1 files changed, 12 insertions, 0 deletions
diff --git a/tests/ui/unsized/unsized-trait-impl-trait-arg.rs b/tests/ui/unsized/unsized-trait-impl-trait-arg.rs
new file mode 100644
index 000000000..96e7e371f
--- /dev/null
+++ b/tests/ui/unsized/unsized-trait-impl-trait-arg.rs
@@ -0,0 +1,12 @@
+// Test sized-ness checking in substitution in impls.
+
+// impl - unbounded
+trait T2<Z> {
+    fn foo(&self, z: Z);
+}
+struct S4<Y: ?Sized>(Box<Y>);
+impl<X: ?Sized> T2<X> for S4<X> {
+    //~^ ERROR the size for values of type
+}
+
+fn main() { }