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warning: method `add_points` is never used
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--> $DIR/issue-3563-3.rs:115:8
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LL | trait Canvas {
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| ------ method in this trait
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...
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LL | fn add_points(&mut self, shapes: &[Point]) {
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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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