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warning: methods `f` and `g` are never used
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--> $DIR/issue-6128.rs:6:8
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LL | trait Graph<Node, Edge> {
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| ----- methods in this trait
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LL | fn f(&self, _: Edge);
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| ^
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LL | fn g(&self, _: Node);
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| ^
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= note: `#[warn(dead_code)]` on by default
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warning: 1 warning emitted
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