src/test/ui/associated-types/associated-types-struct-field-named.rs

   1 // run-pass
   2 // Test that we correctly normalize the type of a struct field
   3 // which has an associated type.
   4
   5
   6 pub trait UnifyKey {
   7     type Value;
   8
   9     fn dummy(&self) { }
  10 }
  11
  12 pub struct Node<K:UnifyKey> {
  13     pub key: K,
  14     pub value: K::Value,
  15 }
  16
  17 fn foo<K : UnifyKey<Value=Option<V>>,V : Clone>(node: &Node<K>) -> Option<V> {
  18     node.value.clone()
  19 }
  20
  21 impl UnifyKey for i32 {
  22     type Value = Option<u32>;
  23 }
  24
  25 impl UnifyKey for u32 {
  26     type Value = Option<i32>;
  27 }
  28
  29 pub fn main() {
  30     let node: Node<i32> = Node { key: 1, value: Some(22) };
  31     assert_eq!(foo(&node), Some(22));
  32
  33     let node: Node<u32> = Node { key: 1, value: Some(22) };
  34     assert_eq!(foo(&node), Some(22));
  35 }