Item, Subsequence>> {}
pub trait NodeWalk<Graph: GraphBase, NodeSubwalk: NodeWalk<Graph, NodeSubwalk>>:
Sequence<Graph::NodeIndex, NodeSubwalk>
{
}
pub trait GraphBase {
type NodeIndex;
}
pub trait WalkableGraph: GraphBase {}
fn main() {}
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