1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/rfcs/rfc-1789-as-cell/from-mut.rs b/tests/ui/rfcs/rfc-1789-as-cell/from-mut.rs
new file mode 100644
index 000000000..329fadb15
--- /dev/null
+++ b/tests/ui/rfcs/rfc-1789-as-cell/from-mut.rs
@@ -0,0 +1,20 @@
+// run-pass
+
+#![feature(as_array_of_cells)]
+
+use std::cell::Cell;
+
+fn main() {
+    let slice: &mut [i32] = &mut [1, 2, 3];
+    let cell_slice: &Cell<[i32]> = Cell::from_mut(slice);
+    let slice_cell: &[Cell<i32>] = cell_slice.as_slice_of_cells();
+
+    assert_eq!(slice_cell.len(), 3);
+
+    let mut array: [i32; 3] = [1, 2, 3];
+    let cell_array: &Cell<[i32; 3]> = Cell::from_mut(&mut array);
+    let array_cell: &[Cell<i32>; 3] = cell_array.as_array_of_cells();
+
+    array_cell[0].set(99);
+    assert_eq!(array, [99, 2, 3]);
+}