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diff --git a/src/test/ui/run-pass/issues/issue-7673-cast-generically-implemented-trait.rs b/src/test/ui/run-pass/issues/issue-7673-cast-generically-implemented-trait.rs
new file mode 100644
index 00000000000..f5acebf3a66
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+++ b/src/test/ui/run-pass/issues/issue-7673-cast-generically-implemented-trait.rs
@@ -0,0 +1,30 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// pretty-expanded FIXME #23616
+
+/*
+
+#7673 Polymorphically creating traits barely works
+
+*/
+
+#![feature(box_syntax)]
+
+pub fn main() {}
+
+trait A {
+    fn dummy(&self) { }
+}
+
+impl<T: 'static> A for T {}
+
+fn owned2<T: 'static>(a: Box<T>) { a as Box<A>; }
+fn owned3<T: 'static>(a: Box<T>) { box a as Box<A>; }