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-rw-r--r--src/libcoretest/num/int_macros.rs9
-rw-r--r--src/libcoretest/num/uint_macros.rs9
2 files changed, 18 insertions, 0 deletions
diff --git a/src/libcoretest/num/int_macros.rs b/src/libcoretest/num/int_macros.rs
index 940b036ca90..d078b514085 100644
--- a/src/libcoretest/num/int_macros.rs
+++ b/src/libcoretest/num/int_macros.rs
@@ -114,6 +114,15 @@ mod tests {
         assert_eq!(_1.rotate_left(124), _1);
         assert_eq!(_0.rotate_right(124), _0);
         assert_eq!(_1.rotate_right(124), _1);
+
+        // Rotating by 0 should have no effect
+        assert_eq!(A.rotate_left(0), A);
+        assert_eq!(B.rotate_left(0), B);
+        assert_eq!(C.rotate_left(0), C);
+        // Rotating by a multiple of word size should also have no effect
+        assert_eq!(A.rotate_left(64), A);
+        assert_eq!(B.rotate_left(64), B);
+        assert_eq!(C.rotate_left(64), C);
     }
 
     #[test]
diff --git a/src/libcoretest/num/uint_macros.rs b/src/libcoretest/num/uint_macros.rs
index 2272af67daf..aefaa90520e 100644
--- a/src/libcoretest/num/uint_macros.rs
+++ b/src/libcoretest/num/uint_macros.rs
@@ -74,6 +74,15 @@ mod tests {
         assert_eq!(_1.rotate_left(124), _1);
         assert_eq!(_0.rotate_right(124), _0);
         assert_eq!(_1.rotate_right(124), _1);
+
+        // Rotating by 0 should have no effect
+        assert_eq!(A.rotate_left(0), A);
+        assert_eq!(B.rotate_left(0), B);
+        assert_eq!(C.rotate_left(0), C);
+        // Rotating by a multiple of word size should also have no effect
+        assert_eq!(A.rotate_left(64), A);
+        assert_eq!(B.rotate_left(64), B);
+        assert_eq!(C.rotate_left(64), C);
     }
 
     #[test]