patch 8.2.2157: Vim9: can delete a Vim9 script variable from a function
Problem: Vim9: can delete a Vim9 script variable from a function.
Solution: Check the variable is defined in Vim9 script. (closes #7483)
diff --git a/src/evalvars.c b/src/evalvars.c
index 9e11578..fde80d7 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -1663,10 +1663,20 @@
dict_T *d;
dictitem_T *di;
+ // can't :unlet a script variable in Vim9 script
if (in_vim9script() && check_vim9_unlet(name) == FAIL)
return FAIL;
ht = find_var_ht(name, &varname);
+
+ // can't :unlet a script variable in Vim9 script from a function
+ if (ht == get_script_local_ht()
+ && SCRIPT_ID_VALID(current_sctx.sc_sid)
+ && SCRIPT_ITEM(current_sctx.sc_sid)->sn_version
+ == SCRIPT_VERSION_VIM9
+ && check_vim9_unlet(name) == FAIL)
+ return FAIL;
+
if (ht != NULL && *varname != NUL)
{
d = get_current_funccal_dict(ht);