test discriminant of enum with uninhabited variant

Author: lcnr

src/test/ui/consts/const_discriminant.rs

@@ -15,10 +15,21 @@ const TEST_A: Discriminant<Test> = discriminant(&Test::A(5));
 const TEST_A_OTHER: Discriminant<Test> = discriminant(&Test::A(17));
 const TEST_B: Discriminant<Test> = discriminant(&Test::B);
 
+enum Void {}
+
+enum SingleVariant {
+    V,
+    Never(Void),
+}
+
+const TEST_V: Discriminant<SingleVariant> = discriminant(&SingleVariant::V);
+
 fn main() {
     assert_eq!(TEST_A, TEST_A_OTHER);
     assert_eq!(TEST_A, discriminant(identity(&Test::A(17))));
     assert_eq!(TEST_B, discriminant(identity(&Test::B)));
     assert_ne!(TEST_A, TEST_B);
     assert_ne!(TEST_B, discriminant(identity(&Test::C { a: 42, b: 7 })));
+
+    assert_eq!(TEST_V, discriminant(identity(&SingleVariant::V)));
 }