1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/unsized-locals/unsized-exprs.rs b/src/test/ui/unsized-locals/unsized-exprs.rs
new file mode 100644
index 000000000..1729b9ffa
--- /dev/null
+++ b/src/test/ui/unsized-locals/unsized-exprs.rs
@@ -0,0 +1,28 @@
+#![feature(unsized_tuple_coercion, unsized_fn_params)]
+
+struct A<X: ?Sized>(X);
+
+fn udrop<T: ?Sized>(_x: T) {}
+fn foo() -> Box<[u8]> {
+    Box::new(*b"foo")
+}
+fn tfoo() -> Box<(i32, [u8])> {
+    Box::new((42, *b"foo"))
+}
+fn afoo() -> Box<A<[u8]>> {
+    Box::new(A(*b"foo"))
+}
+
+impl std::ops::Add<i32> for A<[u8]> {
+    type Output = ();
+    fn add(self, _rhs: i32) -> Self::Output {}
+}
+
+fn main() {
+    udrop::<(i32, [u8])>((42, *foo()));
+    //~^ERROR E0277
+    udrop::<A<[u8]>>(A { 0: *foo() });
+    //~^ERROR E0277
+    udrop::<A<[u8]>>(A(*foo()));
+    //~^ERROR E0277
+}