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patch 8.2.4287: cannot assign empty list with type to variable with list type

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Problem:    Cannot assign empty list with any list type to variable with
            specific list type.
Solution:   Use unknown list type for empty list if the specified type is any.
This commit is contained in:
Bram Moolenaar
2022-02-03 12:34:05 +00:00
parent 381692b6f1
commit 2d3ac2e030
4 changed files with 19 additions and 4 deletions
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6
src/vim9type.c
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@@ -344,7 +344,11 @@ typval2type_int(typval_T *tv, int copyID, garray_T *type_gap, int flags)
list_T *l = tv->vval.v_list;
listitem_T *li;
if (l == NULL || (l->lv_first == NULL && l->lv_type == NULL))
// An empty list has type list<unknown>, unless the type was specified
// and is not list<any>. This matters when assigning to a variable
// with a specific list type.
if (l == NULL || (l->lv_first == NULL
&& (l->lv_type == NULL || l->lv_type->tt_member == &t_any)))
return &t_list_empty;
if ((flags & TVTT_DO_MEMBER) == 0)
return &t_list_any;