1 files changed, 11 insertions, 0 deletions
diff --git a/src/test/ui/unsized/unchanged-param.rs b/src/test/ui/unsized/unchanged-param.rs
new file mode 100644
index 000000000..6bdc89310
--- /dev/null
+++ b/src/test/ui/unsized/unchanged-param.rs
@@ -0,0 +1,11 @@
+// run-pass
+// Test that we allow unsizing even if there is an unchanged param in the
+// field getting unsized.
+struct A<T, U: ?Sized + 'static>(#[allow(unused_tuple_struct_fields)] T, B<T, U>);
+struct B<T, U: ?Sized>(#[allow(unused_tuple_struct_fields)] T, U);
+
+fn main() {
+    let x: A<[u32; 1], [u32; 1]> = A([0; 1], B([0; 1], [0; 1]));
+    let y: &A<[u32; 1], [u32]> = &x;
+    assert_eq!(y.1.1.len(), 1);
+}