make cloned generic over deref... and have its tests actually run

1 files changed, 24 insertions, 9 deletions

diff --git a/src/libcoretest/option.rs b/src/libcoretest/option.rs
index 6138986e1d1..a5927d47eb0 100644
--- a/src/libcoretest/option.rs
+++ b/src/libcoretest/option.rs
@@ -241,14 +241,29 @@ fn test_collect() {
     assert!(v == None);
 }
 
+#[test]
 fn test_cloned() {
-    let s = 1u32;
-    let n: Option<&'static u32> = None;
-    let o = Some(&s);
-
-    assert_eq!(o.clone(), Some(&s));
-    assert_eq!(o.cloned(), Some(1u32));
-
-    assert_eq!(n.clone(), None);
-    assert_eq!(n.cloned(), None);
+    let val1 = 1u32;
+    let mut val2 = 2u32;
+    let val1_ref = &val1;
+    let opt_none: Option<&'static u32> = None;
+    let opt_ref = Some(&val1);
+    let opt_ref_ref = Some(&val1_ref);
+    let opt_mut_ref = Some(&mut val2);
+
+    // None works
+    assert_eq!(opt_none.clone(), None);
+    assert_eq!(opt_none.cloned(), None);
+
+    // Mutable refs work
+    assert_eq!(opt_mut_ref.cloned(), Some(2u32));
+
+    // Immutable ref works
+    assert_eq!(opt_ref.clone(), Some(&val1));
+    assert_eq!(opt_ref.cloned(), Some(1u32));
+
+    // Double Immutable ref works
+    assert_eq!(opt_ref_ref.clone(), Some(&val1_ref));
+    assert_eq!(opt_ref_ref.clone().cloned(), Some(&val1));
+    assert_eq!(opt_ref_ref.cloned().cloned(), Some(1u32));
 }
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