OK, let me make a PR, I found another leak for type:ignore.

On Fri, Feb 1, 2019 at 9:22 AM Pablo Galindo Salgado <report@bugs.python.org>
wrote:

>
> Pablo Galindo Salgado <pablogsal@gmail.com> added the comment:
>
> The extra referenced happen here in Python-ast.c :
>
> value = ast2obj_string(o->type_comment);
>     if (!value) goto failed;
>     if (_PyObject_SetAttrId(result, &PyId_type_comment, value) == -1)
>         goto failed;
>     Py_DECREF(value);
>
> ast2obj_string increments it once and the setattr does it again and then
> there is only one Py_DECREF.
>
> ----------
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> <https://bugs.python.org/issue35879>
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