diff --git a/test/unit/test_disk_tensor.py b/test/unit/test_disk_tensor.py
index 5f210175f8..9b0aed2b0b 100644
--- a/test/unit/test_disk_tensor.py
+++ b/test/unit/test_disk_tensor.py
@@ -433,17 +433,15 @@ class TestDiskTensorMovement(unittest.TestCase):
     t = Tensor(self.fn)
     self.assertListEqual(t[16:18].tolist(), [16,17])
 
-  # TODO: fix this! at least assert on it
-  @unittest.expectedFailure
   def test_slice_read_cat(self):
     t = Tensor(self.fn)
-    self.assertListEqual(Tensor.cat(t[16:18], t[20:22]).tolist(), [16,17,20,21])
+    with self.assertRaises(AssertionError):
+      self.assertListEqual(Tensor.cat(t[16:18], t[20:22]).tolist(), [16,17,20,21])
 
-  # TODO: fix this! at least assert on it
-  @unittest.expectedFailure
   def test_slice_sum(self):
     t = Tensor(self.fn)
-    self.assertListEqual((t[16:18]+t[20:22]).tolist(), [16+20,17+21])
+    with self.assertRaises(AssertionError):
+      self.assertListEqual((t[16:18]+t[20:22]).tolist(), [16+20,17+21])
 
 if __name__ == "__main__":
   unittest.main()
diff --git a/tinygrad/schedule/rangeify.py b/tinygrad/schedule/rangeify.py
index 2ce45af401..581862570c 100644
--- a/tinygrad/schedule/rangeify.py
+++ b/tinygrad/schedule/rangeify.py
@@ -218,7 +218,9 @@ def late_buffer_view(t:UOp, b:UOp):
 
     # walk up for the INDEX
     x = t
-    while not any(u.op is Ops.INDEX for u in x.src): x = x.src[0]
+    while not any(u.op is Ops.INDEX for u in x.src):
+      assert x.op not in GroupOp.Elementwise, "can't buffer view elementwise"
+      x = x.src[0]
     x = next(u for u in x.src if u.op is Ops.INDEX)
 
     if len(shape) == 0: offset = x.src[1].arg