patch 8.2.1824: Vim9: variables at the script level escape their scope
Problem: Vim9: variables at the script level escape their scope.
Solution: When leaving a scope remove variables declared in it.
diff --git a/src/proto/evalvars.pro b/src/proto/evalvars.pro
index 520fedd..39ea338 100644
--- a/src/proto/evalvars.pro
+++ b/src/proto/evalvars.pro
@@ -67,6 +67,7 @@
void unref_var_dict(dict_T *dict);
void vars_clear(hashtab_T *ht);
void vars_clear_ext(hashtab_T *ht, int free_val);
+void delete_var(hashtab_T *ht, hashitem_T *hi);
void set_var(char_u *name, typval_T *tv, int copy);
void set_var_const(char_u *name, type_T *type, typval_T *tv_arg, int copy, int flags);
int var_check_ro(int flags, char_u *name, int use_gettext);