1 files changed, 44 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-trait-variance.rs b/src/test/ui/regions/regions-trait-variance.rs
new file mode 100644
index 000000000..94ffb85c9
--- /dev/null
+++ b/src/test/ui/regions/regions-trait-variance.rs
@@ -0,0 +1,44 @@
+// Issue #12470.
+
+trait X {
+    fn get_i(&self) -> isize;
+}
+
+struct B {
+    i: isize
+}
+
+impl X for B {
+    fn get_i(&self) -> isize {
+        self.i
+    }
+}
+
+impl Drop for B {
+    fn drop(&mut self) {
+        println!("drop");
+    }
+}
+
+struct A<'r> {
+    p: &'r (dyn X + 'r)
+}
+
+fn make_a(p: &dyn X) -> A {
+    A{p:p}
+}
+
+fn make_make_a<'a>() -> A<'a> {
+
+    let b: Box<B> = Box::new(B {
+        i: 1,
+    });
+
+    let bb: &B = &*b;
+    make_a(bb) //~ ERROR cannot return value referencing local data `*b`
+}
+
+fn main() {
+    let a = make_make_a();
+    println!("{}", a.p.get_i());
+}