1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/wrong-hashset-issue-42918.rs b/tests/ui/wrong-hashset-issue-42918.rs
new file mode 100644
index 00000000000..ef834d915c9
--- /dev/null
+++ b/tests/ui/wrong-hashset-issue-42918.rs
@@ -0,0 +1,31 @@
+// run-pass
+//
+#![allow(dead_code)]
+// 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[..]);
+}