message: testcase fix
diff: @@ -84,7 +84,7 @@ def test03_failures(pkg):
  ek.enable_grad(v)
  with pytest.raises(ek.Exception) as e:
  p.Loop(i, v)
  - assert 'Encountered a differentiable array with enabled gradients! This is not supported.' in str(e.value)
  + assert 'Symbolic loop encountered a differentiable array with enabled gradients! This is not supported.' in str(e.value)
  @pytest.mark.parametrize("pkg", pkgs)
  