1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/nll/process_or_insert_default.rs b/tests/ui/nll/process_or_insert_default.rs
new file mode 100644
index 000000000..84ac9bbd0
--- /dev/null
+++ b/tests/ui/nll/process_or_insert_default.rs
@@ -0,0 +1,27 @@
+// run-pass
+
+use std::collections::HashMap;
+
+fn process_or_insert_default(map: &mut HashMap<usize, String>, key: usize) {
+    match map.get_mut(&key) {
+        Some(value) => {
+            process(value);
+        }
+        None => {
+            map.insert(key, "".to_string());
+        }
+    }
+}
+
+fn process(x: &str) {
+    assert_eq!(x, "Hello, world");
+}
+
+fn main() {
+    let map = &mut HashMap::new();
+    map.insert(22, format!("Hello, world"));
+    map.insert(44, format!("Goodbye, world"));
+    process_or_insert_default(map, 22);
+    process_or_insert_default(map, 66);
+    assert_eq!(map[&66], "");
+}