1 files changed, 17 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-16562.rs b/tests/ui/issues/issue-16562.rs
new file mode 100644
index 00000000000..e16a35158c3
--- /dev/null
+++ b/tests/ui/issues/issue-16562.rs
@@ -0,0 +1,17 @@
+trait MatrixShape {}
+
+struct Col<D, C> {
+    data: D,
+    col: C,
+}
+
+trait Collection { fn len(&self) -> usize; }
+
+impl<T, M: MatrixShape> Collection for Col<M, usize> {
+//~^ ERROR type parameter `T` is not constrained
+    fn len(&self) -> usize {
+        unimplemented!()
+    }
+}
+
+fn main() {}