1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/tuple-index.rs b/tests/ui/tuple-index.rs
new file mode 100644
index 00000000000..3e1d92b42aa
--- /dev/null
+++ b/tests/ui/tuple-index.rs
@@ -0,0 +1,32 @@
+// run-pass
+
+struct Point(isize, isize);
+
+fn main() {
+    let mut x = Point(3, 2);
+    assert_eq!(x.0, 3);
+    assert_eq!(x.1, 2);
+    x.0 += 5;
+    assert_eq!(x.0, 8);
+    {
+        let ry = &mut x.1;
+        *ry -= 2;
+        x.0 += 3;
+        assert_eq!(x.0, 11);
+    }
+    assert_eq!(x.1, 0);
+
+    let mut x = (3, 2);
+    assert_eq!(x.0, 3);
+    assert_eq!(x.1, 2);
+    x.0 += 5;
+    assert_eq!(x.0, 8);
+    {
+        let ry = &mut x.1;
+        *ry -= 2;
+        x.0 += 3;
+        assert_eq!(x.0, 11);
+    }
+    assert_eq!(x.1, 0);
+
+}