tests/ui/associated-types/associated-types-struct-field-numbered.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>(#[allow(unused_tuple_struct_fields)] K, K::Value);
  13
  14 fn foo<K : UnifyKey<Value=Option<V>>,V : Clone>(node: &Node<K>) -> Option<V> {
  15     node.1.clone()
  16 }
  17
  18 impl UnifyKey for i32 {
  19     type Value = Option<u32>;
  20 }
  21
  22 impl UnifyKey for u32 {
  23     type Value = Option<i32>;
  24 }
  25
  26 pub fn main() {
  27     let node: Node<i32> = Node(1, Some(22));
  28     assert_eq!(foo(&node), Some(22));
  29
  30     let node: Node<u32> = Node(1, Some(22));
  31     assert_eq!(foo(&node), Some(22));
  32 }