Adding a null list to a list causes problems with echo

[Yegappan Lakshmanan]

Hi,

When a null list (test_null_list()) is added to a list, then echoing the

list doesn't produce any output:

  :let l = [1, 2, test_null_list()]

  :echo l

  :echo string(l)

But echoing the first two list elements works:

  :echo l[:1]

  [1, 2]

- Yegappan

[Bram Moolenaar]

Another case where a NULL list isn't handled like an empty list.
I'll fix it.

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[Yegappan Lakshmanan]

Hi Bram,

On Wed, Apr 22, 2020 at 10:14 AM Bram Moolenaar <Br...@moolenaar.net> wrote:

Yegappan wrote:

> When a null list (test_null_list()) is added to a list, then echoing the
> list doesn't produce any output:
>
>   :let l = [1, 2, test_null_list()]
>   :echo l
>   :echo string(l)
>
> But echoing the first two list elements works:
>
>   :echo l[:1]
>   [1, 2]

Another case where a NULL list isn't handled like an empty list.
I'll fix it.

Thanks for the fix. That works. A similar problem exists for the null Dict.

After making the change for a null Dict, I see that comparing a null

Dict against an empty Dict returns False.

  :echo {} == test_null_dict()

  0

  :echo [] == test_null_list()

  1

  :echo "" == test_null_string()

  1

  :echo 0z == test_null_blob()

  1

- Yegappan