gistfile1.txt

diff --git a/src/frame/plane.rs b/src/frame/plane.rs
index 71555c42..30f0c020 100644
--- a/src/frame/plane.rs
+++ b/src/frame/plane.rs
@@ -665,6 +665,39 @@ pub mod test {
     assert_eq!(&input[..64], &plane.data[..64]);
   }
 
+  #[test]
+  fn mutable_access() {
+    let mut plane = Plane::<u8> {
+      data: PlaneData::from_slice(&vec![
+        0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 1, 2, 3, 4, 0, 0,
+        0, 0, 8, 7, 6, 5, 0, 0,
+        0, 0, 9, 8, 7, 6, 0, 0,
+        0, 0, 2, 3, 4, 5, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0,
+      ]),
+      cfg: PlaneConfig {
+        stride: 8,
+        alloc_height: 9,
+        width: 4,
+        height: 4,
+        xdec: 0,
+        ydec: 0,
+        xpad: 0,
+        ypad: 0,
+        xorigin: 2,
+        yorigin: 3,
+      },
+    };
+    let mut s = plane.as_mut_slice();
+
+    s[1][2] = 42;
+
+  }
+
   #[test]
   fn test_plane_pad() {
     let mut plane = Plane::<u8> {