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warning: method `foo` is never used
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--> $DIR/issue-22536-copy-mustnt-zero.rs:8:8
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LL | trait Resources {
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| --------- method in this trait
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LL | type Buffer: Copy;
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LL | fn foo(&self) {}
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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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