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error: usage of `contains_key` followed by `insert` on a `BTreeMap`
--> $DIR/entry_btree.rs:12:5
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LL | / if !m.contains_key(&k) {
LL | | m.insert(k, v);
LL | | foo();
LL | | }
| |_____^
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= note: `-D clippy::map-entry` implied by `-D warnings`
help: try this
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LL ~ if let std::collections::btree_map::Entry::Vacant(e) = m.entry(k) {
LL + e.insert(v);
LL + foo();
LL + }
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error: aborting due to previous error
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