1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/deriving/deriving-default-enum.rs b/tests/ui/deriving/deriving-default-enum.rs
new file mode 100644
index 00000000000..1c7a501edc7
--- /dev/null
+++ b/tests/ui/deriving/deriving-default-enum.rs
@@ -0,0 +1,27 @@
+// run-pass
+
+// nb: does not impl Default
+#[derive(Debug, PartialEq)]
+struct NotDefault;
+
+#[derive(Debug, Default, PartialEq)]
+enum Foo {
+    #[default]
+    Alpha,
+    #[allow(dead_code)]
+    Beta(NotDefault),
+}
+
+// #[default] on a generic enum does not add `Default` bounds to the type params.
+#[derive(Default)]
+enum MyOption<T> {
+    #[default]
+    None,
+    #[allow(dead_code)]
+    Some(T),
+}
+
+fn main() {
+    assert_eq!(Foo::default(), Foo::Alpha);
+    assert!(matches!(MyOption::<NotDefault>::default(), MyOption::None));
+}