1// run-rustfix
2
3#![warn(clippy::map_entry)]
4#![allow(dead_code)]
5
6use std::collections::BTreeMap;
7
8fn foo() {}
9
10fn btree_map<K: Eq + Ord + Copy, V: Copy>(m: &mut BTreeMap<K, V>, k: K, v: V) {
11    // insert then do something, use if let
12    if let std::collections::btree_map::Entry::Vacant(e) = m.entry(k) {
13        e.insert(v);
14        foo();
15    }
16}
17
18fn main() {}
19