error: usage of `contains_key` followed by `insert` on a `HashMap`
  --> $DIR/entry_unfixable.rs:10:5
   |
LL | /     if !m.contains_key(&k) {
LL | |         m.insert(k, v)
LL | |     } else {
LL | |         None
LL | |     };
   | |_____^ consider using `m.entry(k)`
   |
   = note: `-D clippy::map-entry` implied by `-D warnings`

error: usage of `contains_key` followed by `insert` on a `HashMap`
  --> $DIR/entry_unfixable.rs:18:5
   |
LL | /     if m.contains_key(&k) {
LL | |         None
LL | |     } else {
LL | |         m.insert(k, v)
LL | |     };
   | |_____^ consider using `m.entry(k)`

error: usage of `contains_key` followed by `insert` on a `HashMap`
  --> $DIR/entry_unfixable.rs:26:5
   |
LL | /     if !m.contains_key(&k) {
LL | |         foo();
LL | |         m.insert(k, v)
LL | |     } else {
LL | |         None
LL | |     };
   | |_____^ consider using `m.entry(k)`

error: usage of `contains_key` followed by `insert` on a `HashMap`
  --> $DIR/entry_unfixable.rs:35:5
   |
LL | /     if m.contains_key(&k) {
LL | |         None
LL | |     } else {
LL | |         foo();
LL | |         m.insert(k, v)
LL | |     };
   | |_____^ consider using `m.entry(k)`

error: usage of `contains_key` followed by `insert` on a `BTreeMap`
  --> $DIR/entry_unfixable.rs:44:5
   |
LL | /     if !m.contains_key(&k) {
LL | |         foo();
LL | |         m.insert(k, v)
LL | |     } else {
LL | |         None
LL | |     };
   | |_____^ consider using `m.entry(k)`

error: aborting due to 5 previous errors