1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-const.rs b/src/test/ui/type-alias-impl-trait/assoc-type-const.rs
new file mode 100644
index 000000000..0ade36daf
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-const.rs
@@ -0,0 +1,32 @@
+// Tests that we properly detect defining usages when using
+// const generics in an associated opaque type
+// check-pass
+
+#![feature(type_alias_impl_trait)]
+
+trait UnwrapItemsExt<'a, const C: usize> {
+    type Iter;
+    fn unwrap_items(self) -> Self::Iter;
+}
+
+struct MyStruct<const C: usize> {}
+
+trait MyTrait<'a, const C: usize> {
+    type MyItem;
+    const MY_CONST: usize;
+}
+
+impl<'a, const C: usize> MyTrait<'a, C> for MyStruct<C> {
+    type MyItem = u8;
+    const MY_CONST: usize = C;
+}
+
+impl<'a, I, const C: usize> UnwrapItemsExt<'a, C> for I {
+    type Iter = impl MyTrait<'a, C>;
+
+    fn unwrap_items(self) -> Self::Iter {
+        MyStruct::<C> {}
+    }
+}
+
+fn main() {}