rust/tests/compile-fail/hashmap.rs

#![feature(plugin)]
#![plugin(clippy)]
#![allow(unused)]

#![deny(hashmap_entry)]

use std::collections::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); }
    //~^ERROR: usage of `contains_key` followed by `insert` on `HashMap`
    //~^^HELP: Consider using `m.entry(k).or_insert(v)`
}

fn insert_if_absent1<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
    if !m.contains_key(&k) { foo(); m.insert(k, v); }
    //~^ERROR: usage of `contains_key` followed by `insert` on `HashMap`
    //~^^HELP: Consider using `m.entry(k)`
}

fn insert_if_absent2<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
    if !m.contains_key(&k) { m.insert(k, v) } else { None };
    //~^ERROR: usage of `contains_key` followed by `insert` on `HashMap`
    //~^^HELP: Consider using `m.entry(k).or_insert(v)`
}

fn insert_if_absent3<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, v: V) {
    if !m.contains_key(&k) { foo(); m.insert(k, v) } else { None };
    //~^ERROR: usage of `contains_key` followed by `insert` on `HashMap`
    //~^^HELP: Consider using `m.entry(k)`
}

fn insert_other_if_absent<K: Eq + Hash, V>(m: &mut HashMap<K, V>, k: K, o: K, v: V) {
    if !m.contains_key(&k) { m.insert(o, v); }
}

fn main() {
}