1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/associated-item/associated-item-duplicate-names.rs b/tests/ui/associated-item/associated-item-duplicate-names.rs
new file mode 100644
index 000000000..6677fad68
--- /dev/null
+++ b/tests/ui/associated-item/associated-item-duplicate-names.rs
@@ -0,0 +1,19 @@
+// Test for issue #23969
+
+
+trait Foo {
+    type Ty;
+    const BAR: u32;
+}
+
+impl Foo for () {
+    type Ty = ();
+    type Ty = usize; //~ ERROR duplicate definitions
+    const BAR: u32 = 7;
+    const BAR: u32 = 8; //~ ERROR duplicate definitions
+}
+
+fn main() {
+    let _: <() as Foo>::Ty = ();
+    let _: u32 = <() as Foo>::BAR;
+}