1 files changed, 10 insertions, 0 deletions
diff --git a/tests/ui/unsized/param-mentioned-by-different-field.rs b/tests/ui/unsized/param-mentioned-by-different-field.rs
new file mode 100644
index 000000000..cda94b306
--- /dev/null
+++ b/tests/ui/unsized/param-mentioned-by-different-field.rs
@@ -0,0 +1,10 @@
+// We must not allow this with our current setup as `T`
+// is mentioned both in the tail of `Foo` and by another
+// field.
+struct Foo<T: ?Sized>(Box<T>, T);
+
+fn main() {
+    let x: Foo<[u8; 1]> = Foo(Box::new([2]), [3]);
+    let y: &Foo<[u8]> = &x; //~ ERROR mismatched types
+    assert_eq!(y.0.len(), 1);
+}