// run-rustfix #![allow(unused, clippy::needless_pass_by_value)] #![warn(clippy::map_entry)] use std::collections::{BTreeMap, HashMap}; use std::hash::Hash; fn foo() {} fn insert_if_absent0<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) { if !m.contains_key(&k) { m.insert(k, v); } } fn main() {}