1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/hashmap/hashset-enum-variant.rs b/tests/ui/hashmap/hashset-enum-variant.rs
new file mode 100644
index 00000000000..39a59d3a39b
--- /dev/null
+++ b/tests/ui/hashmap/hashset-enum-variant.rs
@@ -0,0 +1,32 @@
+//! Check for correct initialization of `HashSet` with enums. This is a regression test for a
+//! codegen bug that caused the `HashSet` to appear as if it contained one of each enum variant.
+//!
+//! Regression test for <https://github.com/rust-lang/rust/issues/42918>
+
+//@ run-pass
+//@ compile-flags: -O
+
+#![allow(dead_code)]
+
+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[..]);
+}