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