1 files changed, 39 insertions, 0 deletions
diff --git a/tests/ui/rfc-2632-const-trait-impl/specialization/const-default-const-specialized.rs b/tests/ui/rfc-2632-const-trait-impl/specialization/const-default-const-specialized.rs
new file mode 100644
index 000000000..9ddea427c
--- /dev/null
+++ b/tests/ui/rfc-2632-const-trait-impl/specialization/const-default-const-specialized.rs
@@ -0,0 +1,39 @@
+// Tests that a const default trait impl can be specialized by another const
+// trait impl and that the specializing impl will be used during const-eval.
+
+// run-pass
+
+#![feature(const_trait_impl)]
+#![feature(min_specialization)]
+
+#[const_trait]
+trait Value {
+    fn value() -> u32;
+}
+
+const fn get_value<T: ~const Value>() -> u32 {
+    T::value()
+}
+
+impl<T> const Value for T {
+    default fn value() -> u32 {
+        0
+    }
+}
+
+struct FortyTwo;
+
+impl const Value for FortyTwo {
+    fn value() -> u32 {
+        42
+    }
+}
+
+const ZERO: u32 = get_value::<()>();
+
+const FORTY_TWO: u32 = get_value::<FortyTwo>();
+
+fn main() {
+    assert_eq!(ZERO, 0);
+    assert_eq!(FORTY_TWO, 42);
+}