src/test/ui/nll/process_or_insert_default.rs

   1 // run-pass
   2
   3 use std::collections::HashMap;
   4
   5 fn process_or_insert_default(map: &mut HashMap<usize, String>, key: usize) {
   6     match map.get_mut(&key) {
   7         Some(value) => {
   8             process(value);
   9         }
  10         None => {
  11             map.insert(key, "".to_string());
  12         }
  13     }
  14 }
  15
  16 fn process(x: &str) {
  17     assert_eq!(x, "Hello, world");
  18 }
  19
  20 fn main() {
  21     let map = &mut HashMap::new();
  22     map.insert(22, format!("Hello, world"));
  23     map.insert(44, format!("Goodbye, world"));
  24     process_or_insert_default(map, 22);
  25     process_or_insert_default(map, 66);
  26     assert_eq!(map[&66], "");
  27 }