diff --git a/src/test/run-pass/wrong-hashset-issue-42918.rs b/src/test/run-pass/wrong-hashset-issue-42918.rs
new file mode 100644
index 0000000000000..5a23adeceb5c0
--- /dev/null
+++ b/src/test/run-pass/wrong-hashset-issue-42918.rs
@@ -0,0 +1,38 @@
+// Copyright 2017 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.
+//
+// compile-flags: -O
+
+use std::collections::HashSet;
+
+#[derive(PartialEq, Debug, Hash, Eq, Clone, PartialOrd, Ord)]
+enum MyEnum {
+    E0,
+
+    E1,
+
+    E2,
+    E3,
+    E4,
+
+    E5,
+    E6,
+    E7,
+}
+
+
+fn main() {
+    use MyEnum::*;
+    let s: HashSet<_> = [E4, E1].iter().cloned().collect();
+    let mut v: Vec<_> = s.into_iter().collect();
+    v.sort();
+
+    assert_eq!([E1, E4], &v[..]);
+}