diff --git a/src/test/run-pass/issue-18353.rs b/src/test/run-pass/issue-18353.rs
new file mode 100644
index 00000000000..c734c1a3222
--- /dev/null
+++ b/src/test/run-pass/issue-18353.rs
@@ -0,0 +1,21 @@
+// Copyright 2014 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.
+
+// Test that wrapping an unsized struct in an enum which gets optimised does
+// not ICE.
+
+struct Str {
+    f: [u8]
+}
+
+fn main() {
+    let str: Option<&Str> = None;
+    str.is_some();
+}