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error: usage of `contains_key` followed by `insert` on a `HashMap`
--> $DIR/entry_fixable.rs:12:5
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LL | / if !m.contains_key(&k) {
LL | | m.insert(k, v);
LL | | }
| |_____^ help: consider using: `m.entry(k).or_insert(v);`
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= note: `-D clippy::map-entry` implied by `-D warnings`
error: aborting due to previous error
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