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patch 8.2.4634: Vim9: cannot initialize a variable to null_list

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Problem:    Vim9: cannot initialize a variable to null_list.
Solution:   Give negative count to NEWLIST. (closes #10027)
            Also fix inconsistencies in comparing with null values.
This commit is contained in:
Bram Moolenaar
2022-03-27 16:29:53 +01:00
parent c75bca3ee9
commit ec15b1cfdc
12 changed files with 179 additions and 84 deletions
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17
src/evalvars.c
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@@ -2816,11 +2816,13 @@ eval_variable(
type = sv->sv_type;
}
// If a list or dict variable wasn't initialized, do it now.
// Not for global variables, they are not declared.
// If a list or dict variable wasn't initialized and has meaningful
// type, do it now. Not for global variables, they are not
// declared.
if (ht != &globvarht)
{
if (tv->v_type == VAR_DICT && tv->vval.v_dict == NULL)
if (tv->v_type == VAR_DICT && tv->vval.v_dict == NULL
&& type != NULL && type != &t_dict_empty)
{
tv->vval.v_dict = dict_alloc();
if (tv->vval.v_dict != NULL)
@@ -2829,7 +2831,8 @@ eval_variable(
tv->vval.v_dict->dv_type = alloc_type(type);
}
}
else if (tv->v_type == VAR_LIST && tv->vval.v_list == NULL)
else if (tv->v_type == VAR_LIST && tv->vval.v_list == NULL
&& type != NULL && type != &t_list_empty)
{
tv->vval.v_list = list_alloc();
if (tv->vval.v_list != NULL)
@@ -2838,12 +2841,6 @@ eval_variable(
tv->vval.v_list->lv_type = alloc_type(type);
}
}
else if (tv->v_type == VAR_BLOB && tv->vval.v_blob == NULL)
{
tv->vval.v_blob = blob_alloc();
if (tv->vval.v_blob != NULL)
++tv->vval.v_blob->bv_refcount;
}
}
copy_tv(tv, rettv);
}