1 files changed, 87 insertions, 0 deletions
diff --git a/tests/ui/specialization/specialization-default-methods.rs b/tests/ui/specialization/specialization-default-methods.rs
new file mode 100644
index 00000000000..dcf68afa945
--- /dev/null
+++ b/tests/ui/specialization/specialization-default-methods.rs
@@ -0,0 +1,87 @@
+// run-pass
+
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
+
+// Test that default methods are cascaded correctly
+
+// First, test only use of explicit `default` items:
+
+trait Foo {
+    fn foo(&self) -> bool;
+}
+
+// Specialization tree for Foo:
+//
+//        T
+//       / \
+//    i32   i64
+
+impl<T> Foo for T {
+    default fn foo(&self) -> bool { false }
+}
+
+impl Foo for i32 {}
+
+impl Foo for i64 {
+    fn foo(&self) -> bool { true }
+}
+
+fn test_foo() {
+    assert!(!0i8.foo());
+    assert!(!0i32.foo());
+    assert!(0i64.foo());
+}
+
+// Next, test mixture of explicit `default` and provided methods:
+
+trait Bar {
+    fn bar(&self) -> i32 { 0 }
+}
+
+// Specialization tree for Bar.
+// Uses of $ designate that method is provided
+//
+//           $Bar   (the trait)
+//             |
+//             T
+//            /|\
+//           / | \
+//          /  |  \
+//         /   |   \
+//        /    |    \
+//       /     |     \
+//     $i32   &str  $Vec<T>
+//                    /\
+//                   /  \
+//            Vec<i32>  $Vec<i64>
+
+impl<T> Bar for T {
+    default fn bar(&self) -> i32 { 0 }
+}
+
+impl Bar for i32 {
+    fn bar(&self) -> i32 { 1 }
+}
+impl<'a> Bar for &'a str {}
+
+impl<T> Bar for Vec<T> {
+    default fn bar(&self) -> i32 { 2 }
+}
+impl Bar for Vec<i32> {}
+impl Bar for Vec<i64> {
+    fn bar(&self) -> i32 { 3 }
+}
+
+fn test_bar() {
+    assert!(0u8.bar() == 0);
+    assert!(0i32.bar() == 1);
+    assert!("hello".bar() == 0);
+    assert!(vec![()].bar() == 2);
+    assert!(vec![0i32].bar() == 2);
+    assert!(vec![0i64].bar() == 3);
+}
+
+fn main() {
+    test_foo();
+    test_bar();
+}